CN202435547U

CN202435547U - Passive optical network adopting SFF (small form factor) ONU (optical network unit) optical module

Info

Publication number: CN202435547U
Application number: CN2012200200875U
Authority: CN
Inventors: 赵其圣; 何鹏; 杨思更; 张强
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2012-01-17
Filing date: 2012-01-17
Publication date: 2012-09-12
Anticipated expiration: 2022-01-17

Abstract

The utility model discloses a passive optical network adopting an SFF (small form factor) ONU (optical network unit) optical module. The passive optical network comprises an OLT (optical line terminal) optical module at the local side and an ONU optical module at the client side; the ONU optical module is subjected to SFF encapsulation; a laser in the ONU optical module is an FP injection locking laser; the passive optical network also comprises a circulator; and each port of the circulator is connected with a seed light source, a first spectrometer and a second spectrometer respectively and further connected with the ONU optical module through the first spectrometer and connected with the OLT optical module through the second spectrometer. The passive optical network realizes wavelength division multiplexing through the circulator and the injection locking laser arranged in the ONU optical module, is easily and flexibly networked, and has low complexity in network management and low cost.

Description

A kind of EPON that adopts SFF ONU optical module

Technical field

The utility model relates to the optical communication technique field, specifically, relates to a kind of EPON, more particularly, relates to a kind of EPON of the SFF of employing ONU optical module.

Background technology

EPON (PON) is a kind of Optical Fiber Transmission and access technology of point-to-multipoint; Originate from the mid-90; BPON (BPON), EPON (ethernet passive optical network), GPON networks such as (gigabit passive optical networks) have progressively appearred in the evolution along with the PON technology.EPON has obtained development rapidly because it is broadband, service integrationization, advantage such as networking capability, low cost flexibly.

Above-mentioned PON network all is to adopt the time division multiple access multiplex technique.Time division multiplexing is to make all user's share of bandwidth, for example, if 32 tunnel time division multiplexinges are arranged, is equivalent to each road and only accounts for 1/32 of bandwidth, and the bandwidth that the user can use is less; And because the descending employing broadcast mode of time division multiplexing, signal security property is poor.As a kind of more excellent optical-fiber network, be considered to the developing direction of PON of future generation based on the PON network of wavelength division multiple access multiplex technique.Adopt in the multiplexing optical-fiber network of wavelength division multiple access, can be each user and distribute an independently wavelength, wavelength is different between each user, therefore, user bandwidth can be provided.But adopt the multiplexing PON network of wavelength division multiple access to exist the bottleneck of following its development of obstruction at present: if 1. use the optical assembly with wavelength selection function, prices are rather stiff, uses in ONU (optical network unit) optical module that is not suitable at user side; 2. if distribute a fixed wave length for each ONU optical module, then need be for each user select an optical module with specific reception wavelength, not only networking is complicated, and can increase sizable management cost.

Summary of the invention

The utility model is to the existing above-mentioned technical problem that exists based on the PON network of wavelength division multiple access multiplex technique; A kind of EPON of the SFF of employing ONU optical module is provided; This EPON is through circulator and be arranged on the injection locking laser realization wavelength division multiplexing in the ONU optical module; Networking is simple, flexible, and the network management complexity is low, cost is low.

For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:

A kind of EPON that adopts SFF ONU optical module comprises OLT optical module that is arranged on local side and the ONU optical module that is arranged on client, and the ONU optical module adopts the SFF encapsulation; Laser in the ONU optical module is a FP injection locking laser; Said EPON also includes circulator; First port of circulator connects seed light source, and second port of circulator connects first spectrometer, and then connects the ONU optical module through first spectrometer; The 3rd port of circulator connects second spectrometer, and then connects the OLT optical module through second spectrometer.

Aforesaid EPON, said first spectrometer preferably adopts waveguide array grating to realize, and said client includes at least two ONU optical modules, and each ONU optical module connects one of them channel of waveguide array grating respectively.

Aforesaid EPON, said second spectrometer also preferably adopts waveguide array grating, and said local side includes at least two OLT optical modules, and each OLT optical module connects one of them channel of waveguide array grating respectively.

Aforesaid EPON, said seed light source are any in the spontaneous radiation wide range light (ASE) of super-radiance light emitting diode (SLD) or EDFA Erbium-Doped Fiber Amplifier (EDFA).

Aforesaid EPON, for realizing spectrometer multiplexing to network uplink signal and downstream signal, said first spectrometer also passes through optical cable and directly connects said second spectrometer.

Aforesaid EPON, the signal when avoiding spectrometer multiplexing is chaotic, and the uplink optical signal of said EPON is the light signal of C-band, and the downlink optical signal of said EPON is the light signal of L-band.

