CN1845485A

CN1845485A - System realization method for optical fibre access mixed network

Info

Publication number: CN1845485A
Application number: CN 200610077392
Authority: CN
Inventors: 沈红
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-23
Filing date: 2006-04-23
Publication date: 2006-10-11

Abstract

As there is both WDM-PON and TDM-PON on market, the related scheme, which benefits to them concurrent, comprises: assigning free wavelength of TDM-PON to transmit optical signal of WDM-PON, applying optical filter near fiber line end to make off WDM wavelength and well isolate WDM-PON and TDM-PON, and combining multiple filters to form multi-fiber, multi-protocol fiber access hybrid system.

Description

System's implementation method of optical fibre access mixed network

Technical field:

The present invention relates to network access system, particularly the connecting system of wavelength division multiplexing is used.

Background technology:

Fiber Access System is used more and more widely, and wherein the PON technology is the important composition technology that present optical fiber inserts, and the TDM-PON technology comprises at present: BPON, GE-PON, GPON, x GE-PON etc.; Along with the development of technology and the raising of user bandwidth demand, when providing user bandwidth more than the 100Mb/s, must use new technologies such as WDM-PON as needs, can occur WDM-PON and TDM-PON on the market demand simultaneously and use; But when WDM-PON and TDM-PON application in the past, the light transmission wavelengths of its physical layer has bigger difference, and the network architecture before utilizing can't directly use terminal to replace.Therefore, how the simplest, realize that the network coexisted of WDM-PON and TDM-PON is very important cheaply.

The art of this patent method can well realize that WDM-PON and TDM-PON's is network coexisted.

Summary of the invention:

(1) the untapped wavelength of distribution T DM-PON of the present invention transmits the WDM-PON light signal, and WDM-PON and TDM-PON are distinguished by wavelength; (2) traditional inner filter wide ranges of TDM-PON does not possess the ability that leaches the WDM-PON wavelength; The present invention uses special optical filter, this filter is placed on certain location (near the light terminal), the TDM-PON that makes optical fiber insert center-side mixes end and links to each other with this filter with the mixing end of WDM-PON, filter mixes end and directly is connected with far-end by optical fiber, can reduce so simultaneously and use optical filter quantity; When outputing to the far-end contact after (3) optical filter mixes all downstream wavelength, optical filter can also be delivered to the mixing end that TDM-PON mixes end and WDM-PON to all far-end uplink optical signal respectively by wavelength; (4) after the TDM-PON mixing end of optical fiber access center-side enters the TDM-PON optical interface, handle and distinguish inner each user of TDM-PON by each corresponding protocol of TDM-PON (as BPON, EPON, GPON etc.) and insert transfer of data; (5) the mixing end of the WDM-PON of optical fiber access center-side is distinguished each wavelength user by the wavelength division multiplex device of the original technology of WDM-PON, realizes each wavelength user's message transmission.

Description of drawings:

As Fig. 1 is the performance parameter and the connection layout of specific light filter 3 (not containing CATV uses); It is the TDM-PON wave-length coverage that 1-divides the wave-length coverage of port; It is the WDM-PON wave-length coverage that 1-divides the wave-length coverage of port; The compound port wave-length coverage of 0-adds the WDM-PON wave-length coverage for the TDM-PON wave-length coverage;

As Fig. 2 is the performance parameter and the connection layout of specific light filter 3 (containing CATV uses); It is the TDM-PON wave-length coverage that 1-divides the wave-length coverage of port; It is the WDM-PON wave-length coverage that 1-divides the wave-length coverage of port; The compound port wave-length coverage of 0-adds the WDM-PON wave-length coverage for the TDM-PON wave-length coverage;

As Fig. 3 is fiber access device WDM-PON and the Organization Chart that links that mixes of TDM-PON; Unit 1 is the unit of TDM-PON center-side; Unit 2 is the unit of WDM-PON center-side; Unit 3 is for distinguishing the optical filter of WDM-PON and TDM-PON wavelength; Unit 4 is the distal fiber distribution network, and the WDM-PON user of all existence of far-end and TDM-PON are with being attached thereto per family;

As Fig. 4 is to contain the fiber access device WDM-PON of image intensifer unit 31 and the Organization Chart that links that mixes of TDM-PON; The WDM of this system is divided into a plurality of wavestrips and is used by far-end WDM-PON user simultaneously; Unit 1 is the unit of TDM-PON center-side; Unit 2-1 is the unit of WDM-PON center-side; Unit 2-2 is the unit of WDM-PON center-side; The WDM-PON of unit 2-1 and unit 2-2 takies different wavelength bands respectively; Unit 3 is for distinguishing the optical filter of WDM-PON and TDM-PON wavelength; Unit 4 is the distal fiber distribution network, and the WDM-PON user of all existence of far-end and TDM-PON are with being attached thereto per family; Far-end WDM user is divided into two groups, and one group is WDM user 1-1～WDM user 1-n, and another group is WDM user 2-1～WDM user 2-n;

