CN1737625A - Optical add/drop multiplexer - Google Patents

Abstract

Optical add/drop multiplexer.The core cell that is arranged in the transmission path comprises: by the path, be used to make the input signal of input port by arriving output port; Outlet side port (25a) is used to draw the input signal with predetermined wavelength; And inserting side port (25b), be used for inserting channel with predetermined wavelength to input light.

Description

Optical add/drop multiplexer

Technical field

The present invention relates to optical add/drop multiplexer (optical add/drop multiplexer), more particularly, relate to a kind of like this optical add/drop multiplexer, wavelength cross connection (wavelength cross-connect) function and the optics that wherein can expand in the wavelength multiplexing optical transmission system are inserted the branch function.

Background technology

In recent years, along with the increase of the traffic, there is demand to witched-capacity network.In order to satisfy this demand, the optical-fiber network that uses wavelength-division multiplex (WDM) is applied to traditional elemental network.In this optical-fiber network, the needs of wavelength cross connect function and optical add/drop multiplexer (OADM) are increased.By this wavelength cross connect function, change the destination that input light is output at each wavelength of WDM light.For example, in the flat 8-195972 communique of Japanese Patent Application Laid-Open this technology is disclosed.By OADM, the flashlight with any wavelength is inserted free routing, draw then (drop) it.Thus, receive flashlight.OADM comprises wavelength-selective switches (WSS).Have polytype WSS, for example a kind of WSS has the diffraction grating and the matrix switch of use (utilizing MEMS (micro electro mechanical system) (MEMS) technology) MEMS mirror, and a kind of WSS has thin film filter and the matrix switch that uses the MEMS mirror.

The angle of the device of the function from have the wavelength cross connect function and the size of OADM and cost, preferably, make this function to expand on demand, when introducing, design this device as far as possible for a short time simultaneously, and not only make these functions advanced person.When this device being replaced with another when device, must reconnect to another device after the replacing to the optical fiber that is connected to this device.Yet,, need the plenty of time so reconnect because the quantity of optical fiber reaches thousands of.In addition, reconnect the signal that must disconnection transmitting in order to carry out.Therefore, wish to realize a kind of like this structure ((in-service) in service upgrading), that is, it makes can expand described function under the situation that does not disconnect the signal that is transmitting.

Yet, in conventional structure, when will introducing when device, by with future demand number of wavelengths and the quantity that estimates accordingly of switch route quantity be equipped with device.As a result, required device size becomes very big when introducing at first, and the introducing cost of the device when introducing at first increases.

Figure 59 is the transmission path in the network and the synoptic diagram of wavelength cross connection device.Two rings of transmission path A and B are connected to the wavelength cross connection device 1300 that forms optical add/drop multiplexer.Transmission path A comprises two optical fiber 1301a and 1301b, and transmission path B comprises two optical fiber 1302a and 1302b.Wavelength cross connection device 1300 exchanges signal to four circuits of optical fiber 1302b (#1 to #4 four routes) on four direction by optical fiber 1301a totally.More particularly, can be between switching signal: route #1 between the following route and route #2, between route #1 and the route #3, between route #1 and the route #4, between route #2 and the route #3, between route #2 and the route #4, and between route #3 and the route #4.

Figure 60 is the synoptic diagram of the structure of optical cross connect.Followingly the situation of using 80 * 80 matrix switches 1310 (the input quantity of its medium wavelength and output quantity are 80 (λ 1 to λ 80)) is explained as example.If expecting the quantity (transmission path quantity) of final route after introducing device is 4, the quantity of optical fiber that is used to have the signal of a wavelength so is 8 circuits, i.e. " 4 circuit (being used for transmission signals)+4 circuit (concentrate one's gaze on insert when all wavelengths/when drawing)=8 circuits ".Therefore, give a matrix switch 1310 80/8=10 wavelength assignment.

If the route quantity when initial the introducing is 2, then use the input/output end port of 40 circuits that the passing through of matrix switch 1310 " (2 circuit (being used for transmission signals)+2 circuit (being used to insert/draw)) * 10 wavelength " obtain.Other input/output end ports of all the other 40 circuits keep not usefulness, and this wastes very much.If find that the expectation of carrying out is inaccurate and need carry out the function expansion for being higher than the number of routes of estimating quantity when initial the introducing, that possibly can't meet the demands.

Summary of the invention

An object of the present invention is to solve at least the problems referred to above in the routine techniques.

Optical add/drop multiplexer according to one aspect of the invention comprises core cell, this optical add/drop multiplexer is used for switching-over light path changing over output signal at each wavelength having through multiplexing a plurality of wavelength and the input light that is input to input port, and is used to draw or insert the flashlight with predetermined wavelength.This core cell comprises: by path (through path), make input light by arriving output port; Draw port, be used to draw input light with predetermined wavelength; And the insertion port, be used for inserting flashlight to input light.

Other purposes of the present invention, feature and advantage have obtained concrete explaination in following detailed description of the present invention, perhaps therefrom can be obvious when reading in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the synoptic diagram that is used to explain the function expansion of being undertaken by the optical add/drop multiplexer according to the embodiment of the invention;

Fig. 2 is used for the table that the function to optical add/drop multiplexer compares;

Fig. 3 is the synoptic diagram from low counting (count) channel DOADM to the function expansion of high accounting channel DOADM;

Fig. 4 is the synoptic diagram of the function expansion from ROADM to DOADM;

Fig. 5 is the synoptic diagram of the function expansion from DOADM to WXC;

Fig. 6 is the synoptic diagram of the structure of core cell;

Fig. 7 is the synoptic diagram of another structure of core cell;

Fig. 8 is the synoptic diagram of the another structure of core cell;

Fig. 9 is the synoptic diagram of a structure again of core cell;

Figure 10 is the synoptic diagram that inserts the structure of unit;

Figure 11 A is the synoptic diagram that inserts another structure of unit;

Figure 11 B is the synoptic diagram that inserts another structure of unit;

Figure 12 is the synoptic diagram that inserts another structure of unit;

Figure 13 is the synoptic diagram that inserts another structure of unit;

Figure 14 is the synoptic diagram that inserts another structure of unit;

Figure 15 is the synoptic diagram that inserts another structure of unit;

Figure 16 is the synoptic diagram that inserts another structure of unit;

Figure 17 is the synoptic diagram that inserts another structure of unit;

Figure 18 is the synoptic diagram of drawing the structure of unit;

Figure 19 A is the synoptic diagram of drawing another structure of unit;

Figure 19 B is the synoptic diagram of drawing another structure of unit;

Figure 20 is the synoptic diagram of drawing another structure of unit;

Figure 21 is the synoptic diagram of drawing another structure of unit;

Figure 22 is the synoptic diagram of drawing another structure of unit;

Figure 23 is the synoptic diagram of drawing another structure of unit;

Figure 24 is the synoptic diagram of drawing another structure of unit;

Figure 25 is the synoptic diagram of drawing another structure of unit;

Figure 26 is the synoptic diagram that is used to change the core cell of wavelength spacing;

Figure 27 is the synoptic diagram that is used to change the core cell of wavelength spacing;

Figure 28 is the synoptic diagram of drawing the unit that is used to change the wavelength spacing;

Figure 29 is the synoptic diagram that is used to explain the function expansion of core cell;

Figure 30 A is the synoptic diagram of the luminous power control in the core cell;

Figure 30 B is the synoptic diagram of another luminous power control in the core cell;

Figure 31 is the synoptic diagram of another luminous power control in the core cell;

Figure 32 A is the synoptic diagram of another luminous power control in the core cell;

Figure 32 B is the synoptic diagram of another luminous power control in the core cell;

Figure 33 is the synoptic diagram of another luminous power control in the core cell;

Figure 34 A is the synoptic diagram of the structure of the optical add/drop multiplexer when initial the introducing;

Figure 34 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 34 A;

Figure 34 C is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A;

Figure 34 D is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A;

Figure 34 E is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A;

Figure 34 F is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 G is the synoptic diagram that is used to form the grouping light filter shown in Figure 34 F (grouping filter) interleaver (interleaver) (GF);

Figure 34 H is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 I is the synoptic diagram that is used to form the interleaver of the grouping light filter (GF) shown in Figure 34 H;

Figure 34 J is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 L is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 34 J (GF1,3,5) divides light filter (band division filter);

Figure 34 M is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 N is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 34 M (GF2,4,6,8 and 10) divides light filter;

Figure 34 O is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 34 M (GF1,3,5,7 and 9) divides light filter;

Figure 34 P is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 Q is the synoptic diagram that is used to form colourless (colorless) AWG of the grouping light filter (GF1 to 5) shown in Figure 34 P;

Figure 34 R is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E;

Figure 34 S is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 34 R (GF2,4,6,8 and 10);

Figure 34 T is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 34 R (GF1,3,5,7 and 9);

Figure 35 A is the synoptic diagram (upgrading example 2 in service) of the optical add/drop multiplexer when initial the introducing;

Figure 35 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A;

Figure 35 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A;

Figure 35 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A;

Figure 35 E is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 35 C;

Figure 35 F is the synoptic diagram that is used to form the interleaver of the grouping light filter (GF) shown in Figure 34 E;

Figure 35 G is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 35 C;

Figure 35 H is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 35 G (GF2,4,6,8 and 10) divides light filter;

Figure 35 I is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 35 G (GF1,3,5,7 and 9) divides light filter;

Figure 35 J is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 35 C;

Figure 35 K is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 35 J (GF1,3,5,7 and 9);

Figure 35 L is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 35 J (GF2,4,6,8 and 10);

Figure 36 A is the synoptic diagram (upgrading example 3 in service) of the structure of the optical add/drop multiplexer when initial the introducing;

Figure 36 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A;

Figure 36 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A;

Figure 36 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A;

Figure 36 E is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A;

Figure 36 F is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A;

Figure 36 G is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 H is the synoptic diagram that is used to form the interleaver of the grouping light filter (GF) shown in Figure 36 G;

Figure 36 I is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 J is the synoptic diagram that is used to form the interleaver of the grouping light filter (GF) shown in Figure 36 1;

Figure 36 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 L is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 36 K (GF2,4) divides light filter;

Figure 36 M is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 36 K (GF1,3,5) divides light filter;

Figure 36 N is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 O is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 36 N (GF2,4,6,8 and 10) divides light filter;

Figure 36 P is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 36 N (GF1,3,5,7 and 9) divides light filter;

Figure 36 Q is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 R is the synoptic diagram that is used to form the colourless AWG of the grouping light filter (GF1 to 5) shown in Figure 36 Q;

Figure 36 S is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F;

Figure 36 T is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 36 S (GF1,3,5,7 and 9);

Figure 36 U is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 36 S (GF2,4,6,8 and 10);

Figure 37 A is the synoptic diagram (upgrading example 4 in service) of the structure of the optical add/drop multiplexer when initial the introducing;

Figure 37 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A;

Figure 37 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A;

Figure 37 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A;

Figure 37 E is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A;

Figure 37 F is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D;

Figure 37 G is the synoptic diagram that is used to form the interleaver of the grouping light filter (GF) shown in Figure 37 F;

Figure 37 H is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D;

Figure 37 I is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 37 H (GF2,4,6,8 and 10) divides light filter;

Figure 37 J is the synoptic diagram that the band that is used to form the grouping light filter shown in Figure 37 H (GF1,3,5,7 and 9) divides light filter;

Figure 37 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D;

Figure 37 L is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 37 K (GF1,3,5,7 and 9);

Figure 37 M is the synoptic diagram that is used to form the colourless AWG of the grouping light filter shown in Figure 37 K (GF2,4,6,8 and 10);

Figure 38 A is the synoptic diagram (upgrading example 5 in service) of the structure of the optical add/drop multiplexer when initial the introducing;

Figure 38 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 38 A;

Figure 38 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 38 A;

Figure 39 A is the synoptic diagram (upgrading example 6 in service) of the structure of the optical add/drop multiplexer when initial the introducing;

Figure 39 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 39 A;

Figure 39 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 39 A;

The synoptic diagram of the signal exchange that Figure 39 D carries out between many transmission paths when being the expansion that is used to be illustrated in shown in the execution graph 39C;

Figure 40 A is the synoptic diagram of the structure when using interleaver as the grouping light filter at outlet side;

Figure 40 B is the synoptic diagram of the structure when using interleaver as the grouping light filter in the inserting side;

Figure 41 A is the synoptic diagram of the structure when using band to divide light filter as the grouping light filter at outlet side;

Figure 41 B is the synoptic diagram of the structure when using band to divide light filter as the grouping light filter in the inserting side;

Figure 42 A is the synoptic diagram of the structure when using colourless AWG as the grouping light filter at outlet side;

Figure 42 B is the synoptic diagram of the structure when using colourless AWG as the grouping light filter in the inserting side;

Figure 43 A is the synoptic diagram of structure that wherein the spectrum monitoring device is used to draw the luminous power control of signal;

Figure 43 B is the synoptic diagram that wherein the spectrum monitoring device is used for the main signal and the structure of the luminous power control of drawing signal;

Figure 44 is the synoptic diagram that is used to explain the expansion of the core cell that comprises interleaver;

Figure 45 A is the synoptic diagram of the wavelength-selective switches that is positioned at outlet side of discrete one-tenth piece;

Figure 45 B is the synoptic diagram of the wavelength-selective switches that is positioned at the inserting side of discrete one-tenth piece;

Figure 46 A is the synoptic diagram that is used to realize the optical add/drop multiplexer according to an embodiment of the invention of wavelength cross connect function;

Figure 46 B be used to insert unit, unit/draw channel quantity and be used for the figure of the relation between the maximum quantity of the cross-coupled route of wavelength;

Figure 47 is used to explain the synoptic diagram to the port expansion of the route of optical add/drop multiplexer shown in Figure 46 A;

Figure 48 is used to explain the synoptic diagram to the another port expansion of the route of optical add/drop multiplexer shown in Figure 46 A;

Figure 49 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is inserted core cell;

Figure 50 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is inserted core cell;

Figure 51 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is inserted core cell;

Figure 52 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when using 1 * 6 photo-coupler at outlet side;

Figure 53 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when using 1 * 6 photo-coupler at outlet side;

Figure 54 is the synoptic diagram that is used to explain when the outlet side at core cell uses 1 * 6 photo-coupler the port expansion of the route of optical add/drop multiplexer;

Figure 55 is used to explain the synoptic diagram to the port expansion of route based on ROADM;

Figure 56 is used to explain the synoptic diagram to the port expansion of route based on ROADM;

Figure 57 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is inserted core cell;

Figure 58 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is inserted core cell;

Figure 59 is the synoptic diagram of the structure of transmission path in the network and wavelength cross connection device; And

Figure 60 is the synoptic diagram of the structure of optical cross connect.

Embodiment

Followingly a plurality of exemplary embodiments of the present invention are described in detail with reference to accompanying drawing.

Recently, replace matrix switch, wavelength-selective switches and wavelength separator (blocker) have been carried out active research and exploitation.Wavelength-selective switches can be used for going up in any direction to random wave progress row switch, and wavelength separator can be opened any wavelength and any wavelength obstruct.These devices have such advantage, and are low as compact dimensions, cost, to insert loss number of fibers low and that need when mounted little.

Wavelength-selective switches or wavelength separator are used for optical add/drop multiplexer according to an embodiment of the invention.Function is expanded to support multi-wavelength (HCC: DOADM high accounting channel) from the dynamic OADM (DOADM) that supports small echo long number (LCC: hang down accounting channel).In addition, function is expanded to wavelength cross connection (WXC).Can under the situation that does not disconnect transmission signals, realize the function expansion thus.