Aforesaid EPON; Also can adopt following proposal to realize the down link of network: said EPON also comprises the 3rd spectrometer of the ONU optical module that connects said client; And the 4th spectrometer that connects the OLT optical module of said local side, the 3rd spectrometer is connected through optical cable with the 4th spectrometer.

Aforesaid EPON, said the 3rd spectrometer preferably adopts waveguide array grating, and said client includes at least two ONU optical modules, and each ONU optical module connects one of them channel of waveguide array grating respectively.

Aforesaid EPON, said the 4th spectrometer preferably adopts waveguide array grating, and said local side includes at least two OLT optical modules, and each OLT optical module connects one of them channel of waveguide array grating respectively.

Compared with prior art; The advantage of the utility model with good effect is: EPON is taken into account the up link of the injection locking laser framework network that is arranged in the ONU optical module through circulator, the beam split that is connected with circulator; ONU optical module uplink optical signal is modulated at the wavelength division multiplexing of realizing optical-fiber network in the fixed wave length that distributes through seed light source and spectrometer; The used a plurality of different wave lengths of wavelength division multiplexing do not need ONU optical module or OLT optical module to distribute or are selected; Thereby client can directly adopt a plurality of identical ONU optical modules, thereby simplified the EPON group-network construction, improved networking flexibility property; Reduce the network management complexity, reduced the cost of whole EPON.

After the embodiment in conjunction with advantages the utility model, other characteristics of the utility model and advantage will become clearer.

Description of drawings

Fig. 1 is the network architecture sketch map that the utility model adopts an embodiment of EPON of SFF ONU optical module;

Fig. 2 is the network architecture sketch map that the utility model adopts another embodiment of EPON of SFF ONU optical module.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the utility model is carried out detailed description.

Please refer to Fig. 1, this Fig. 1 shows the network architecture sketch map of an embodiment of the utility model EPON, and the EPON ONU optical module of this embodiment adopts the SFF encapsulation.

As shown in Figure 1, the EPON of this embodiment comprises n the OLT optical module that is arranged on local side, i.e. OLT111 to OLT11n, and n the ONU optical module that is arranged on client, i.e. and ONU171 to ONU17n, n is the natural number greater than 1.Wherein, the structure of n ONU optical module is all identical, and the laser in each ONU optical module all adopts FP injection locking laser.This EPON also includes circulator 14 and first spectrometer 16 and second spectrometer 12; First port one of circulator 14 connects seed light source 13; Its second port 2 connects first spectrometer 16, and then is connected to n ONU optical module 171 to 17n through first spectrometer 16; The 3rd port 3 of circulator 14 connects second spectrometer 12, and then connects n OLT optical module 111 to 11n through second spectrometer 12.

In this embodiment, circulator 14, first spectrometer 16, second spectrometer 12 and the up link of EPON that has been arranged on injection locking laser framework in each ONU optical module.Through selecting suitable seed light source 13; As the ASE of SLD or EDFA that can launch wide range light is as seed light source; The wide range seed light source will get into from first port one of circulator 14; From its second port, 2 outputs, be partitioned into the narrow band light of different wave length then through first spectrometer 16, inject the input light of the injection locking laser of each ONU optical module respectively as laser.Because the injection locking laser is under the excitation that input light is arranged, its output wavelength will be locked in input wavelength, therefore, can the upward signal that the ONU optical module will be launched be modulated in the injection locking laser and export.The light of ONU output is exported from the 3rd port 3 of circulator 14 then, and then is got in the corresponding OLT optical module through second spectrometer 12 through second port 2 of first spectrometer, 16 back entering circulators 14.Owing to distributed a fixed wave length for each ONU optical module through the seed light source 13 and first spectrometer 16; And the wavelength of different ONU optical modules can not conflict, and therefore, can realize the wavelength division multiplexing of up link; And the used a plurality of different wave lengths of wavelength division multiplexing do not need ONU optical module or OLT optical module to distribute or selected; Thereby client can directly adopt a plurality of identical ONU optical modules, thereby simplified the EPON group-network construction, improved networking flexibility property; Reduce the network management complexity, reduced the cost of whole EPON.

In this embodiment, first spectrometer 16 also directly is connected through optical cable 15 with second spectrometer 12, constitutes the down link of EPON, thereby realizes the transmission of network uplink and downstream signal through multiplexing first spectrometer 16 and second spectrometer 12.Under the multiplexing applied environment of this spectrometer, the signal when avoiding spectrometer multiplexing is chaotic, and the uplink optical signal of this embodiment EPON is selected the light signal of C-band for use, and its downlink optical signal is selected the light signal of L-band for use.