As Fig. 5 is the structure that contains the WDM-PON center-side OLT of CATV; Unit 21 is a data processing circuit, handles all access user datas; Unit 22-1 ~ 22-n is the light Transmit-Receive Unit of respective wavelength among the WDM-PON; Unit 23 is WDM channel-splitting filter/wave multiplexer; Unit 24 is thick interleaver, is used for synthetic and differentiation data and CATV service wavelength;

As Fig. 6 is the structure that does not contain the WDM-PON center-side OLT of CATV; Unit 21 is a data processing circuit, handles all access user datas; Unit 22-1 ~ 22-n is the light Transmit-Receive Unit of respective wavelength among the WDM-PON; Unit 23 is WDM channel-splitting filter/wave multiplexer; Unit 25 is the image intensifer unit;

Use the structure (not containing CATV) of the WDM-PON center-side OLT of different wave length for WDM user as Fig. 7; Unit 21 is a data processing circuit, handles all access user datas; Unit 22-1 ~ 22-n light transmitting element is respectively the light transmitting element of a descending n different wave length among the WDM-PON, unit 22-1 ~ 22-n light receiving unit is respectively the light receiving unit of a up n different wave length among the WDM-PON, and the light of same transmission receiving element sends different with the wavelength of light-receiving; Unit 23 is WDM channel-splitting filter/wave multiplexer, and it comprises three internal elements such as 23-1,23-2,23-3;

Insert and fiber distribution figure for the distal fiber user as Fig. 8;

Unit

4,5,6 has constituted a basic distal fiber distribution network; Unit 4 is an optical filter, and it can distinguish the wavelength of WDM-PON and TDM-PON; Unit 5 is distributed to each user to the TDM-PON light signal by luminous power for the optical splitter that TDM-PON needs; Channel-splitting filter/wave multiplexer that unit 6 needs for WDM-PON; Handle all access user datas;

Insert and fiber distribution figure for the distal fiber user as Fig. 9:

unit

4,5,6 has constituted a basic distal fiber distribution network; Unit 4 is an optical filter, and it can distinguish the wavelength of WDM-PON and TDM-PON; Unit 5 is distributed to each user to the TDM-PON light signal by luminous power for the optical splitter that TDM-PON needs; Unit 6-1, unit 6-2 are respectively channel-splitting filter/wave multiplexer that 1 group of WDM-PON needs, according to the position difference can WDM be divided into two groups and more than; The fiber distribution network inserts all users;

Insert and fiber distribution figure for the distal fiber user as Figure 10;

Unit

4,5,6-2,6-2-1 have constituted a basic distal fiber distribution network; Unit 4 is an optical filter, and it can distinguish the wavelength of WDM-PON and TDM-PON; Unit 5 is distributed to each user to the TDM-PON light signal by luminous power for the optical splitter that TDM-PON needs; Unit 6-2 is channel-splitting filter/wave multiplexer that WDM-PON needs; Unit 6-2-1 is the optical splitter that satisfies the TDM-PON needs of WDM wavelength, inserts the TDM-PON user of this wavelength;

As Figure 11 is that many optical fiber that a plurality of WDM-PON OLT and TDM-PON OLT insert insert the center-side equipment drawing, and each optical fiber all connects and contains WDM and TDM-PON user's access;

As Figure 12 is that many optical fiber that a plurality of WDM-PON OLT and TDM-PON OLT insert insert the center-side equipment drawing, and in all optical fiber, some is that pure WDM optical fiber inserts, and some is that pure TDM-PON optical fiber inserts, and some inserts for containing WDM and TDM-PON optical fiber simultaneously; Might be the GPON agreement in the TDM-PON agreement, also might be BPON agreement or other PON agreement, also may in system equipment, have a plurality of PON agreements simultaneously.

Claims

1. system's implementation method that can realize the coexistence of time division multiplexing light passive network (TDM-PON) and wavelength division multiplexed network (WDM-PON), this systems approach comprises:

A) use the unappropriated optical wavelength range of TDM-PON to use range of choice as the optical wavelength of WDM-PON;

B) optical fiber inserts the center-side use specific optical filter, and this filter is divided into compound end and Zhi Luduan.Above-mentioned filter branches port comprises two at least, one of them tributary port is the complex light port of total filter range of a plurality of wavelength different with the TDM-PON wavelength, that have WDM-PON for the optical port of the optical wavelength filter range of output TDM-PON, another tributary port; Simultaneously, the compound port of above-mentioned filter comprises one at least, and the wavelength filtering scope of this compound port comprises the optical wavelength range of TDM-PON and many optical wavelength range of corresponding WDM-PON;

C) the optical fiber existing TDM-PON optical input (or delivery outlet) that inserts center-side is connected with the light tributary port of the TDM-PON filter range of above-mentioned optical filter;

D) the optical fiber WDM-PON optical input (or delivery outlet) that inserts center-side is connected with the light tributary port that the WDM-PON filter range of above-mentioned optical filter adapts;

E) the above-mentioned specific compound port of optical filter sends light signal and the light signal that receives from the far-end network user by optical fiber to the user of far-end network.