Fig. 1 is the synoptic diagram that is used to explain the function expansion of being undertaken by optical add/drop multiplexer according to an embodiment of the invention.Wherein show such function expansion (upgrading in service) example, that is,, the function of optical add/drop multiplexer is expanded to high accounting channel (HCC) DOADM from low accounting channel (LCC) DOADM, expand to WXC then according to the variation of network demand.

When initial the introducing, be that looped network lattice (metro ring (metro ring) 1a) have been arranged DOADM 2a.This is based on such expectation,, possibly loop network is expanded to three loop network 1a after 5 years to 1c that is.

Insert/draw requirement owing to when initial the introducing, only some wavelength is existed, so arranged low accounting channel (LCC) DOADM 2a with essential minimum function.As shown in Figure 1,3a represents " insertion " unit, and 3b represents " drawing " unit.The DOADM 2a that arranges when initial the introducing has expandable structure, to support the anticipation network demand after 5 years.

With reference to " after 2 years ", for example, expect the increase of the required number of wavelengths among loop network 1a of this structural support.DOADM 2b uses the available port that inserts unit 3a and draw unit 3b.Alternatively, insert/draw module, in operational process, under the situation that does not disconnect transmission signals, function is expanded to high accounting channel (HCC) DOADM 2b by adding to available port.

With reference to " after 5 years ", for example, under the situation that does not disconnect existing transmission signals, function is expanded to wavelength cross connection (WXC) 2c from DOADM 2b, so that can communicate between the 1c to three corresponding respectively loop network 1a of metro ring #3 with metro ring #1.Change presentation function from DOADM 2b to WXC 2c is expanded but not the device exchange.By the function expansion, title becomes WXC 2c from DOADM 2b.WXC 2c allows to carry out the function of wavelength cross connection device in transmission path.

Fig. 2 is used for the table that the function to optical add/drop multiplexer compares mutually.This Figure illustrates following topology example: have or lack the function that is used for inserting/drawing any wavelength, and allow or forbid being reconstructed among OADM, ROADM (restructural OADM), DOADM and the limited wavelength DOADM each at arbitrary port.Fig. 1 explains as reference, by using DOADM, can be provided with in the future and insert/draw the function of any wavelength at arbitrary port, and also can be reconstructed.

With reference to function expansion of the present invention, can also use any structure example except that OADM, that is, and ROADM and limited wavelength DOADM.Adopt ROADM, can be reconstructed.In the DOADM of limited wavelength, to compare with DOADM, the function of inserting/draw any wavelength at arbitrary port is restricted aspect wavelength, but can be reconstructed by the mode identical with DOADM.If there is the small echo long number that is inserted into or draws, can use the limited wavelength DOADM that obtains with the cost lower so than DOADM.

Fig. 3 is the synoptic diagram of the function expansion in each optical add/drop multiplexer to Fig. 5.As shown in the figure, optical add/drop multiplexer comprises core cell, and this core cell comprises: wavelength-selective switches or wavelength separator; Draw the unit, be used for drawing flashlight it is guided to the output port (drawing port) that is used to draw from core cell; And the insertion unit, be used for exporting the flashlight that is inserted into core cell from the input port (insertion port) that is used to insert.

Fig. 3 is the synoptic diagram of the function expansion from low accounting channel DOADM to high accounting channel DOADM.On transmission path, N wavelength carried out multiplexing input signal by core cell 11a and be output.Core cell 11a comprises wavelength-selective switches (WSS) or wavelength separator (WB), and makes that drawing unit 12a draws the signal with predetermined wavelength.In addition, core cell 11a from the signal multiplexing that inserts unit 13a on main signal.

In low accounting channel (LCC) DOADM 10a, port " i " input of the wavelength " i " of the signal that the port " i " by drawing unit 12a is drawn from core cell 11a to receiver (Rx) output by inserting unit 13a be from the signal of transmitter (Tx), and be inserted among the core cell 11a.Although it is identical with the quantity of the port i that inserts unit 13a to draw the quantity of port i of unit 12a, they can be different.

(during port number i＜k), former state is used core cell 11a, and uses the available port of drawing unit 12a and inserting unit 13a that port number is increased to k when function being expanded to high accounting channel (HCC) DOADM 10b and number of wavelengths being increased to k from i.In addition, also another is drawn the unit and add available port to insertion unit (not shown).By this interpolation, can expand to high accounting channel DOADM 10b to function.

Fig. 4 is the synoptic diagram of the function expansion from ROADM to DOADM.In ROADM 20a, the port of drawing unit 22a and insertion unit 23a that is connected to core cell 21a is only corresponding to a plurality of fixed wave length of determining when introducing at first respectively (λ 1 to λ n).When function is expanded to DOADM 20b, former state is used core cell 21a under situation about not changing, but be replaced with and draw unit 22b drawing unit 22a, be replaced with and insert unit 23b inserting unit 23a, wherein the port in each is all corresponding to any wavelength.Each of drawing among unit 22b and the insertion unit 23b all comprises photoswitch or light filter, and can be that each port is selected any one wavelength (wavelength among λ 1 to the λ n) among wavelength X 1 to λ n.Select by this, can under the situation of the signal in the transmission path in not disconnecting core cell 21a, expand function.

Fig. 5 is the synoptic diagram of the function expansion from DOADM to WXC, and shows the example that the function of the DOADM 20b of Fig. 4 is expanded to WXC 20c.Core cell 21a comprises outlet side port 25a and inserting side port 25b.According to network demand, with the additional accordingly core cell 21a that is provided with of the increase of transmission path quantity.In the example of Fig. 5, route quantity (transmission path quantity) is increased to 3 from 1, and correspondingly adds core cell 21b and core cell 21c.

Although omitted from the WXC 20c of Fig. 5 and to have drawn the unit and to insert the unit, in DOADM 20b, describe draw unit 22b and insertion unit 23b is connected to core cell 21a, 21b and 21c.The port of the outlet side port 25a that is provided with in core cell 21a, 21b and 21c and the port of inserting side port 25b interconnect in the inside of WXC 20c.

The outlet side port 25a of core cell 21a is connected to the inserting side port 25b of core cell 21b and is connected to the inserting side port 25b of core cell 21c.The outlet side port 25a of core cell 21b is connected to the inserting side port 25b of core cell 21a and is connected to the inserting side port 25b of core cell 21c.In addition, the outlet side port 25a of core cell 21c is connected to the inserting side port 25b of core cell 21a and is connected to the inserting side port 25b of core cell 21b.

Connect example by these, as reference Fig. 1 explains, can expand function accordingly with the route quantity in three metro rings (#1 is to #3).Therefore, can under the situation of the main signal of constantly opening core cell, expand, with the quantity of the core cell that increase to form WXC 20c and increase route quantity function.

Followingly to Fig. 9 the various topology examples of core cell are explained with reference to Fig. 6.Fig. 6 is the figure of the topology example 1 of core cell.Core cell 30 as shown in Figure 6 comprises core 1 (30a) and core 2 (30b).Core 1 (30a) comprising: 1 * 2 (below, input quantity and output schedule of quantities are shown as " input quantity * output quantity ") photo-coupler 31; Wavelength separator (WB) 32 is connected in a plurality of outputs of photo-coupler 31; And 2 * 1 photo-couplers 33, an one input is connected to the output of wavelength separator 32.Core 2 (30b) comprising: the 1 * N-port wavelength-selective switches (WSS) 34 that is used to draw is connected to other outputs of photo-coupler 31; With the M that is used to insert * 1-port wavelength-selective switches (WSS) 35, be connected to other outputs of photo-coupler 33.

Many inputs and single output optical coupler are coupled together a plurality of flashlights of input, and export them as reuse wavelengths.Single input and many output optical couplers are drawn the multiplexed signals light of input same as before, and output signal light.Many inputs and single output wavelength selector switch are multiplexing to a plurality of random wave progress row of input, single input and many output wavelengths selector switch go out to have the long flashlight of random wave from the multiplexed signals light demultiplexing of input, and export this flashlight (, then exporting N wavelength) if there is N output.Therefore, when signal by photo-coupler and when being drawn, draw through multiplexing whole flashlight, this cause with wavelength-selective switches mutually specific damping increased.Image intensifer etc. is set prevents decay to take measures.

Wavelength-selective switches (not shown) such as (WSS) is also connected to be arranged in and draws the unit and insert wavelength-selective switches 34 in the unit and 35 port.According to this connection, can expand to high accounting channel DOADM to function from low accounting channel DOADM.In addition,, function is expanded to WXC by these wavelength-selective switches are combined mutually, this make can be under the situation that does not increase equipment size suppression loss.As shown in Figure 6, the number of fibers that connect between the assembly in the core cell 30 is less, and this makes to carry out easily and connects.In addition, even in the process of system's operation, also can under the situation that needn't reconnect optical fiber and disconnection main signal, expand function.In addition, can realize " draw and continue " function, this function is used for when transmitting certain wavelength as main signal to the outlet side transmission wavelength signals identical with main signal.

Fig. 7 is the synoptic diagram of another structure of core cell.The core cell 30 of Fig. 7 comprises: 1 * 2 photo-coupler 41; M * 1-port wavelength-selective switches (WSS) 42 is connected to an output of photo-coupler 41; And the 1 * N-port wavelength-selective switches (WSS) 43 that is used to draw, be connected to other outputs of photo-coupler 41.

Wavelength-selective switches and (not shown) such as grouping light filter etc. are also connected to a plurality of ports of the wavelength-selective switches 43 that is used to draw, and (not shown) such as photo-coupler is connected to the insertion unit.According to this connection, function is expanded to high accounting channel DOADM from low accounting channel DOADM.In addition,, function is expanded to WXC by these wavelength-selective switches are combined mutually, this make can be under the situation that does not increase equipment size suppression loss.As shown in Figure 7, the number of fibers that connect between the assembly in the core cell 30 is less, and this makes to carry out easily and connects.In addition, even in the process of system's operation, also can under the situation that needn't reconnect optical fiber and disconnection main signal, expand function.In addition, can realize drawing and continue function, this function is used for when transmitting certain wavelength as main signal also to the outlet side transmission wavelength identical with main signal.

Fig. 8 is the synoptic diagram of the another structure of core cell.The core cell 30 of Fig. 8 comprises: 1 * N-port wavelength-selective switches (WSS) 51; 2 * 1 photo-couplers 52, in its a plurality of inputs one is connected in a plurality of output ports of wavelength-selective switches 51; And the M that is used to insert * 1-port wavelength-selective switches (WSS) 53, be connected to an input of photo-coupler 52.

Wavelength-selective switches and (not shown) such as grouping light filter etc. are also connected to a plurality of ports of the wavelength-selective switches 51 that is used to draw, and (not shown) such as photo-coupler is connected to the insertion unit.According to this connection, can expand to high accounting channel DOADM to function from low accounting channel DOADM.In addition,, function is expanded to WXC by these wavelength-selective switches are combined mutually, this make can be under the situation that does not increase equipment size suppression loss.As shown in Figure 8, the number of fibers that connect between the assembly in the core cell 30 is less, and this makes to carry out easily and connects.In addition, even in the process of system's operation, also can under the situation that needn't reconnect optical fiber and disconnection main signal, expand function.

Fig. 9 is the synoptic diagram of a structure again of core cell.The core cell 30 of Fig. 9 comprises: 1 * N-port wavelength-selective switches (WSS) 61; And M * 1-port wavelength-selective switches (WSS) 62, in its a plurality of input ports one is connected in a plurality of output ports of wavelength-selective switches 61.

(not shown) such as wavelength-selective switches, grouping light filter, photo-coupler are also connected to be arranged in and draw the unit and insert wavelength-selective switches 61 in the unit and 62 port.According to this connection, function is expanded to high accounting channel DOADM from low accounting channel DOADM.In addition,, function is expanded to WXC by these wavelength-selective switches are combined mutually, this make can be under the situation that does not increase equipment size suppression loss.As shown in Figure 9, the number of fibers that connect between the assembly in the core cell 30 is less, and this makes to carry out easily and connects.In addition, even in the process of system's operation, also can under the situation that needn't reconnect optical fiber and disconnection main signal, expand function.

Followingly to Figure 17 the various topology examples that insert the unit are explained with reference to Figure 10.Figure 10 is the synoptic diagram that inserts the structure of unit.The insertion unit 70 of Figure 10 comprises the optical multiplexer 71 that is used for fixing wavelength.When using optical multiplexer 71, can expand to reconfigurable OADM (ROADM) to function, this is because the input port (1 to M) that is arranged in the optical multiplexer 71 is supported fixed wave length.Insert the inserting side port (seeing that Fig. 6 is to Fig. 9) that unit 70 is connected to core cell 30, the part in a plurality of input ports of optical multiplexer 71 is used to receive, and its another part is used for WXC.Thereby function is expanded to the ROADM that comprises WXC.The insertion unit 70 of Figure 10 is connected to the inserting side port of core cell 30, and this allows with the simply constructed OADM of low cost.

Figure 11 A is the synoptic diagram that inserts another structure of unit.Insert unit 70 and comprise M * 1-port wavelength-selective switches (WSS) 81.Figure 11 B is the synoptic diagram that inserts another structure of unit.In the example shown in Figure 11 B, be provided with a plurality of (in the example of Figure 11 B being two) M * 1-port wavelength-selective switches 81 (each all is the basic structure shown in Figure 11 A), respectively a plurality of outputs of wavelength-selective switches 81 are connected to a plurality of inputs of 2 * 1 photo-couplers 82.

Setting has the photo-coupler 82 of structure shown in Figure 11 B to increase the channel quantity that inserts unit 70.This topology example allows to realize the DOADM of random wave long type.These insert the inserting side port (seeing that Fig. 6 is to Fig. 9) that unit 70 is connected to core cell 30, and this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.According to this structure, can easily be connected to the inserting side port of core cell 30, and can have the signal of any wavelength to each inserting side port transmission of core cell 30 with inserting unit 70.

Figure 12 is the synoptic diagram that inserts another structure of unit.Insert unit 70 and comprise M * 1 photo-coupler 91.If be necessary, can be provided for the image intensifer 92 that the output of photo-coupler 91 is amplified.This insertion unit 70 allows to realize the DOADM of random wave long type, and is connected to the inserting side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, and this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.By inserting the inserting side port that unit 70 is connected to core cell 30, can be by the simply constructed OADM of low cost.

Figure 13 is the synoptic diagram that inserts another structure of unit.Inserting unit 70 comprises M * Metzler matrix switch 96 and is used for multiplexing optical multiplexer 97 is carried out in the input from M port.If be necessary, can be provided for the image intensifer 98 that the output of optical multiplexer 97 is amplified.This set allows the DOADM of structure random wave long type.This insertion unit 70 is connected to the inserting side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, and this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.Be connected to the inserting side port of core cell 30 by the matrix switch 96 that will have required wavelength port number, can have the signal of any wavelength to each inserting side port transmission.In the case, even untapped certain port when being included in initial introducing also needn't be equipped with a plurality of matrix switches.

Figure 14 is the synoptic diagram that inserts the structure of unit to Figure 17.The filter applications of will dividing into groups is inserted the unit in each.Can realize this grouping light filter by using the wave filter that relatively easily produces.This grouping light filter is connected to the inserting side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, and this permission expands to DOADM with function in a simple manner with low cost.

Figure 14 is the synoptic diagram that inserts another structure of unit.Insert unit 100 and comprise M * 1 grouping light filter 101.According to this structure, a plurality of ports of grouping light filter 101 are corresponding to a plurality of assignment wavelength, to realize limited wavelength DOADM.

Figure 15 is the synoptic diagram that inserts another structure of unit.Insert unit 100 and comprise the interleaver (IL) 102 that serves as M * 1 grouping light filter.After a while the inner structure of interleaver 102 is carried out explained in detail.One by one input in this M port each assignment for wavelength in the wavelength of each port in M the port of interleaver 102, and M signal with input wavelength carried out multiplexing and export them.

Figure 16 is the synoptic diagram that inserts another structure of unit.Insert unit 100 and comprise that the band that serves as M * 1 grouping light filter divides light filter (BDF) 103.Divide the inner structure of light filter 103 to carry out explained in detail to band after a while.One by one input in this M port each assignment for wavelength in the wavelength of each port in M the port that band divides light filter 103, and M signal with input wavelength carried out multiplexing and export them.

Figure 17 is the synoptic diagram that inserts another structure of unit.Insert unit 100 and comprise the colourless AWG (colourless array waveguide grating) 104 that serves as M * 1 grouping light filter.Design colourless AWG 104 by the cyclophysis that uses AWG, it distributes to different output ports to the light signal with reuse wavelengths that is input to input port according to each wavelength.One by one input in this M port each assignment for wavelength in the wavelength of each port in M the port of colourless AWG 104, and M signal with input wavelength carried out multiplexing and export them.The specific product of colourless AWG 104 is the AWG router that NEL makes.Compare with other system, colourless AWG has higher flexible design degree, and can realize that compact size and low cost are (referring to " PressRelease " [online], March 20th, 2003, NTT Electronics Corp., [Search:July 15th, 2004], Internet＜URL:http: //www.nel.co.jp/new/information/2003_03_20.html＞).

Followingly to Figure 25 the various topology examples of drawing the unit are explained with reference to Figure 18.Figure 18 is the synoptic diagram of drawing the structure of unit.The unit 110 of drawing of Figure 18 comprises the optics demultiplexer 111 that is used for fixing wavelength, and this optics demultiplexer 111 has N output port.When using optics demultiplexer 111, can expand to limited wavelength DOADM to function, this is because the output port that is arranged in the optics demultiplexer 111 is supported fixed wave length.Draw unit 110 and be connected to the outlet side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, a part of port of optics demultiplexer 111 is used to transmit, and its another part port is used for WXC.Thereby function is expanded to the ROADM that comprises WXC.Figure 18 draws the outlet side port that unit 110 is connected to core cell 30, and this allows with the simply constructed OADM of low cost.

Figure 19 A is the synoptic diagram of drawing another structure of unit.The unit 110 of drawing of Figure 19 A comprises 1 * N-port wavelength-selective switches (WSS) 121.Figure 19 B is the synoptic diagram of drawing another structure of unit.In the example shown in Figure 19 B, be provided with a plurality of (being two among the figure) 1 * N-port wavelength-selective switches (WSS) 121 (each all is the basic structure shown in Figure 19 A), be connected to a plurality of ports of the input side of these wavelength-selective switches 121 with a plurality of outputs 1 * 2 photo-coupler 122.

The photo-coupler 122 that setting has a structure shown in Figure 19 B is drawn the channel quantity of unit 110 with increase.This topology example allows to realize the DOADM of random wave long type.These draw the outlet side port (seeing that Fig. 6 is to Fig. 9) that unit 110 is connected to core cell 30, and this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.According to this structure, can easily be connected to the outlet side port of core cell 30, and can have the signal of any wavelength to each outlet side port transmission of core cell 30 with drawing unit 110.

Figure 20 is the synoptic diagram of drawing another structure of unit.Draw a plurality of variable wavelength filters 132 that unit 110 comprises 1 * N photo-coupler 131 and is connected to N output port of photo-coupler 131.If be necessary, image intensifer 133 can be set at the input side of photo-coupler 131.This set allows to realize the DOADM of random wave long type.Draw unit 110 and be connected to the outlet side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.Be connected to the outlet side port of core cell 30 by drawing unit 110, can be by the simply constructed OADM of low cost.

Figure 21 is the synoptic diagram of drawing another structure of unit.Draw unit 110 and comprise optics demultiplexer 141 and N * N matrix switch 142 with N output port.If be necessary, image intensifer 143 can be set at the input side of optics demultiplexer 141.This set allows to realize the DOADM of random wave long type.Draw unit 110 and be connected to the outlet side port (seeing that Fig. 6 is to Fig. 9) of core cell 30, this makes and can expand to high accounting channel DOADM to function from low accounting channel DOADM.Be connected to the outlet side port of core cell 30 by the matrix switch 142 that will have required wavelength port number, can have the signal of any wavelength to each outlet side port transmission.In the case, even untapped certain port when being included in initial introducing also needn't be equipped with a plurality of matrix switches.

Figure 22 is that wherein each all uses a plurality of topology examples of grouping light filter in drawing the unit to Figure 25.Figure 22 is the synoptic diagram of drawing another structure of unit.Draw unit 150 and comprise 1 * N grouping light filter 151.According to this structure, a plurality of ports of grouping light filter 151 are corresponding to the wavelength of a plurality of assignments, to realize limited wavelength DOADM.

Figure 23 is the synoptic diagram of drawing another structure of unit.Draw unit 150 and comprise the interleaver 152 that serves as 1 * N grouping light filter.After a while the inner structure of interleaver 152 is carried out explained in detail.The wavelength of drawing signal in the wavelength of N the port of interleaver 152 by assignment being given interleaver one by one distribute in this N port each realize drawing the function of unit.

Figure 24 is the synoptic diagram of drawing another structure of unit.Draw unit 150 and comprise that the band that serves as 1 * N grouping light filter divides light filter (BDF) 153.Divide the inner structure of light filter 153 to carry out explained in detail to band after a while.Band divide that the wavelength of drawing signal in the wavelength of N the port of light filter 153 by assignment being given band and dividing light filter one by one distributes in this N port each realize drawing the function of unit.

Figure 25 is the synoptic diagram of drawing another structure of unit.Draw unit 150 and comprise the colourless AWG 154 that serves as 1 * N grouping light filter.The wavelength of drawing signal in the wavelength of N the port of colourless AWG 154 by assignment being given colourless AWG one by one distribute in this N port each realize drawing the function of unit.

Figure 26 is the synoptic diagram that is used to change the core cell of wavelength spacing.Core cell 160 comprises: BHz/2BHz input side interleaver 161; Two 1 * 2 photo-coupler 162a and 162b are connected to interleaver 161; Two 1 * N-port 2BHz spacing wavelength-selective switches (WSS) 163a and 163b are used to draw; BHz/2BHz outgoing side interleaver 164; Two M * 1-port 2BHz spacing wavelength-selective switches (WSS) 165a and 165b are used to insert.Core cell 160 can be supported the transmission signals by BHz (for example 50Hz) spacing.164 transmission signals by the 2BHz spacing of outgoing side interleaver are recovered to the transmission signals by the BHz spacing, and export this transmission signals.Note, 2BHz represent the twice of BHz frequency (if B=50G, 2BHz=100GHz).

Wavelength-selective switches or (not shown) such as grouping light filter etc. are also connected to and are used for the wavelength-selective switches 163a that draws at core cell 160 and a plurality of ports of 163b, and photo-coupler etc. are connected to the port that is used to insert, and this allows function is expanded to high accounting channel DOADM from low accounting channel DOADM.In addition, the combination to a plurality of wavelength-selective switches allows function is expanded to WXC.At the design of wavelength-selective switches or when making constriction wavelength spacing, port number is restricted sometimes when specifically.According to core cell 160,, can easily realize expansion by wavelength-selective switches 163a, 163b, 165a and the 165b of the wide spacing (2BHz) of the twice of using supporting signal wavelength spacing (BHz) with this structure.

Figure 27 is the synoptic diagram that is used to change the core cell of wavelength spacing.Insert unit 170 and comprise BHz/2BHz interleaver 171 and M * 1-port 2BHz spacing wavelength-selective switches (WSS) 172.Even transmission signals is BHz, this structure also allows the wavelength spacing of being handled by wavelength-selective switches 172 is widened (relaxing) to 2BHz.Insert the inserting side port that unit 170 is connected to the core cell 160 of Figure 26, to allow that function is expanded to high accounting channel DOADM from low accounting channel DOADM.

Figure 28 is the synoptic diagram of drawing the unit that is used to change the wavelength spacing.Draw unit 180 and comprise BHz/ 2BHz interleaver 181 and 1 * N-port 2BHz spacing wavelength-selective switches (WSS) 182.Even transmission signals is BHz, this structure also allows the wavelength spacing of being handled by wavelength-selective switches 182 is widened (relaxing) to 2BHz.Draw unit 180 and be connected to the outlet side port of the core cell 160 of Figure 26, to allow that function is expanded to high accounting channel DOADM from low accounting channel DOADM.

Figure 29 is the synoptic diagram that is used to explain the function expansion of core cell.(when initial the introducing) is provided with core cell 190a before the function expansion, and the transmission signals of this moment is BHz.When initial introducing with little message capacity, between a pair of interleaver 191 and 192, arrange 1 * 2 photo-coupler 193a, 1 * N-port 2BHz spacing wavelength-selective switches (WSS) 194a and M * 1-port 2BHz spacing wavelength-selective switches (WSS) 195a, and start this equipment to operate.

When message capacity increases and needs interpolation equipment, expand function.At this moment, by additional another group 1 * 2 photo-coupler 193b, 1 * N-port 2BHz spacing wavelength-selective switches (WSS) 194b and M * 1-port 2BHz spacing wavelength-selective switches (WSS) 195b that be provided with between a pair of interleaver 191 and 192, can dispose core cell 190b.This structure allows to expand in the operation transmission signals, and this makes and can use general wavelength-selective switches increase to insert/draw the quantity of port.In addition, will inner structure not be replaced with another inner structure, this makes and can realize the function expansion by low cost.

Below the luminous power in a plurality of parts of core cell control is explained.Figure 30 A is the synoptic diagram of the luminous power control in the core cell.Core cell 200 comprises 1 * 2 photo-coupler 201, the 1 * N-port wavelength-selective switches (WSS) 202 that is used to draw and the M * 1-port wavelength-selective switches (WSS) 203 that is used to insert.In the output of this M * 1-port wavelength-selective switches (WSS) 203, be furnished with the component of power monitor and the monitor 204 of luminous power.Monitor 204 comprises such as the photodetector of PD and is used for detecting each channel strength or the overall optical signal power of light WDM signal.Wavelength-selective switches 203 is regulated the optically-coupled of passing through signal (main signal) and insertion signal by core cell 200 at each channel, to carry out luminous power control.

Figure 30 B is the synoptic diagram of another luminous power control in the core cell.Core cell 210 comprises 1 * N-port wavelength-selective switches (WSS) 211 that is used to draw and the M * 1-port wavelength-selective switches (WSS) 212 that is used to insert.In the output of this M * 1-port wavelength-selective switches (WSS) 212, be furnished with the component of power monitor and at each channel light power or whole monitors 213 of luminous powers.Arrange according to this, at each channel the optically-coupled of passing through signal (main signal) and insertion signal by core cell 210 is regulated, to carry out luminous power control.

Figure 31 is the synoptic diagram of another luminous power control in the core cell.Core cell 220 comprises 1 * 2 photo-coupler 221, the 1 * N-port wavelength-selective switches (WSS) 222 that is used to draw and the M * 1-port wavelength-selective switches (WSS) 223 that is used to insert.Be furnished with the component and the monitor 224 of power monitor at the output of the wavelength-selective switches 222 that is used for drawing.Will be to regulate in wavelength-selective switches 222 from the optical level of wavelength-selective switches 222 outputs at each wavelength regulation optically-coupled.The feasible optical level of drawing signal that can control each channel of this adjusting.

Figure 32 A is the synoptic diagram of another luminous power control in the core cell.Core cell 230 comprises 1 * N-port wavelength-selective switches (WSS), 231,2 * 1 photo-couplers 232 that are used to draw and the M * 1-port wavelength-selective switches (WSS) 233 that is used to insert.In the output of wavelength-selective switches 231, be furnished with the component and the monitor 234 of power monitor.In wavelength-selective switches 231 at the optical level of each wavelength regulation optically-coupled with the efferent office that is adjusted in wavelength-selective switches 231.This adjusting makes can be at each channel to passing through signal (main signal) and carrying out luminous power control to drawing signal by core cell 230.

Figure 32 B is the synoptic diagram of another luminous power control in the core cell.Core cell 240 comprises 1 * N-port wavelength-selective switches (WSS) 241 that is used to draw and the M * 1-port wavelength-selective switches (WSS) 242 that is used to insert.In the output of wavelength-selective switches 241, be furnished with the component and the optical power monitor 243 of power monitor.At each channel adjustment optically-coupled, this makes can be at each channel to passing through signal (main signal) and carrying out luminous power control to drawing signal by core cell 230 in wavelength-selective switches 241.

Figure 33 is the synoptic diagram of another luminous power control in the core cell.Core cell 250 comprises 1 * N-port wavelength-selective switches (WSS), 251,2 * 1 photo-couplers 252 that are used to draw and the M * 1-port wavelength-selective switches (WSS) 253 that is used to insert.In the output of wavelength-selective switches 253, be furnished with the component and the monitor 254 of power monitor.In wavelength-selective switches 253,, the luminous power of drawing signal is controlled so that can carry out at each channel at each channel adjustment optically-coupled.

In the topology example 1 to 6 (Figure 30 A is to Figure 33) of the luminous power control in these core cells, can use the spectrum monitoring device to replace monitor 204 to monitor 254.Alternatively, can use the optical power monitor array as monitor.

Below the upgrading example 1 in service according to optical add/drop multiplexer of the present invention is explained.Figure 34 A is the figure of the structure of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 300a forms low accounting channel (LCC) DOADM.As shown in the figure, the core cell 301a of optical add/drop multiplexer 300a comprise 1 * 2 photo-coupler 310, the 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 311 that is used to draw and the 9 * 1-port 50GHz spacing wavelength-selective switches (WSS) 312 that is used to insert.Core cell 301a with draw unit 302a and insert unit 303a and be connected.According to this structure, will draw quantity to the signal of drawing unit 302a corresponding to maximum 8 ports by core cell 301a, be from the quantity of inserting the signal that unit 303a inserts corresponding to maximum 9 ports.Can draw or insert from wavelength cross connection device (not shown) etc. and wait a part of signal of drawing or inserting.

Figure 34 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 34 A.The core cell 301a of optical add/drop multiplexer 300b have with Figure 34 A in identical structure.That is, in core cell 301a, do not change any part.Yet, changed each structure of drawing unit 302a and inserting unit 303a.Newly draw unit 302b and comprise optics demultiplexer (DeMux) 321, comprise optical multiplexer (Mux) 322 and newly insert unit 303b.This structure allows optical add/drop multiplexer 300b that function is expanded to and supports the cross-coupled ROADM of wavelength.

Figure 34 C is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A.The core cell 301a of optical add/drop multiplexer 300c have with Figure 34 A in identical structure.That is, in core cell 301a, do not change any part.Yet, change over and draw unit 302c and insert unit 303c drawing unit 302a and inserting unit 303a respectively.Draw unit 302c and comprise 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 331, comprise 16 * 1-port photo-coupler (CPL) 333 and insert unit 303c.Shown in Figure 34 C,, also can be drawn out to a plurality of 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 331 to the signal that a port from a plurality of ports of core cell 301a is drawn in drawing unit 302c by 1 * 2 photo-coupler 332 is set.In inserting unit 303c, can arrange a plurality of 16 * 1-port photo-couplers (CPL) 333.This structure allows optical add/drop multiplexer 300c that function is expanded to high accounting channel (HCC) DOADM.