2. system's implementation method of right 1 also further is included in the method that distant-end node is realized the light shunt (photosynthetic road) that multiple PON inserts, and is specially:

A) insert far-end at optical fiber and use specific optical filter, this filter is divided into compound end and Zhi Luduan.Above-mentioned filter branches port comprises two at least, one of them tributary port is the complex light port of total filter range of a plurality of wavelength different with the TDM-PON wavelength, that have WDM-PON for the optical port of the optical wavelength filter range of output TDM-PON, another tributary port; Simultaneously, the compound port of above-mentioned filter comprises one at least, and the wavelength filtering scope of this compound port comprises the optical wavelength range of TDM-PON and many optical wavelength range of corresponding WDM-PON;

B) insert the total point of interface of distal fiber at optical fiber, use the photoreactivation port of above-mentioned optical filter to be connected with center-side direction optical fiber, the tributary port of the WDM-PON optical wavelength range of above-mentioned optical filter is connected with the photoreactivation port of WDM-PON wavelength distant-end node;

C) use the TDM-PON tributary port of above-mentioned optical filter to be connected with optical splitter (splicer) the photoreactivation port of TDM-PON far-end;

D) a plurality of partial wave long ports of above-mentioned WDM-PON distant-end node connect by optical fiber, realize at least one user's of optical fiber access;

E) the branch port of the optical splitter of above-mentioned TDM-PON (splicer) is connected with multiple users by optical fiber.

3. in system's implementation method of right 1, WDM-PON inserts user's up-downgoing wavelength, can use identical wavelength or different wavelength.

4. in system's implementation method of right 2, the photoreactivation port of the WDM-PON wavelength distant-end node of the optical filter that it is specific can directly link to each other with the compound end of channel-splitting filter (wave multiplexer).

5. in system's implementation method of right 2, in a plurality of partial wave long ports of WDM-PON distant-end node, comprise 1 port at least, this port is connected with optical splitter (splicer), the branch port of optical splitter (splicer) is connected with multiple users by optical fiber, forms the working method that WDM adds TDM.

6. can realize TDM-PON and the network coexisted Fiber Access System of WDM-PON for one kind, the principal character of its Fiber Access System center-side equipment comprises:

A) there is the optical link access function plate (WDM-PON OLT) of at least one wavelength division multiplexing in center-side equipment, or has the interlock circuit of the optical link access function of realizing wavelength division multiplexing;

B) there is at least one time-multiplexed optical link access function plate (TDM-PON OLT) in center-side equipment, or has the interlock circuit of realizing time-multiplexed optical link access function;

C) there is 1 optical filter in center-side equipment, and this filter can be not belonging to that all specific wavelength WDM insert but belonged to all wavelengths scope that TDM-PON (as GPON etc.) system using and isolate 1 branch port that outputs to optical filter; Simultaneously, this optical filter can also provide the input/output end port of the wavelength of other specific wavelength WDM access, and the wavelength pass band scope of this port is not overlapping with the TDM-PON wave-length coverage.

7. the Fiber Access System center-side equipment described of right 6, it constitutes to describe and further comprises:

A) to time-multiplexed each optical link access function plate (TDM-PON OLT) or each optical link access unit, its use agreement can be to comprise in all time division multiplexing light passive networks such as BPON, GPON, EPON, GE-PON, 10GE-PON any one or more; Simultaneously, when having a plurality of optical link access function plates or optical link access unit, optical link access function plate separately or optical link access unit can select identical or different agreement to use;

B) wavelength division multiplexed network circuit access function plate or realize the interlock circuit unit of time-multiplexed optical link access function can form the nonoverlapping subsystem element of one or more its wavelength for a plurality of.

8. the Fiber Access System of aforesaid right 6, the principal character of its Fiber Access System center-side equipment further comprises:

A) there are a plurality of above-mentioned optical filters;

B) fiber access device has compound input (output) port of a plurality of optical fiber.

9. the Fiber Access System of aforesaid right 6, its Fiber Access System center-side unit includes optical signal amplifier further, realizes the optical signal amplifier ability; The image intensifer kind that it uses can be types such as EDFA, SOA, but is not limited in these types.