In addition, the part of 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 311 of core cell 301a is connected with 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 331 of drawing unit 302c, and all the other ports are connected to wavelength cross connection device (not shown), and this allows function is expanded to the support cross-coupled high accounting channel of wavelength (HCC) DOADM.

Figure 34 D is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A.The core cell 301a of optical add/drop multiplexer 300d have with Figure 34 A in identical structure, but the quantity of core cell 301a is increased to 4 (core cells 1 to core cells 4).This structure allows route quantity is increased to 4 and function expanded to the WXC structure from 1.Function is being expanded to the function that ROADM (seeing Figure 34 B) can expand to function Figure 34 D afterwards, perhaps function is being expanded to the function that high accounting channel (HCC) DOADM (seeing Figure 34 C) can expand to function Figure 34 D afterwards.Note, in Figure 34 D, omitted for simplicity's sake and drawn the unit and insert the unit.

Figure 34 E is the synoptic diagram that is used to explain another expansion of the optical add/drop multiplexer shown in Figure 34 A.Optical add/drop multiplexer 300e is the example of having revised after the drawing unit 302c and inserting unit 303c shown in Figure 34 C.In drawing unit 302e, be provided with 1 * 10 grouping light filter (GF) 341, in inserting unit 303e, be provided with 16 * 1-port photo-coupler (CPL) 342.This structure allows optical add/drop multiplexer 300e that function is expanded to high accounting channel (HCC) DOADM.Grouping light filter 341 is than WSS 311 (seeing Figure 34 C) cheapness, and this makes and can reduce cost.

The grouping light filter 341 of drawing unit 302e is connected to a part of port of the 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 311 among the core cell 301a, and all the other ports are connected to wavelength cross connection device (not shown).Thereby can expand to function and support the cross-coupled limited wavelength DOADM of wavelength.

The structure to the expansion of the function shown in Figure 34 E as Figure 34 B can be set under the situation of not changing core cell 301a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

Below the upgrading example 2 in service according to optical add/drop multiplexer of the present invention is explained.Figure 35 A is the synoptic diagram of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 350a forms low accounting channel (LCC) DOADM.As shown in the figure, the core cell 351a of optical add/drop multiplexer 350a comprises a pair of 50GHz/100GHz interleaver (IL) 352a and the 352b that is positioned at its input side and outgoing side.Interleaver 352a comprises two 1 * 2 photo- coupler 353a and 353b, two 1 * 8-port one 00GHz spacing wavelength-selective switches (WSS) 354a that are used to draw and 354b and two 9 * 1-port one 00GHz spacing wavelength-selective switches (WSS) 355a that are used to insert and 355b.

Core cell 351a with draw unit 361a and insert unit 362a and be connected.According to this structure, will draw quantity to the signal of drawing unit 361a corresponding to maximum 16 ports by core cell 351a, be from the quantity of inserting the signal that unit 362a inserts corresponding to maximum 18 ports.Can draw or insert a part of having drawn or having inserted in the signal at wavelength cross connection device (not shown) etc.

Figure 35 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A.The core cell 351a of optical add/drop multiplexer 350b have with Figure 35 A in identical structure.That is, in core cell 351a, do not change any part.Yet, changed each structure of drawing unit 361a and inserting unit 362a.Draw unit 361b and comprise two optics demultiplexer (DeMux) 363a and 363b, comprise optical multiplexer (Mux) 364a and 364b and insert unit 362b.This structure allows optical add/drop multiplexer 350b that function is expanded to and supports the cross-coupled ROADM of wavelength.

Figure 35 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A.The core cell 351a of optical add/drop multiplexer 350c have with Figure 35 A in identical structure.Yet, changed each structure of drawing unit 361a and inserting unit 362a.Draw unit 361c and comprise two 1 * 16-port grouping light filter (GF) 371a and 371b, comprise two 16 * 1-port photo-coupler (CPL) 372a and 372b and insert unit 362c.This structure allows optical add/drop multiplexer 350c that function is expanded to and supports the high accounting channel of the cross-coupled limited wavelength of wavelength (HCC) DOADM.In drawing unit 361c, can a big quantity grouping light filter be set accordingly with required drawing with channel quantity.Similarly, in inserting unit 362c, can with channel quantity a bigger quantity photo-coupler be set accordingly with required insertion.Wavelength cross connection device (not shown) etc. is drawn or be inserted into to the part that can draw or insert waiting in the signal.

Figure 35 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 35 A.The core cell 351a of optical add/drop multiplexer 350d have with Figure 35 A in identical structure, but the quantity of core cell 351a is increased to 4 (core cells 1 to core cells 4).This structure allows route quantity is increased to 4 and function expanded to the WXC structure from 1.Function is being expanded to the function that ROADM (seeing Figure 35 B) can expand to function Figure 35 D afterwards, perhaps function is being expanded to the function that high accounting channel (HCC) DOADM (seeing Figure 35 C) can expand to function Figure 35 D afterwards.Note, in Figure 35 D, omitted for simplicity's sake and drawn the unit and insert the unit.

The structure to the expansion of the function shown in Figure 35 D as Figure 35 B can be set under the situation of not changing core cell 351a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

Below the upgrading example 3 in service according to optical add/drop multiplexer of the present invention is explained.Figure 36 A is the synoptic diagram of the structure of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 380a forms ROADM.The core cell 381a of optical add/drop multiplexer 380a comprises 1 * 2 photo-coupler 391,50GHz spacing wavelength separator (WB) 392 and 2 * 1 photo-couplers 393.Draw unit 382a and comprise optics demultiplexer (DeMux) 400, comprise optical multiplexer (Mux) 401 and insert unit 383a.

Figure 36 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A.The core cell 381a of optical add/drop multiplexer 380b have with Figure 36 A in identical structure.That is, in core cell 381a, do not change any part.Yet, in the outlet side port of core cell 381a, be provided with the 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 395 that is used to carry out the light demultiplexing.In the port of the inserting side of core cell 381a, be provided with the 8 * 1-port 50GHz spacing wavelength-selective switches (WSS) 396 that is used to recover usefulness.These parts are configured to the unit different with core cell 381a, and additionally arrange unit as core cell 381b.This is arranged and allows optical add/drop multiplexer 380b to realize as the function expansion of hanging down accounting channel (LCC) DOADM.In this structure, can draw the optics demultiplexer 400 of unit 382a to placing shown in Figure 36 A and place the optical multiplexer 401 that inserts unit 383a separately and with them to be used for another device.Also can draw or be inserted into wavelength cross connection device (not shown) to a part of input port of a part of output port of wavelength-selective switches 395 and wavelength-selective switches 396.

Figure 36 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A.The core cell 381a of optical add/drop multiplexer 380c have with Figure 36 A in identical structure.That is, in core cell 381a, do not change any part.Yet, in the outlet side port of core cell 381b, be provided with the 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 395 that is used to carry out the light demultiplexing.In the port of the inserting side of core cell 381b, be provided with the 8 * 1-port 50GHz spacing wavelength-selective switches (WSS) 396 that is used to recover usefulness.At least one of a plurality of output ports that is arranged in the wavelength-selective switches 395 of outlet side is connected to the optics demultiplexer (DeMux) 400 of drawing unit 382a, and at least one of a plurality of input ports that is arranged in the wavelength-selective switches 396 of inserting side is connected to the optical multiplexer (Mux) 401 that inserts unit 383a.This is arranged and allows optical add/drop multiplexer 380c to realize as the function expansion of supporting the cross-coupled ROADM of wavelength.Also can dispose optical add/drop multiplexer 380c by the function of expansion optical add/drop multiplexer 380b (seeing Figure 36 B).

Figure 36 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A.Be equal to optical add/drop multiplexer 380b (seeing Figure 36 B) at the functional status that is right after the optical add/drop multiplexer 380d shown in Figure 36 D before it is configured based on (LCC) DOADM.Do not change the structure of core cell 381a and 381b.Yet, draw unit 382b and comprise 1 * 2 photo-coupler 411 and two 1 * 8-port 50GHz spacing wavelength-selective switches (WSS) 412.Insert unit 383b and comprise 16 * 1 photo-couplers (CPL) 413.This structure allows function is expanded to high accounting channel (HCC) DOADM.Can be arranged on photo-coupler 411 and the quantity of wavelength-selective switches 412 and the quantity that is arranged on the photo-coupler 413 among the insertion unit 383b of drawing among the unit 382b by the requirement increase.Also can draw or be inserted into wavelength cross connection device (not shown) to a part of input port of a part of output port of wavelength-selective switches 395 and wavelength-selective switches 396.

Figure 36 E is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A.Be equal to optical add/drop multiplexer 380c (seeing Figure 36 C) in the functional status at ROADM at the functional status that is right after the optical add/drop multiplexer 380e shown in Figure 36 E before it is configured, or be equal to the optical add/drop multiplexer 380d (seeing Figure 36 D) in the functional status of (HCC) DOADM.Be connected with many to core cell 381a and 381b, to allow that function is expanded to the optical add/drop multiplexer 380e that comprises WXC.For simplicity's sake, the function to a pair of core cell 381a and 381b is described in a core cell shown in Figure 36 E.Not shown structure of drawing unit 382a and 382b and insertion unit 383a and 383b, but these unit are connected respectively to core cell.

Figure 36 F is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 36 A.Optical add/drop multiplexer 380f shown in Figure 36 F is in the function extended mode of (HCC) DOADM, and is another topology example that can change the structure of Figure 36 D.In the optical add/drop multiplexer 380f shown in Figure 36 F, in drawing unit 382c, be furnished with 1 * 16-port grouping light filter (GF) 416.Insert unit 383b and use 16 * 1-port photo-coupler (CPL) 413.In the topology example of Figure 36 F, can further expand to WXC shown in Figure 36 E to function.

The structure to the expansion of the function shown in the 36F as Figure 36 B can be set under the situation of not changing core cell 381a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

Below the upgrading example 4 in service according to optical add/drop multiplexer of the present invention is explained.Figure 37 A is the synoptic diagram of the structure of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 430a forms ROADM.The core cell 431a of optical add/drop multiplexer 430a comprises 1 * 2 photo-coupler 432,50GHz spacing wavelength separator (WB) 433 and 2 * 1 photo-couplers 434.Core cell 431b is formed module by the mode different with core cell 431a.Core cell 431b comprises 50GHz/100GHz interleaver (IL) 435 that is connected to its outlet side port and the 50GHz/100GHz interleaver (IL) 436 that is connected to its inserting side port.Draw unit 432a and comprise two optics demultiplexers (DeMux) 441, comprise two optical multiplexers (Mux) 442 and insert unit 433a.

Figure 37 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A.Core cell 431a and the 431b of optical add/drop multiplexer 430b have with Figure 37 A in identical structure.That is, in core cell 431a and 431b, do not change any part.Yet core cell 431b also is connected with the core cell 431c that is configured to another unit.Core cell 431c comprises a plurality of 1 * 8-port one 00GHz spacing wavelength-selective switches (WSS) 451 that are used to draw and a plurality of 8 * 1-port one 00GHz spacing wavelength-selective switches (WSS) 452 that are used to insert.This is arranged and allows optical add/drop multiplexer 430b to realize as the function expansion of hanging down accounting channel (LCC) OADM.Also can draw or be inserted into wavelength cross connection device (not shown) to a part of input port of a part of output port of wavelength-selective switches (WSS) 451 and wavelength-selective switches (WSS) 452.In this structure, can draw the optics demultiplexer 441 of unit 432a to placing shown in Figure 37 A and place the optical multiplexer 442 that inserts unit 433a separately and with them to be used for another device.

Figure 37 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A.Below expansion is described to the function of carrying out from the function of low accounting channel (LCC) DOADM shown in Figure 37 B.Each core cell 431a, the 431b of optical add/ drop multiplexer 430c and 431c have with Figure 37 B in identical structure.That is, do not change any part therein.

At least one of a plurality of output ports that is arranged in the wavelength-selective switches 451 of outlet side is connected to the optics demultiplexer (DeMux) 441 of drawing unit 432a.At least one of a plurality of input ports that is arranged in the wavelength-selective switches 452 of inserting side is connected to the optical multiplexer (Mux) 442 that inserts unit 433a.This is arranged and allows optical add/drop multiplexer 430c to realize as the function expansion of supporting the cross-coupled ROADM of wavelength.Can dispose optical add/drop multiplexer 430c by the function of expansion optical add/drop multiplexer 430a (seeing Figure 37 A).In the time will changing function from the original state of Figure 37 A, can be by additionally arranging core cell 431c with upper type.

Figure 37 D is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A.Be equal to based on the optical add/drop multiplexer (seeing Figure 37 B) that hangs down accounting channel (LCC) DOADM at the functional status that is right after the optical add/drop multiplexer 430d shown in Figure 37 D before it is configured.Do not change the structure of core cell 431a, 431b and 431c.Draw unit 432b and comprise 1 * 10-port grouping light filter (GF) 455.Insert unit 433b and comprise 16 * 1-port photo-coupler (CPL) 456.This structure allows function is expanded to high accounting channel (HCC) DOADM.Also can draw or be inserted into wavelength cross connection device (not shown) to a part of input port of a part of output port of wavelength-selective switches 451 or wavelength-selective switches 452.Also can be arranged on the quantity of the grouping light filter 455 of drawing among the unit 432b and be arranged on the quantity of inserting the photo-coupler 456 among the unit 433b by required port quantity is additional.

Figure 37 E is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 37 A.Be equal to optical add/drop multiplexer 430c (seeing Figure 37 C) in the functional status at ROADM at the functional status that is right after the optical add/drop multiplexer 430e shown in Figure 37 E before it is configured, or be equal to the optical add/drop multiplexer 430d (seeing Figure 37 D) in the functional status of (HCC) DOADM.The group that constitutes such as these three unit of core cell 431a, 431b and 431c is connected with a plurality of, and this permission expands to the optical add/drop multiplexer 430e that comprises WXC to function.Shown in Figure 37 E, for simplicity's sake, three unit such as core cell 431a, 431b and 431c are described by a core cell.Wherein not shown structure of drawing unit 432a and 432b and insertion unit 433a and 433b, but these unit are connected respectively to core cell 431a, 431b and 431c.

The structure to the expansion of the function shown in the 37E as Figure 37 B can be set under the situation of not changing core cell 431a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

Below the upgrading example 5 in service according to optical add/drop multiplexer of the present invention is explained.Figure 38 A is the synoptic diagram of the structure of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 500a forms ROADM.The core cell 501a of optical add/drop multiplexer 500a comprises 1 * 2 photo- coupler 511 and 4 * 1-port wavelength-selective switches (WSS) 512.Draw unit 502a and comprise 1 * N-port optics demultiplexer (DeMux) 515, comprise M * 1-port optical multiplexer (Mux) 516 and insert unit 503a.

Figure 38 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 38 A.The core cell 501a of optical add/drop multiplexer 500b have with Figure 38 A in identical structure.That is, in core cell 501a, do not change any part.Yet core cell 501a also is connected with the core cell 501b that is configured to another unit.Core cell 501b comprises 1 * 3 photo-coupler (CPL) 520 that is used to draw.One in a plurality of output ports of photo-coupler 520 is connected to and draws unit 502a, and can expand the function of other output ports so that it has the wavelength cross connection.

Figure 38 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 38 A.Optical add/drop multiplexer 500c comprises many to (having illustrated four couples among Figure 38 C) core cell 501a and the 501b shown in Figure 38 B, so that function is expanded to WXC.In this topology example, can be shown in Figure 59 between two transmission path ring A and B switching signal.

Shown in Figure 38 C, between a plurality of input ports of a plurality of output ports of the photo-coupler 520 that is used to draw and the wavelength-selective switches 512 that is used to insert, different core cells interconnect.For example, some output ports of the photo-coupler 520 in the core cell 1 are connected to a plurality of input ports of the wavelength-selective switches 512 in core cell 3 and the core cell 4.Some output ports of photo-coupler 520 in the core cell 2 are connected to a plurality of input ports of the wavelength-selective switches 512 in core cell 3 and the core cell 4.Some output ports of photo-coupler 520 in the core cell 3 are connected to a plurality of input ports of the wavelength-selective switches 512 in core cell 1 and the core cell 2.Some output ports of photo-coupler 520 in the core cell 4 are connected to a plurality of input ports of the wavelength-selective switches 512 in core cell 1 and the core cell 2.Use symbol " # " description to be input to the transmission path route of core cell or the transmission path route of exporting from core cell.Core cell 1 is to the input of route #2 output route #1.Core cell 2 is to the input of route #1 output route #2.Core cell 3 is to the input of route #4 output route #3.Core cell 4 is to the input of route #3 output route #4.

Shown in Figure 59, optical add/drop multiplexer 500c is configured to comprise the wavelength cross connection portion of four routes, and can be between route #1 and route #2, route #1 and route #3, route #1 and route #4, route #2 and route #3, route #2 and route #4 and route #3 and route #4 switching signal.

The structure of the function expansion shown in Figure 38 B and 38C can be set under the situation of not changing core cell 501a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

Below the upgrading example 6 in service according to optical add/drop multiplexer of the present invention is explained.Figure 39 A is the synoptic diagram of the structure of the optical add/drop multiplexer when initial the introducing.Optical add/drop multiplexer 530a forms ROADM.The core cell 531a of optical add/drop multiplexer 530a comprises 1 * 2 photo- coupler 531 and 3 * 1-port wavelength-selective switches (WSS) 532.Draw unit 532a and comprise 1 * N-port optics demultiplexer (DeMux) 541, comprise M * 1-port optical multiplexer (Mux) 542 and insert unit 533a.

Figure 39 B is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 39 A.The core cell 531a of optical add/drop multiplexer 530b have with Figure 39 A in identical structure.That is, in core cell 531a, do not change any part.Yet core cell 531a also is connected with the core cell 531b that is configured to another unit.Core cell 531b comprises 1 * 2 photo-coupler (CPL) 544 that is used to draw.One in a plurality of output ports of photo-coupler 544 is connected to and draws unit 532a, and can expand its function so that other output ports have the wavelength cross connection.

Figure 39 C is the synoptic diagram that is used to explain the expansion of the optical add/drop multiplexer shown in Figure 39 A.Optical add/drop multiplexer 530c comprises many to (having illustrated four couples among Figure 39 C) core cell 531a and the 531b shown in Figure 39 B, so that function is expanded to WXC.

Shown in Figure 39 C, between a plurality of input ports of a plurality of output ports of the photo-coupler 544 that is used to draw and the wavelength-selective switches 532 that is used to insert, different core cells interconnect.For example, in a plurality of output ports of the photo-coupler 544 in the core cell 1 is connected in a plurality of input ports of the wavelength-selective switches 532 in the core cell 4 one.In a plurality of output ports of the photo-coupler 544 in the core cell 2 one is connected in a plurality of input ports of the wavelength-selective switches 532 in the core cell 3.In a plurality of output ports of the photo-coupler 544 in the core cell 3 one is connected in a plurality of input ports of the wavelength-selective switches 532 in the core cell 2.In a plurality of output ports of the photo-coupler 544 in the core cell 4 one is connected in a plurality of input ports of the wavelength-selective switches 532 in the core cell 1.Use symbol " # " description to be input to the transmission path route of core cell or the transmission path route of exporting from core cell.Core cell 1 is to the input of route #2 output route #1.Core cell 2 is to the input of route #1 output route #2.Core cell 3 is to the input of route #4 output route #3.Core cell 4 is to the input of route #3 output route #4.

The structure of the function expansion shown in Figure 39 B and 39C can be set under the situation of not changing core cell 531a.Therefore, even in system's operational process, also can under the situation that does not reconnect optical fiber and disconnection main signal, expand function.

The synoptic diagram of the signal exchange that Figure 39 D carries out between many transmission paths when being the expansion that is used to be illustrated in shown in the execution graph 39C.Shown in Figure 39 D, there are the transmission path A (optical fiber 1301a and optical fiber 1301b) that forms by the optical add/drop multiplexer 530c that comprises WXC and two rings of transmission path B (1302a and optical fiber 1302b), and between transmission path A and B, carry out signal exchange.The optical add/drop multiplexer 530c that is explained as reference Figure 39 C is configured to comprise the wavelength cross connection portion of four routes, and can be in switching signal between route #1 and the route #2, between route #1 and the route #4, between route #2 and the route #3 and between route #3 and the route #4.Optical add/drop multiplexer 530c has with optical add/drop multiplexer 500c (seeing Figure 38 C) and compares the function that optional route quantity is restricted, but has the advantage that has realized simplified structure.

Figure 40 A is the synoptic diagram of the structure when using interleaver as the grouping light filter at outlet side.Interleaver 551 is connected in a plurality of output ports of 1 * N-port wavelength-selective switches (WSS) 550.Shown in Figure 40 A, the quantity of the wavelength of transmission signals (λ) is at most 80 ripples, and 1 * 8-port interleaver 551 is used as grouping light filter (GF).Input signal to interleaver 551 is up to 8 ripples by the 50GHz spacing.

In the example shown in Figure 40 A, these 8 ripples are λ 1, λ 2, λ 14, λ 23, λ 27, λ 52, λ 69 and λ 80.In interleaver 551, sequentially connect a 100GHz/50GHz interleaver 551a, two 200GHz/100GHz interleaver 551b and four 400GHz/200GHz interleaver 551c.This connection allows from the output of 8 ports altogether the input signal by the 50GHz spacing to be carried out demultiplexing, and gives each port 10 ripples (10 λ) assignment.In actual mechanical process, export the ripple (for example, port one output λ 23) in these 10 ripples.

Figure 40 B is the synoptic diagram of the structure when using interleaver as the grouping light filter in the inserting side.8 * 1-port interleaver (IL) 553 is used as grouping light filter (GF).In the example shown in Figure 40 B, be λ 1, λ 2, λ 14, λ 23, λ 27, λ 52, λ 69 and λ 80 to the input signal of interleaver 553.In interleaver 553, sequentially connect four 400GHz/200GHz interleaver 553a, two 200GHz/100GHz interleaver 553b and a 100GHz/50GHz interleaver 553c.This connection allows to import to 8 ports altogether, and gives each port 10 ripple assignments.In actual mechanical process, import the ripple (for example, to port one input λ 23) in these 10 ripples.Output by 50GHz spacing interleaver 553 is set to a plurality of signals, and is connected in a plurality of input ports of N * 1-port wavelength-selective switches (WSS) 554 one.With wherein these interleavers to be compared the transport property of these interleavers 551 and 553 as another system of grouping light filter very excellent.

Below to using interleaver to explain as the concrete example of the structure of grouping light filter.Figure 34 F is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 G is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 34 F.In the structure of Figure 34 E, if the number of wavelengths to the main signal of core cell 301a input is 40 wavelength, then be connected in 5 output ports in 8 output ports of wavelength-selective switches 311 each as grouping light filter (GF) 341 interleaver 343 (seeing Figure 34 G), and the output port of different wavelength assignments to all interleavers 343.By 3 remaining ports are connected to the wavelength cross connection device, can overcome and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 40 wavelength of main signal.

Figure 34 H is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 I is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 34 H.In the structure of Figure 34 E, if the number of wavelengths to the main signal of core cell 301a input is 80 wavelength, then 1 * 2 photo-coupler 346 is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 311 each, the 1 * 8-port interleaver 343a (seeing Figure 34 I) as grouping light filter (GF) 341 is connected to two output ports of photo-coupler 346.Thus, different wavelength assignments is given all output ports of interleaver 343a.By 3 remaining ports are connected to the wavelength cross connection device, can overcome and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 36 G is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 H is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 36 G.In the structure of Figure 36 F, if the number of wavelengths to the main signal of core cell 381a input is 40 wavelength, then 1 * 8-port the interleaver 417 (seeing Figure 36 H) as the light filter 416 that divides into groups is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 395 each.Different wavelength assignments all output ports to interleaver 417, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 40 wavelength of main signal.

Figure 36 I is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 J is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 36 I.If the number of wavelengths to the main signal of the core cell 381a shown in Figure 36 F input is 80 wavelength, then 1 * 2-port photo-coupler 418 is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 395 each, and the 1 * 8-port interleaver 417 (seeing Figure 36 J) as grouping light filter (GF) 416 is connected to two output ports of photo-coupler 418.Give all output ports of interleaver 417 different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 35 E is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 35 C.Figure 35 F is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 35 E.In the structure of Figure 35 C, if the number of wavelengths to the main signal of core cell 351a input is 80 wavelength, then 1 * 8-port the interleaver 373 (seeing Figure 35 F) as the light filter 371a/371b that divides into groups is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 354a and 354b each.Give all output ports of interleaver 373 different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 37 F is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D.Figure 37 G is the synoptic diagram that forms the interleaver of the grouping light filter (GF) shown in Figure 37 F.In the structure of Figure 37 D, if the number of wavelengths to the main signal of core cell 431a input is 80 wavelength, then 1 * 8-port the interleaver 457 as the light filter (GF) 455 that divides into groups is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 451 each.Give all output ports of interleaver 457 different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 41 A uses band to divide the synoptic diagram of light filter as the topology example of grouping light filter at outlet side.Be with in a plurality of output ports that divide light filter (BDF) 561 to be connected to 1 * N-port wavelength-selective switches (WSS) 560.Shown in Figure 41 A, the quantity of the wavelength of transmission signals (λ) is at most 80 ripples, divides 1 * 8-port band light filter 561 as grouping light filter (GF).Give 8 output ports being with branch light filter 561 assignment of 8 wavelength (8 λ) difference, and be used for practical operation to one in these 8 wavelength.

Figure 41 B uses band to divide the synoptic diagram of light filter as the topology example of grouping light filter in the inserting side.8 wavelength are distinguished 8 input ports that assignment divides light filter (BDF) 563 for 8 * 1-port band, and be used for practical operation to one in these 8 wavelength.Divide in a plurality of output ports that the output of light filter 563 is connected to N * 1-port wavelength-selective switches (WSS) 564 one band.Divide light filter 561 and 563 according to band, have necessity and guarantee disabled boundary belt (guardband).This buffer zone may cause available conduction band (guide band) to be restricted.Yet, compare with some other system (wherein using band to divide light filter) as the grouping light filter, can realize that band divides light filter 561 and 563 by low cost.

Below to using band to divide light filter to explain as the concrete example of the structure of grouping light filter.Figure 34 J is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 L is the synoptic diagram that the band of the grouping light filter (GF1,3,5) shown in formation Figure 34 J divides light filter.In the structure of Figure 34 E, if the number of wavelengths to the main signal of core cell 301a input is 40 wavelength, then divide in 5 output ports in 8 output ports that light filter (BDF) 344a and 344b be connected to wavelength-selective switches (WSS) 311 each band as grouping light filter 341.Give all output ports of being with branch light filter 344a and 344b different wavelength assignments, and 3 remaining ports are connected to the wavelength cross connection device.Can relax thus the quantitative limitation of use number of wavelengths (this is the problem that produces when using the grouping light filter), and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with described 40 wavelength.

Figure 34 M is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.

Figure 34 N is the synoptic diagram that the band of the grouping light filter (GF2,4,6,8 and 10) shown in formation Figure 34 M divides light filter.Figure 34 N is the synoptic diagram that the band of the grouping light filter (GF2,4,6,8 and 10) shown in formation Figure 34 M divides light filter.Figure 34 O is the synoptic diagram that the band of the grouping light filter (GF1,3,5,7 and 9) shown in formation Figure 34 M divides light filter.If the number of wavelengths to the main signal of the core cell 301a shown in Figure 34 E input is 80 wavelength, then 1 * 2-port photo-coupler 344 is connected in 5 output ports in 8 output ports of wavelength-selective switches (WSS) 311 each, and divides in two output ports that light filter 344c and 344d be connected to photo-coupler 344 each (1 * 8-port) band as grouping light filter (GF) 341.Give all output ports of being with branch light filter 344c and 344d different wavelength assignments, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 36 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 L is the synoptic diagram that the band of the grouping light filter (GF2,4) shown in formation Figure 36 K divides light filter.Figure 36 M is the synoptic diagram that the band of the grouping light filter (GF1,3,5) shown in formation Figure 36 K divides light filter.If the number of wavelengths to the main signal of the core cell 381a shown in Figure 36 F input is 40 wavelength, each in 5 ports in 8 output ports that (1 * 8-port) band minute light filter 419a and 419b as grouping light filter (GF) 416 are connected to wavelength-selective switches (WSS) 395 then.Give all output ports of being with branch light filter 419a and 419b different wavelength assignments, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 40 wavelength of main signal.

Figure 36 N is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 O is the synoptic diagram that the band of the grouping light filter (GF2,4,6,8 and 10) shown in formation Figure 36 N divides light filter.Figure 36 P is the synoptic diagram that the band of the grouping light filter (GF1,3,5,7 and 9) shown in formation Figure 36 N divides light filter.If the number of wavelengths to the main signal of the core cell 301a shown in Figure 36 F input is 80 wavelength, then 1 * 2-port photo-coupler 418 is connected in 5 ports in 8 output ports of wavelength-selective switches (WSS) 395 each, and divides in two output ports that light filter 419c and 419d be connected to photo-coupler 418 each (1 * 8-port) band.Give all output ports of being with branch light filter 419c and 419d different wavelength assignments, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 35 G is the synoptic diagram of another concrete structure of the optical add/drop multiplexer shown in Figure 35 C.Figure 35 H is the synoptic diagram that the band of the grouping light filter (GF2,4,6,8 and 10) shown in formation Figure 35 G divides light filter 373a.Figure 35 I is the synoptic diagram that the band of the grouping light filter (GF1,3,5,7 and 9) shown in formation Figure 35 G divides light filter 373d.In the structure of Figure 35 C, if the number of wavelengths to the main signal of core cell 351a input is 80 wavelength, each in 5 ports in 8 output ports that (1 * 8-port) band minute light filter 373a and 373b as grouping light filter (GF) 371a/371b are connected to wavelength-selective switches (WSS) 354a and 354b then.Give all output ports of being with branch light filter 373a and 373b different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 37 H is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D.Figure 37 I is the synoptic diagram that the band of the grouping light filter (GF2,4,6,8 and 10) shown in formation Figure 37 H divides light filter.Figure 37 J is the synoptic diagram that the band of the grouping light filter (GF1,3,5,7 and 9) shown in formation Figure 37 H divides light filter.In the structure of Figure 37 D, if the number of wavelengths to the main signal of core cell 431a input is 80 wavelength, each in 5 ports in 8 output ports that (1 * 8-port) band minute light filter 458a and 458b as grouping light filter (GF) 455 are connected to corresponding wavelength-selective switches (WSS) 451 then.Give all output ports of being with branch light filter 458a and 458b different wavelength assignments, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 42 A is the synoptic diagram of the structure when using colourless AWG as the grouping light filter at outlet side.Colourless AWG 571 is connected in a plurality of output ports of 1 * N-port wavelength-selective switches (WSS) 570.As shown in the figure, the quantity of the wavelength of transmission signals (λ) is at most 80 ripples, and the colourless AWG 571 of 1 * 10-port is used as grouping light filter (GF).Give in 10 output ports of colourless AWG 571 each 4 wavelength (4 λ) as one group of assignment, and be used for practical operation to one in these 4 wavelength.

Figure 42 B is the synoptic diagram of the structure when using colourless AWG as the grouping light filter in the inserting side.Give in a plurality of input ports of the colourless AWG 573 of 10 * 1-port each 4 wavelength as one group of assignment, and be used for practical operation to one in these 4 wavelength.The output of colourless AWG573 is connected in a plurality of input ports of N * 1-port wavelength-selective switches (WSS) 574.

Figure 34 P is the figure of another concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 Q is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF1 to 5) shown in Figure 34 P.If the number of wavelengths to the main signal of the core cell 301a of Figure 34 E input is 40 wavelength, then the colourless AWG 345 of 1 * 8-port as the light filter (GF) 341 that divides into groups is connected in 5 ports in 8 output ports of wavelength-selective switches (WSS) 311 each.Different wavelength assignments all output ports to colourless AWG 345, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 40 wavelength of main signal.

Figure 34 R is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 34 E.Figure 34 S is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF2,4,6,8 and 10) shown in Figure 34 R.Figure 34 T is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF1,3,5,7 and 9) shown in Figure 34 R.If the number of wavelengths to the main signal of the core cell 301a of Figure 34 E input is 80 wavelength, then 1 * 2-port photo-coupler 344 is connected in 5 ports in 8 output ports of wavelength-selective switches (WSS) 311 each, and (1 * 8-port) colourless AWG 345a and 345b is connected in two output ports of photo-coupler 344 each.Different wavelength assignments all output ports to colourless AWG 345a and 345b, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 36 Q is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 R is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF1 to 5) shown in Figure 36 Q.If the number of wavelengths to the main signal of the core cell 381a of Figure 36 F input is 40 wavelength, then the colourless AWG 420 of 1 * 8-port as the light filter (GF) 416 that divides into groups is connected in 5 ports in 8 output ports of wavelength-selective switches (WSS) 395 each.Different wavelength assignments all output ports to colourless AWG (CMDX) 420, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 40 wavelength of main signal.

Figure 36 S is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 36 F.Figure 36 T is the synoptic diagram that forms the colourless AWG 420a of the grouping light filter (GF1,3,5,7 and 9) shown in Figure 36 S.Figure 36 U is the synoptic diagram that forms the colourless AWG 420b of the grouping light filter (GF2,4,6,8 and 10) shown in Figure 36 S.If the number of wavelengths to the main signal of the core cell 381a of Figure 36 F input is 80 wavelength, then 1 * 2-port photo-coupler 418 is connected in 5 ports in 8 output ports of wavelength-selective switches (WSS) 395 each, and (1 * 8-port) colourless AWG (CMDX) 420a and 420b is connected in two output ports of corresponding photo-coupler 418 each.Different wavelength assignments all output ports to colourless AWG (CMDX) 420a and 420b, and 3 remaining ports are connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 35 J is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 35 C.Figure 35 K is the synoptic diagram that forms the colourless AWG 374a of the grouping light filter (GF1,3,5,7 and 9) shown in Figure 35 J.Figure 35 L is the synoptic diagram that is used for the colourless AWG 374b of the grouping light filter shown in Figure 35 J (GF2,4,6,8 and 10).If the number of wavelengths to the main signal of the core cell 351a of Figure 35 C input is 80 wavelength, then as in 5 ports in the colourless AWG 374a of 1 * 8-port of light filter (GF) 371a/371b that divides into groups and 8 output ports that 374b is connected to corresponding wavelength-selective switches (WSS) 354a and 354b each.Give all output ports of colourless AWG 374a and 374b different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Figure 37 K is the synoptic diagram of the concrete structure of the optical add/drop multiplexer shown in Figure 37 D.Figure 37 L is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF1,3,5,7 and 9) shown in Figure 37 K.Figure 37 M is the synoptic diagram that forms the colourless AWG of the grouping light filter (GF2,4,6,8 and 10) shown in Figure 37 K.In the structure of Figure 37 D, if the number of wavelengths to the main signal of core cell 431a input is 80 wavelength, then as in 5 ports in the colourless AWG 374c of 1 * 8-port of the light filter (GF) 455 that divides into groups and 8 output ports that 374d is connected to corresponding wavelength-selective switches (WSS) 451 each.Give all output ports of colourless AWG (CMDX) 374c and 374d different wavelength assignments, and each 3 remaining port is connected to the wavelength cross connection device.Can overcome thus and use number of wavelengths quantitative limitation (this is the problem that produces) when using the grouping light filter, and allow to draw the signal corresponding and realize the wavelength cross connection simultaneously with all 80 wavelength of main signal.

Below to using the example of spectrum monitoring device to explain for luminous power control.Figure 43 A is the synoptic diagram of structure that wherein the spectrum monitoring device is used to draw the luminous power control of signal.Core cell 580 comprises 1 * 2 photo-coupler 581, M * 1-port wavelength-selective switches (WSS) 582 and the 1 * N-port wavelength-selective switches (WSS) 583 that is used to draw.In a plurality of output ports of outlet side, be respectively arranged with photo-coupler 584a to 584n.To the optical signal set of 584n branch altogether, and combination optical signal exported to spectrum monitoring device 586 by N * 1 photo-coupler 585 by photo-coupler 584a.The light assembled state of each port of 586 pairs of wavelength-selective switches of spectrum monitoring device (WSS) 583 is regulated, and makes that the luminous power of each port is a desirable value.Can control the luminous power of the light signal of outlet side thus.

Figure 43 B is the synoptic diagram of structure that wherein the spectrum monitoring device is used to draw the luminous power control of signal.Core cell 590 comprises 1 * N-port wavelength-selective switches (WSS), 591,2 * 1 photo-couplers 592 that are used to draw and the M * 1-port wavelength-selective switches (WSS) 593 that is used to insert.In the output port of the main signal side of wavelength-selective switches 591 and outlet side, photo-coupler 594a is set respectively to 594n.To the optical signal set of 594n branch altogether, and combination optical signal exported to spectrum monitoring device 596 by N * 1 photo-coupler 595 by photo-coupler 594a.The light assembled state of each port of 596 pairs of wavelength-selective switches of spectrum monitoring device (WSS) 591 is regulated, and makes that the luminous power in each port is a desirable value.Can control the main signal of outlet side and the luminous power of light signal thus.

Below topology example when having used the core cell of interleaver in expansion explain.Figure 44 is the synoptic diagram that is used to explain the expansion of the core cell that comprises interleaver.Core cell 600a when introducing optical add/drop multiplexer 600 at first switchably is configured in 4 routes (#1 is to #4).

Core cell 600a comprises: 4 50/100GHz interleaver 601a are to 601d, place this core cell 600a and described 4 input sides that route is corresponding; With 4 100/50GHz interleaver 604a to 604d, place the outgoing side of this core cell 600a.Between input side interleaver and outgoing side interleaver, be furnished with 41 * 4-port one 00GHz spacing wavelength-selective switches (WSS) 602a to 602d and 44 * 1-port one 00GHz spacing wavelength-selective switches (WSS) 603a to 603d.According to the switch that each required route is carried out, wavelength-selective switches 602a is interconnected to the input port of wavelength-selective switches 603a to 603d to the output port of 602d.Press the 50GHz spacing to optical add/drop multiplexer 600 input transmission signals or from optical add/drop multiplexer 600 output transmission signals.When the equipment that the introducing message capacity is little at first, core cell 600a uses the operation of even-numbered channels starting outfit.The wavelength spacing of transmission signals in the case is 100GHz.

If message capacity increases, core cell 600b is expanded to realize the function expansion.Core cell 600b comprises: 1 * 4-port one 00GHz spacing wavelength-selective switches (WSS) 610a is to 610d, and its input port is connected to the interleaver 601a of input side of core cell 600a to 601d; With 4 * 1-port one 00GHz spacing wavelength-selective switches (WSS) 611a to 611d, its output port is connected to the interleaver 604a of outgoing side of core cell 600a to 604d.When expanding core cell 600b, core cell 600a handles the even-numbered channels of transmission signals, and core cell 600b handles the odd-numbered channels of transmission signals.According to example based on the expansion of the function of this structure, the cost in the time of can reducing initial introducing.

Below the topology example that wherein inner structure of core cell is split into polylith is explained.Figure 45 A is by the synoptic diagram of the wavelength-selective switches that is positioned at outlet side of discrete one-tenth piece.Core cell 620 comprises 1 * 2 photo-coupler 621 and M * 1 wavelength-selective switches (WSS) 622.In addition, according to allowing the derivative port number of signal, can be connected to core cell 620 to the core block 620a that comprises the 1 * N wavelength-selective switches (WSS) 623 that is used to draw.Thus, can only change this piece according to the wavelength-selective switches 623 whether needs are used to draw.

Figure 45 B is by the synoptic diagram of the wavelength-selective switches that is positioned at the inserting side of discrete one-tenth piece.Core cell 630 comprises 1 * N wavelength-selective switches (WSS) 631 and 2 * 1 photo-couplers 632.In addition, the port number according to allowing signal to be inserted into can be connected to core cell 630 to the core block 630a that comprises M * 1 wavelength-selective switches (WSS) 633 that is used to insert.Thus, can only change this piece according to the wavelength-selective switches 633 whether needs are used to insert.When as explaining in a plurality of upgrading examples in service, carrying out function when expansion, can be the structure of the piece of outlet side that is formed on heart unit or inserting side as core cell.

In these optical add/drop multiplexers, insert the unit or draw the unit be used for insert/or the remaining port of a plurality of ports of drawing as the port of the cross-coupled route of wavelength, but followingly the port extension example (in order to guarantee the route of fixed qty) of WXC route is explained with reference to accompanying drawing.

Figure 46 A is the synoptic diagram that is used to realize the optical add/drop multiplexer according to an embodiment of the invention of wavelength cross connect function.Optical add/drop multiplexer 700a comprises core cell 701a, draws unit 702a and inserts unit 703a.Core cell 701a comprises: 1 * 2 photo-coupler 710a; 1 * 7-port wavelength-selective switches (WSS) 711a that is used to draw is connected in a plurality of outputs of 1 * 2 photo-coupler 710a; And 8 * 1-port wavelength-selective switches (WSS) 712a that is used to insert, be connected to other outputs of 1 * 2 photo-coupler 710a.

1 * 7-port wavelength-selective switches (WSS) 711a with draw unit 702a and be connected, 8 * 1-port wavelength-selective switches (WSS) 712a with insert unit 703a and be connected.In addition, in order to realize wavelength cross connection (WXC), two ports of the input side of two ports of the outgoing side of 1 * 7-port wavelength-selective switches (WSS) 711a and 8 * 1-port wavelength-selective switches (WSS) 712a are connected to other routes (#3, #4).The output port quantity of the input port quantity of the wavelength-selective switches of Figure 46 A (WSS) 712a and wavelength-selective switches (WSS) 711a is the cross-coupled minimum number of wavelength that is used to realize 4 routes.Therefore, can be replaced with another wavelength-selective switches that comprises more port number to these wavelength-selective switches.By required minimum port number configuration all wavelengths selector switch as follows.

Draw unit 702a and comprise a plurality of 1 * 8-port wavelength-selective switches (WSS) 721.Each wavelength-selective switches (WSS) 721 can be drawn into 8 wavelength to wavelength.If like that 40 wavelength (λ 1 to λ 40) are carried out multiplexingly as shown in this embodiment, need 5 wavelength-selective switches (WSS) 721 so to draw light signal with all wavelengths.Draw unit 703a and comprise a plurality of 8 * 1 photo-couplers (CPL) 731 and a plurality of image intensifer 732, with the decay that recovers to cause owing to 8 * 1 photo-couplers (CPL) 731.In this 8 * 1 photo-coupler (CPL) 731, can insert 8 wavelength to each 8 * 1 photo-coupler (CPL) 731, therefore need 58 * 1 photo-coupler (CPL) 731 to have the flashlight of all wavelengths with insertion.Be provided with image intensifer 732 with to amplifying owing to 8 * 1 photo-couplers (CPL) 731 cause the flashlight of decay.

Output port or input port with reference to the wavelength-selective switches that in core cell 701a, is provided with, the insertion of the port of requirement is used port with port with drawing, making needs a port in the time will inserting or draw the flashlight with 8 wavelength, perhaps need two ports in the time will inserting or draw the flashlight with 16 wavelength.Remaining port is used as the wavelength cross connect switch.Therefore, the port number that can insert or draw with required being used to as the port number of WXC changes.In other words, the number of routes amount depends on the number of wavelengths that will insert or draw.

Figure 46 B is the figure that is used to insert unit/draw the channel quantity of unit and is used for the relation between the cross-coupled maximum route quantity of wavelength.The x axle represents to insert/draw the quantity of channel, and the y axle is represented the cross-coupled maximum route quantity of wavelength.Wherein show and inserting unit/the draw value that obtains when using the individual element in 8 * 1 (1 * 8) in the unit.Therefore, the relation of inserting/drawing the quantity of channel and be used between the cross-coupled maximum route quantity of wavelength becomes: [maximum route quantity=(output port of the wavelength-selective switches that is used for drawing of core cell is not used in the output port quantity of inserting)+2].The value on right side "+2 " represents that route #2's passes through (main signal) port (shown in Figure 46 A, main signal by this route #2) and the port of expression route #1 (wherein signal directly not being exported to input port).

Figure 47 and Figure 48 are the synoptic diagram of expansion that is used to explain the routed port of the optical add/drop multiplexer shown in Figure 46 A.In the optical add/drop multiplexer 700c of the optical add/drop multiplexer 700b of Figure 47 and Figure 48, insert the port number that the essential minimum number of branch function is represented the wavelength-selective switches (WSS) of each core cell by being used for realizing optics.Therefore, this quantity depends on extended example and difference.Under actual conditions, optical add/drop multiplexer is used to 1 * 8-port wavelength-selective switches (WSS) of drawing and the 9 * 1-port wavelength-selective switches (WSS) that is used to insert, therefore, dispose optical add/drop multiplexer 700b and optical add/drop multiplexer 700c by identical core cell.

The core cell 701b of the optical add/drop multiplexer 700b of Figure 47 comprises: 1 * 6-port wavelength-selective switches (WSS) 711b that is used to draw, and 5 ports of its outgoing side are connected to draws unit 702a; With 9 * 1-port wavelength-selective switches (WSS) 712b that is used to insert, 5 ports of its input side are connected to and insert unit 703a.Be used for being connected to the quantity of the port of drawing unit 702a and being used for being respectively fixed to 5 ports (for 40 wavelength) from inserting the quantity that unit 703a is connected to the port of 9 * 1-port wavelength-selective switches (WSS) 712b from 1 * 6-port wavelength-selective switches (WSS) 711b.Can draw or insert all flashlights (λ 1 to λ 40) after multiplexing thus.In order to increase the quantity of the port that is used to be connected to route, 1 * 6-port wavelength-selective switches (WSS) 742 (as the expanding element 741 that is used for outputing to route) is connected to of a plurality of outputs of 1 * 6-port wavelength-selective switches (WSS) 711b that is used to draw.In addition, 2 * 1 photo-couplers 752 (as being used for from the expanding element 751 of route input) are connected to 3 ports of the input side of 9 * 1-port wavelength-selective switches (WSS) 712b that is used to insert.

As shown in figure 47, be provided with image intensifer 743 between 1 * 6-port wavelength-selective switches (WSS) 711b and expanding element 741, image intensifer 743 is used to amplify the light signal of waiting to output to route.Yet, also can arbitrary port of a plurality of ports that are used for outputing to route and import, image intensifer 743 be set from route.Therefore, also can between expanding element 751 and 9 * 1-port wavelength-selective switches (WSS) 712b, image intensifer 743 be set.

The core cell 701c of optical add/drop multiplexer 700c comprises: 1 * 8-port wavelength-selective switches (WSS) 711c that is used to draw, and 5 ports of its outgoing side are connected to draws unit 702a; With 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert, 5 ports of its input side are connected to and insert unit 703a.Be used for being respectively fixed to 5 ports (for 40 wavelength) from the quantity that 1 * 8-port wavelength-selective switches (WSS) 711c is connected to the quantity of the port of drawing unit 702a and is used for being connected to from 7 * 1-port wavelength-selective switches (WSS) 712c the port that inserts unit 703a.Can draw or insert all flashlights (λ 1 to λ 40) after multiplexing thus.

In optical add/ drop multiplexer 700c, 31 * 2 photo-couplers 744 as expanding element 741 are connected to 3 ports of the outgoing side of 1 * 8-port wavelength-selective switches (WSS) 711c that is used to draw, and the 6 * 1-port wavelength-selective switches (WSS) 753 as expanding element 751 are connected to of a plurality of inputs of 7 * 1-port wavelength-selective switches (WSS) 712c that is used for inserting.These aspects are different with optical add/drop multiplexer 700b (seeing Figure 47).By using photo-coupler 744, can import unwanted signal light according to route at expanding element 741.Therefore, 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert among the core cell 701c is controlled, to clip unwanted signal light.

As mentioned above, in the extended example of Figure 47 and Figure 48, at the wavelength-selective switches (WSS) that is used to draw and insert that is used for being connected to another route the expanding element (741,751) of route is set, this makes can guarantee 6 independently ports.In other words, how many number of wavelengths that no matter is inserted into or draws is, can dispose the wavelength cross connection of 8 routes all the time.If photo-coupler (744,752) is used for expanding element (741,751), then a plurality of flashlights with same wavelength are carried out multiplexingly, this may cause causing Signal Degrade owing to the light that wherein occurs disturbs.As Figure 47 or shown in Figure 48, if use photo-coupler, only be placed on any one of expanding element 741 that is used for exporting and the expanding element 751 that is used for importing, and wavelength-selective switches (WSS) is arranged in another expanding element (741,751).As mentioned above, when photo-coupler being used for expanding element (741,751), also it is only placed of a plurality of expanding elements of following optical add/drop multiplexer of explaining with reference to accompanying drawing.

Figure 49 is to be used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is added to core cell to Figure 51.Obtain as the core cell (701d, 701e, 701f) of Figure 49 as expanding element 713 by adding 1 * 2 photo-coupler 710b to each optical add/drop multiplexer shown in Figure 51.Photo-coupler 710b is added on the core cell 701a among the optical add/drop multiplexer 700a (seeing Figure 46 A) 1 * 2 photo-coupler 710a to the output of drawing unit 702a and be used for to drawing between 1 * 7-port wavelength-selective switches (WSS) 711a that unit 702a draws signal.

Represent the port number that is used to the wavelength-selective switches (WSS) drawing or insert to the core cell of each optical add/drop multiplexer shown in Figure 51 by the essential minimum number that is used for realizing described function as Figure 49.In actual conditions, optical add/drop multiplexer is used to 1 * 8-port wavelength-selective switches (WSS) of drawing and the 9 * 1-port wavelength-selective switches (WSS) that is used to insert.Therefore, Figure 49 has mutually the same structure to the core cell (701d, 701e, 701f) of Figure 51.Be provided with image intensifer 743 between the expanding element 741 of the expanding element 713 of core cell and route, image intensifer 743 is used to amplify the light signal of waiting to output to route.Can be located at the inserting side of route and any place in the outlet side to this image intensifer 743.

In the optical add/drop multiplexer 700d of Figure 49,1 * 5-port wavelength-selective switches (WSS) 711d that is used for drawing is connected in a plurality of outputs of expanding element 713 of core cell 701d.In addition, 5 ports that are used to the outgoing side of 1 * 5-port wavelength-selective switches (WSS) 711d of drawing are connected to and draw unit 702a.Be connected to the another port of expanding element 713 as one 1 * 2 photo-coupler 744 of the expanding element 741 of route.From inserting 5 input ports that unit 703a connects 8 * 1-port wavelength-selective switches (WSS) 712a that is used to insert, and connect its 2 ports, to form the wavelength cross connection of 4 routes from other routes.

As mentioned above, will be used for being connected to the port of drawing unit 702a separates with the expanding element 741 of the route that is used to be connected to core cell 701d.Separate by this, carry out the increase or the minimizing of the number of wavelengths that is inserted into or draws independently of each other with the increase of cross-coupled route quantity.In addition, photo-coupler 744 is used for expanding element 741, and this situation and the situation of using wavelength-selective switches are compared so that can simplified structure and reduce its cost.In addition, if be necessary, can place the upstream or the downstream of photo-coupler 744 to image intensifer 743 as expanding element 741, the optical loss that causes owing to the expanding element 713 of core cell 701d with compensation.

The optical add/drop multiplexer 700e of Figure 50 comprise with optical add/drop multiplexer 700d (seeing Figure 49) in identical core cell 701e.Yet, the difference of optical add/drop multiplexer 700e is: under the situation of route input signal, 1 * 6-port the wavelength-selective switches 742 that serves as the expanding element 741 of route is connected in a plurality of outputs of expanding element 713, from inserting 5 ports that unit 703a connects the input side of 9 * 1-port wavelength-selective switches (WSS) 712b that is used to insert, its 3 ports are connected with 32 * 1 photo-couplers 752 that serve as expanding element 751.

Dispose the wavelength cross connection of 8 routes in a manner described, and can further increase route quantity.In addition, if be necessary, can place the upstream or the downstream of 1 * 6-port wavelength-selective switches 742 to image intensifer 743 as expanding element 741, the optical loss that causes owing to the expanding element 713 of core cell 701e with compensation.

The optical add/drop multiplexer 700f of Figure 51 comprise with optical add/drop multiplexer 700d (seeing Figure 49) in identical core cell 701f.Yet, the difference of optical add/drop multiplexer 700f is: 1 * 6 photo-coupler (CPL) 745 that serves as the expanding element 741 of route is connected to a port of expanding element 713, from inserting 5 ports that unit 703a connects the input side of 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert, connect an one port from the 6 * 1-port wavelength-selective switches (WSS) 753 that serves as expanding element 751.

Dispose the wavelength cross connection of 8 routes in a manner described.Use the photo-coupler 745 of expanding element 741 may depend on route and import unwanted signal light.Therefore, 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert among the core cell 701f is controlled, to clip unwanted signal light.In addition, compare with 1 * 2 photo-coupler 744 (seeing Figure 49), 1 * 6 photo-coupler (CPL) 745 that is used as the expanding element 741 of route has bigger optical loss.Therefore,, then need image intensifer 743 be set, with the compensation optical loss in the upstream or the downstream of 1 * 6 photo-coupler 745 if require to have the route output level identical with the route output level of optical add/ drop multiplexer 700d and 700e.

If photo-coupler (744,745,752) is used for expanding element (741,751), then a plurality of flashlights with same wavelength are carried out multiplexingly, this may cause causing Signal Degrade owing to the light that wherein occurs disturbs.Therefore, shown in Figure 50 or Figure 51, must in any one of expanding element (741,751), arrange wavelength-selective switches (WSS).

Figure 52 is to be used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when using 1 * 6 photo-coupler at outlet side to Figure 54.Comprise 1 * 6 photo-coupler 745 of the expanding element 713 that also serves as outlet side as Figure 52 to each core cell (701g, 701h and 701i) of the optical add/drop multiplexer shown in Figure 54, and do not comprise 1 * 7-port wavelength-selective switches (WSS) 711a that is used to draw of the core cell 701a among the optical add/drop multiplexer 700a (seeing Figure 46 A).

The port number of each wavelength-selective switches that being used to of each core cell of Figure 52 in the optical add/drop multiplexer of Figure 54 draws and insert is the essential minimum port number that is used to realize function.1 * 8-port wavelength-selective switches (WSS) that use is used to draw and the 9 * 1-port wavelength-selective switches (WSS) that is used to insert are so that can realize identical functions.Therefore, Figure 52 has in fact mutually the same structure to the core cell (701g, 701h, 70li) of Figure 54.In addition, compare with 1 * 2 photo-coupler, 1 * 6 photo-coupler has bigger optical loss.Therefore,, then image intensifer 743 can be placed the input side of each wavelength-selective switches 721 of drawing unit 702a, with the compensation optical loss if be necessary.

In the optical add/drop multiplexer 700g of Figure 52, be fixed for drawing and be connected to as 5 ports of the input side of 1 * 6 photo-coupler 745 of the expanding element 713 that is provided with for drawing of core cell 701g and draw the unit, a remaining port is connected to 1 * 2 photo-coupler 744 as the expanding element 741 of route.At 8 * 1-port wavelength-selective switches (WSS) 712a that is used for inserting,, connect its 2 ports from other routes from inserting 5 ports that unit 703a connects its input side.

Separate from the expanding element 741 of route drawing unit 702a in a manner described, to dispose the wavelength cross connection of 4 routes.By route quantity is limited in 4, under the situation of the wavelength-selective switches (WSS) of the expanding element 741 that does not use route, can form a plurality of routes independently of each other by low cost.

The optical add/drop multiplexer 700h of Figure 53 comprise with optical add/drop multiplexer 700g (seeing Figure 52) in identical core cell 701h.Yet, the difference of optical add/drop multiplexer 700f is: under the situation of route input signal, 1 * 6-port the wavelength-selective switches (WSS) 742 that connects as the expanding element 741 of route from the expanding element that is used to draw 713, from inserting 5 ports that unit 703a connects the input side of 9 * 1-port wavelength-selective switches (WSS) 712b that is used to insert, and its 3 ports are connected with 2 * 1 photo-couplers 752 that serve as expanding element 751.

Dispose the wavelength cross connection of 8 routes in a manner described, and can further increase route quantity.In addition, can place the upstream or the downstream of 1 * 6-port wavelength-selective switches 742 to image intensifer 743 as expanding element 741, the optical loss that causes owing to the expanding element 713 of core cell 701h with compensation.

The optical add/drop multiplexer 700i of Figure 54 comprise with optical add/drop multiplexer 700g (seeing Figure 52) in identical core cell 701i.Yet, the difference of optical add/drop multiplexer 700i is: under the situation of route input signal, 1 * 6 wavelength coupler 745 that connects as the expanding element 741 of route from the expanding element that is used to draw 713, from inserting 5 ports that unit 703a connects the input side of 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert, and an one port is connected with 6 * 1-port wavelength-selective switches (WSS) 753 as expanding element 751.

Dispose the wavelength cross connection of 8 routes in a manner described.Use the photo-coupler 745 of expanding element 741 may depend on route and import unwanted signal light.Therefore, 7 * 1-port wavelength-selective switches (WSS) 712c that is used to insert among the core cell 701i is controlled, to clip unwanted signal light.In addition, if be necessary, can place the upstream or the downstream of 1 * 6 photo-coupler (CPL) 745 to image intensifer 743 as expanding element 741, the optical loss that causes owing to the expanding element among the core cell 70li 713 with compensation

If photo-coupler (744,745,752) is used for expanding element (741,751), then a plurality of flashlights with same wavelength are carried out multiplexingly, this may cause causing Signal Degrade owing to the light that wherein occurs disturbs.Therefore, shown in Figure 53 or Figure 54, must in any one of expanding element (741,751), arrange wavelength-selective switches (WSS).

At Figure 47 in each optical add/drop multiplexer of Figure 53, can be photo-coupler, matrix switch or grouping light filter but not wavelength-selective switches is used to draw unit 702a.In addition, can be wavelength-selective switches, matrix switch or grouping light filter but not photo-coupler is used for insertion unit 703a wherein.

Figure 55 is the synoptic diagram that is used to explain based on the port expansion of the route of ROADM to Figure 56.In all optical add/drop multiplexers of Figure 54, function is based on as the insertion of any wavelength of DOADM with draw at Figure 46 A.Optical add/drop multiplexer 700j and 700k shown in Figure 55 and Figure 56 are formed ROADM, and insert or draw flashlight with fixed wave length.In the case, the fixed wave length device such as AWG is used as the optics demultiplexer that inserts or draw, so that can insert or draw the signal of all wavelengths by individual devices.

Therefore, in structure, can be more a plurality of ports of a plurality of ports of 4 * 1-port wavelength-selective switches (WSS) 712j that is used for inserting among the route assignment core cell 701j based on ROADM.Figure 55 and Figure 56 show the essential minimum port number that is used to realize function.Under actual conditions, optical add/drop multiplexer (700j and 700k) is used to 9 * 1-port wavelength-selective switches (WSS) of inserting.Therefore, dispose the core cell 701j of Figure 55 and the core cell 701k of Figure 56 by identical core cell.

The optical add/drop multiplexer 700j of Figure 55 comprises core cell 701j, draws unit 702j and inserts unit 703j.Core cell 701j comprises: 1 * 2 photo-coupler 710a; 1 * 2 photo-coupler 710b is as a port extension unit 713 that is connected to 1 * 2 photo-coupler 710a and the connection that is used to draw; And 4 * 1-port wavelength-selective switches (WSS) 712j that is used to insert, be connected to other ports of 1 * 2 photo-coupler 710a.The unit 702j that draws that comprises optics demultiplexer 722 is connected to a port as 1 * 2 photo-coupler 710b of expanding element 713, is connected to its another port as 1 * 2 photo-coupler 744 of the expanding element 741 of route.Connect a port of the input side of 4 * 1-port wavelength-selective switches (WSS) 712j be used to insert from the insertion unit 703j that comprises optical multiplexer 733, connect two port from other routes.

Dispose the wavelength cross connection of 4 routes in a manner described.Expanding element 713 among the core cell 701j comes being connected to signal of drawing unit 702j and the Signal Separation that is connected to route.In addition, route is limited in 4,, makes the flashlight of route decay still less to allow realizing function by simple structure.

The optical add/drop multiplexer 700k of Figure 56 comprise with optical add/drop multiplexer 700j (seeing Figure 55) in identical core cell 701k.Yet, the difference of optical add/drop multiplexer 700k is: 1 * 6 photo-coupler (CPL) 745 as the expanding element 741 of route is connected to core cell 701k, from inserting the port that unit 703j connects the input side of 8 * 1-port wavelength-selective switches (WSS) 712a, connect its 6 ports from other routes.

Dispose the wavelength cross connection of 8 routes in a manner described.Use the photo-coupler 745 of expanding element 741 may depend on route and import unwanted signal light.Therefore, 8 * 1-port wavelength-selective switches (WSS) 712a that is used to insert among the core cell 701k is controlled, to clip unwanted signal light.In addition, image intensifer 743 can be set, the optical loss that produces owing to 1 * 6 photo-coupler (CPL) 745 in upstream that places expanding element 741 or downstream with compensation.

As mentioned above, different with structure based on DOADM, the optical add/drop multiplexer 700j of Figure 55 and Figure 56 and 700k only need a port to be used to be connected to the insertion unit and draw the unit, this makes can realize function by low cost, and this is because wavelength-selective switches (WSS) needn't be set for the expanding element 741 of route.In addition, compare with the core cell (701d, 701e, 701f) of optical add/ drop multiplexer 700d, 700e and 700f, the difference of each core cell (701d, 701e, 701f) is: 1 * 5 port wavelength-selective switches (WSS) 711d is added to a port (seeing that Figure 49 is to Figure 51) as the outgoing side of 1 * 2 photo-coupler 710b of the expanding element 713 that is used to draw.Therefore, with reference to go into main signal that go out to transmit to #2 from #1, from the signal of another route input or to the signal of another route output, can under the situation of cut-off signal not, carry out function expansion (upgrading in service) from optical add/drop multiplexer 700j and 700k to optical add/ drop multiplexer 700d, 700e and 700f.

As with reference to Figure 47 in each port extension example of the WXC route of the optical add/drop multiplexer that Figure 56 explained, can fix and guarantee route quantity, under the situation of passing through the path of learning add/drop multiplexer of constantly opening the light, can expand the port of WXC route from input port to the output port process.

Figure 57 is used for the synoptic diagram that explaination is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is added to core cell.Figure 57 shows the core cell of each optical add/drop multiplexer.By adding 1 * 2 coupling mechanism C2 obtains each optical add/drop multiplexer shown in Figure 57 as expanding element 713 core cell.The cells D 1 that coupling mechanism C2 is added on the output of 1 * 2 coupling mechanism C1 and is used for drawing and between each of the cells D 2 of other routes.Represent by the essential minimum number that is used for realizing described function each optical add/drop multiplexer shown in Figure 57 core cell be used to the AWG port number drawing or insert.

In drawing cells D 1, the AWG AWG1 that is used for drawing is connected to of a plurality of outputs of expanding element C2.Each port of the outgoing side of the AWG AWG1 that is used to draw all is connected to the receiver that is used to draw.1 * N WSS WSS1 is connected in a plurality of outputs of expanding element C2.Each port of 1 * N WSS WSS1 all is connected to other routes to form the wavelength cross connection.Wherein, these ports are used to realize carrying out the wavelength cross connection of drawing function.

As mentioned above, separate with the port that is used to be connected to other routes being used to be connected to the port of drawing cells D 1.Separate by this, with the increase of cross-coupled route quantity or reduce increase or the minimizing of carrying out the number of wavelengths that is inserted into or draws independently of each other.In addition, the use of the AWG that is used to draw and insert is made to simplify node configuration and reduce cost.

Figure 58 is used for the synoptic diagram that explanation is expanded the port of the route of optical add/drop multiplexer when 1 * 2 photo-coupler is added to core cell.Figure 58 shows the core cell of each optical add/drop multiplexer.By adding 1 * 2 coupling mechanism C2 obtains each optical add/drop multiplexer shown in Figure 58 as expanding element 713 core cell.Photo-coupler C2 is added on the output of 1 * 2 photo-coupler C1 and draws between among cells D 1 and the D2 each.The port number that is used to the wavelength-selective switches (WSS) drawing or insert of representing the core cell of each optical add/drop multiplexer shown in Figure 2 by the essential minimum number that is used for realizing described function.Under actual conditions, optical add/drop multiplexer is used to the 1 * N-port WSS that draws and the M that is used to insert * 1-port WSS.

Drawing in the cells D 1 shown in Figure 58, the 1 * N port WSSWSS 1 that is used for drawing is connected to of a plurality of outputs of expanding element C2.Each port of the outgoing side of the 1 * NWSS WSS1 that is used to draw all is connected to receiver.1 * N WSS WSS2 is connected in a plurality of outputs of expanding element C2.The certain port of 1 * N WSS WSS2 is connected to the receiver that is used to draw, and other ports are connected to other routes to form the wavelength cross connection.Wherein, these ports are used to realize carrying out the wavelength cross connection of drawing function.

As mentioned above, separate with the port that is used to be connected to other routes being used to be connected to the port of drawing cells D 1.Under the situation of DOADM function, nearly N the required number of signals of drawing can only be prepared 1 * N WSS WSS1.When the required number of signals of drawing when surpassing N, can realize described configuration by dead end mouth from 1 * N WSS WSS2 to other routes that arrange.Can realize and corresponding the drawing and insert structure of required wavelength (port) number by the minimum composition.In addition, by being implemented to the structure of the route of other networks with the proportional minimum composition of quantity required.

As mentioned above, according to optical add/drop multiplexer, in the time will drawing or insert, when initial the introducing, utilize minimum arrangement of components equipment than quantity wavelength.Then, in the time will drawing and insert the increase of a plurality of wavelength and route quantity, add with corresponding being configured to of each situation allowing to carry out the function expansion.In the case, needn't be inserting the unit that unit replacement becomes another transmission signals to pass through.This makes can carry out upgrading in service, under the situation that does not disconnect transmission signals function is expanded.

According to the present invention, can insert the branch function to optics accordingly with the variation of network demand and expand.

Although invention has been described at being used for complete and clear disclosed specific embodiment, but claims are not so limited, but should be interpreted into all modifications example and alternative configuration within the basic instruction that drops on here to be explained that has embodied that those skilled in the art can find.

Claims (35)

1, a kind of optical add/drop multiplexer, be used for switching-over light path and draw or insert channel with predetermined wavelength, this light path is used for the output signal that changes over each wavelength through multiplexing a plurality of wavelength and the input signal that inputs to input port having, this output signal is directed to the output port at a plurality of routes in each transmission path, and this optical add/drop multiplexer comprises:

Core cell comprises:

By the path, make input signal by arriving output port;

Draw port, be used to draw input signal with predetermined wavelength; And

Insert port, be used for inserting described channel to input signal.

2, optical add/drop multiplexer as claimed in claim 1 also comprises:

Be connected to the unit of drawing of drawing port, its at each wavelength to carrying out demultiplexing from drawing the input signal that port draws, and a plurality of signals of forming as the result of demultiplexing of output.

3, optical add/drop multiplexer as claimed in claim 2, wherein:

The described port of drawing is provided with a plurality of;

These a plurality of parts of drawing in the port are connected to draws the unit; And

These a plurality of another part of drawing in the port are connected to a wavelength cross connection portion.

4, optical add/drop multiplexer as claimed in claim 1 wherein, is describedly drawn the output port that port is 1 * N photo-coupler, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output.

5, optical add/drop multiplexer as claimed in claim 1 wherein, is describedly drawn the output port that port is 1 * N wavelength-selective switches, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output.

6, optical add/drop multiplexer as claimed in claim 1 also comprises:

Be connected to the insertion unit that inserts port, it carries out multiplexing at each wavelength to the flashlight with a plurality of wavelength, and this flashlight will be inserted into this insertion unit.

7, optical add/drop multiplexer as claimed in claim 6, wherein:

Described insertion port is provided with a plurality of,

Part in these a plurality of insertion ports is connected to the insertion unit, and

Another part in these a plurality of insertion ports is connected to a wavelength cross connection portion.

8, optical add/drop multiplexer as claimed in claim 1, wherein, described insertion port is the input port of M * 1 photo-coupler, M is the quantity of positive integer and expression input here, the 1st, the quantity of output.

9, optical add/drop multiplexer as claimed in claim 1, wherein, described insertion port is the input port of M * 1 wavelength-selective switches, M is the quantity of positive integer and expression input here, the 1st, the quantity of output.

10, optical add/drop multiplexer as claimed in claim 1, wherein, it is individual that described core cell is provided with the quantity identical with the quantity of route, and

Each core cell all comprises:

Have N 1 * N wavelength-selective switches of drawing port, 1 is the quantity of input here,

N is the quantity of positive integer and expression output; With

Have M M * 1 wavelength-selective switches that inserts port, here M be positive integer also

The quantity of expression input, the 1st, the quantity of output, wherein

A plurality of insertion ports that 1 * N wavelength-selective switches in the core cell in described a plurality of core cell a plurality of draw M * 1 wavelength-selective switches in another core cell in port and the described a plurality of core cells are connected, to be used for the wavelength cross connection.

11, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

1 * N photo-coupler is used for receiving inputted signal and has N output port, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output; With

M * 1 photo-coupler has M input port and input signal is output as output signal, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output;

By the path, it is to form by the input port that an output port with 1 * N photo-coupler is connected to M * 1 photo-coupler; And

Wavelength separator places by the path.

12, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

1 * N photo-coupler is used for receiving inputted signal and has N output port, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output; With

M * 1 photo-coupler has M input port and input signal is output as output signal, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output;

By the path, it is to form by an input port that an output port of 1 * N photo-coupler is connected to M * 1 photo-coupler;

1 * N wavelength-selective switches is connected to an output port of 1 * N photo-coupler and has N and draws port; And

M * 1 wavelength-selective switches is connected to an input port of M * 1 photo-coupler and has M and inserts port.

13, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

1 * N wavelength-selective switches is used for receiving inputted signal and has N output port, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output;

N * 1 photo-coupler has N input port and input signal is output as output signal, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output;

By the path, it is to form by an input port that an output port of 1 * N photo-coupler is connected to N * 1 photo-coupler; And

M * 1 wavelength-selective switches is connected to an input port of N * 1 photo-coupler and has M and inserts port, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output.

14, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

1 * N wavelength-selective switches is used for receiving inputted signal and has N output port, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output;

M * 1 wavelength-selective switches has M input port and input signal is output as output signal, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output; And

By the path, it is to form by an input port that an output port of 1 * N wavelength-selective switches is connected to M * 1 wavelength-selective switches.

15, optical add/drop multiplexer as claimed in claim 1 comprises a pair of interleaver, and this a pair of interleaver is used to change the wavelength spacing of input signal, and is placed in the insertion port and draws in the port.

16, optical add/drop multiplexer as claimed in claim 15, wherein, described core cell comprises:

First core cell, it comprises:

Place the wavelength-selective switches between the described a pair of interleaver, be used for to drawing port output input signal, this input signal of first set of wavelengths have in a plurality of wavelength spacings that change by described interleaver a wavelength spacing and

The wavelength-selective switches that is used for received signal; With

Second core cell that is used to expand, it comprises:

Additionally be connected the wavelength-selective switches between the described interleaver, be used for to drawing port output input signal, this input signal of second set of wavelengths have with change by described interleaver and be input to the identical wavelength spacing of the wavelength spacing of first core cell and

The wavelength-selective switches that is used for received signal.

17, optical add/drop multiplexer as claimed in claim 2, wherein, the described unit of drawing comprises the optics demultiplexer that is used for fixing wavelength and any one in 1 * N wavelength-selective switches, here 1 is the quantity of input, and N is that positive integer and expression are exported, the quantity of grouping light filter, photo-coupler and wave length variable filter.

18, optical add/drop multiplexer as claimed in claim 6, wherein, described insertion unit comprises the optical multiplexer that is used for fixing wavelength and any one in M * 1 wavelength-selective switches, here M is the quantity of positive integer and expression input, the 1st, and the quantity of output, grouping light filter and photo-coupler.

19, optical add/drop multiplexer as claimed in claim 17, wherein, described grouping light filter is an interleaver, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

20, optical add/drop multiplexer as claimed in claim 18, wherein, described grouping light filter is an interleaver, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

21, optical add/drop multiplexer as claimed in claim 17, wherein, described grouping light filter is that band divides a light filter, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

22, optical add/drop multiplexer as claimed in claim 18, wherein, described grouping light filter is that band divides a light filter, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

23, optical add/drop multiplexer as claimed in claim 17, wherein, described grouping light filter is an array waveguide grating, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

24, optical add/drop multiplexer as claimed in claim 18, wherein, described grouping light filter is an array waveguide grating, and when using described grouping light filter the restriction of using number of wavelengths is resolved.

25, optical add/drop multiplexer as claimed in claim 1 comprises the power governor that is used for conditioning signal power, and wherein, this power governor is arranged on by the path, draws at least one in port and the insertion port.

26, optical add/drop multiplexer as claimed in claim 1, wherein, the described port of drawing is provided with a plurality of, these a plurality of at least one of drawing in the port are configured to wavelength cross connection port, and the output that is used to increase port number can be connected to this wavelength cross connection port with expanding element.

27, optical add/drop multiplexer as claimed in claim 1, wherein, described insertion port is provided with a plurality of, in these a plurality of input ports at least one is configured to wavelength cross connection port, and the input that is used to increase port number can be connected to this wavelength cross connection port with expanding element.

28, optical add/drop multiplexer as claimed in claim 26 wherein, is connected with in 1 * N wavelength-selective switches and the photo-coupler any one as described output with expanding element, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output.

29, optical add/drop multiplexer as claimed in claim 27 wherein, is connected with in M * 1 wavelength-selective switches and the photo-coupler any one as described input with expanding element, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output.

30, optical add/drop multiplexer as claimed in claim 28, wherein, described photo-coupler only is arranged on output specially and uses expanding element and import in any one that use in the expanding element.

31, optical add/drop multiplexer as claimed in claim 29, wherein, described photo-coupler only is arranged on output specially and uses expanding element and import in any one that use in the expanding element.

32, optical add/drop multiplexer as claimed in claim 30, wherein, described core cell comprises M * 1 wavelength-selective switches, this M * 1 wavelength-selective switches comprises M input port and input signal is output as output signal, here M is the quantity of positive integer and expression input, the 1st, and the quantity of output.

33, optical add/drop multiplexer as claimed in claim 31, wherein, described core cell comprises M * 1 wavelength-selective switches, this M * 1 wavelength-selective switches comprises M input port and input signal is output as output signal.

34, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

The one 1 * 2 photo-coupler is used for receiving inputted signal and has two output ports;

M * 1 wavelength-selective switches has M input port and input signal is output as output signal, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output;

By the path, it is to form by an input port that an output port of the one 1 * 2 photo-coupler is connected to M * 1 wavelength-selective switches;

The 21 * 2 photo-coupler has two output ports of another output port that is connected to the one 1 * 2 photo-coupler; And

1 * N wavelength-selective switches with N output port is connected to an output port of the 21 * 2 photo-coupler, and 1 is the quantity of input here, and N is the quantity of positive integer and expression output, wherein

Another output port of the 21 * 2 photo-coupler is set as wavelength cross connection port; And

Part in a plurality of input ports of M * 1 wavelength-selective switches is set as wavelength cross connection port.

35, optical add/drop multiplexer as claimed in claim 1, wherein, described core cell comprises:

1 * 2 photo-coupler is used for receiving inputted signal and has two output ports, and 1 is the quantity of input here, and the 2nd, the quantity of output;

M * 1 wavelength-selective switches has M input port and input signal is output as output signal, and M is the quantity of positive integer and expression input here, and the 1st, the quantity of output;

By the path, it is to form by an input port that an output port of 1 * 2 photo-coupler is connected to M * 1 wavelength-selective switches; And

1 * N photo-coupler with N output port, 1 is the quantity of input here, and N is the quantity of positive integer and expression output, and this 1 * N photo-coupler is connected to another output port of 1 * 2 photo-coupler, wherein

An output port of 1 * N photo-coupler is set as wavelength cross connection port, and

Part in a plurality of input ports of M * 1 wavelength-selective switches is set as wavelength cross connection port.

Images