In this embodiment, first spectrometer, the 16 preferred waveguide array gratings that adopt realize that like this, each ONU optical module of client connects one of them channel of waveguide array grating respectively.And second spectrometer 12 also preferably adopts waveguide array grating, and each OLT optical module connects one of them channel of waveguide array grating respectively.

Please refer to Fig. 2, this is shown in Figure 2 to be the network architecture sketch map of another embodiment of the utility model EPON, and the EPON ONU optical module of this embodiment also adopts the SFF encapsulation.

As shown in Figure 2, the EPON of this embodiment comprises n the OLT optical module that is arranged on local side, i.e. OLT211 to OLT21n, and n the ONU optical module that is arranged on client, i.e. and ONU261 to ONU26n, n is the natural number greater than 1.Wherein, the structure of n ONU optical module is all identical, and the laser in each ONU optical module all adopts FP injection locking laser.This EPON also includes circulator 24 and first spectrometer 25 and second spectrometer 22; First port one of circulator 24 connects seed light source 23; Its second port 2 connects first spectrometer 25, and then is connected to n ONU optical module 261 to 26n through first spectrometer 25; The 3rd port 3 of circulator 24 connects second spectrometer 22, and then connects n OLT optical module 211 to 21n through second spectrometer 22.

Similar with first embodiment of Fig. 1, in this embodiment, circulator 24, first spectrometer 25, second spectrometer 22 and the up link of EPON that has been arranged on injection locking laser framework in each ONU optical module.Through selecting suitable seed light source 23; As the ASE of SLD or EDFA that can launch wide range light is as seed light source; The wide range seed light source will get into from first port one of circulator 24; From its second port, 2 outputs, be partitioned into the narrow band light of different wave length then through first spectrometer 25, inject the input light of the injection locking laser of each ONU optical module respectively as laser.Because the injection locking laser is under the excitation that input light is arranged, its output wavelength will be locked in input wavelength, therefore, can the upward signal that the ONU optical module will be launched be modulated in the injection locking laser and export.The light of ONU output is exported from the 3rd port 3 of circulator 24 then, and then is got in the corresponding OLT optical module through second spectrometer 22 through second port 2 of first spectrometer, 25 back entering circulators 24.Owing to distributed a fixed wave length for each ONU optical module through the seed light source 23 and first spectrometer 25; And the wavelength of different ONU optical modules can not conflict, and therefore, can realize the wavelength division multiplexing of up link; And the used a plurality of different wave lengths of wavelength division multiplexing do not need ONU optical module or OLT optical module to distribute or selected; Thereby client can directly adopt a plurality of identical ONU optical modules, thereby simplified the EPON group-network construction, improved networking flexibility property; Reduce the network management complexity, reduced the cost of whole EPON.

In this embodiment; For realizing the down link of network; EPON also includes the 3rd spectrometer 27 of the ONU optical module 261 to 26n that connects client; And the 4th spectrometer 28, the three spectrometers 27 that connect the OLT optical module 211 to 21n of local side are connected through optical cable 29 with the 4th spectrometer 28.Because up link has adopted first spectrometer 25 and second spectrometer 22, down link has adopted the 3rd spectrometer 27 and the 4th spectrometer 28, and therefore, upward signal can adopt identical wave band and can not cause crosstalking of signal with downstream signal.

With Fig. 1 embodiment, in the embodiment of this Fig. 2, first spectrometer 25 and the 3rd spectrometer 27 preferred waveguide array gratings that adopt realize that like this, each ONU optical module of client connects one of them channel of waveguide array grating respectively.And second spectrometer 22 and the 4th spectrometer 28 also preferably adopt waveguide array grating, and each OLT optical module connects one of them channel of waveguide array grating respectively.

Above embodiment only in order to the technical scheme of explanation the utility model, but not limits it; Although the utility model has been carried out detailed explanation with reference to previous embodiment, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of relevant art scheme break away from the spirit and the scope of the utility model technical scheme required for protection.

Claims

1. an EPON that adopts SFF ONU optical module comprises OLT optical module that is arranged on local side and the ONU optical module that is arranged on client, and the ONU optical module adopts the SFF encapsulation; It is characterized in that; Laser in the ONU optical module is a FP injection locking laser, and said EPON also includes circulator, and first port of circulator connects seed light source; Second port of circulator connects first spectrometer; And then through first spectrometer connection ONU optical module, the 3rd port of circulator connects second spectrometer, and then connects the OLT optical module through second spectrometer.

2. EPON according to claim 1 is characterized in that, waveguide array grating is counted in said first beam split, and said client includes at least two ONU optical modules, and each ONU optical module connects one of them channel of waveguide array grating respectively.

3. EPON according to claim 2 is characterized in that, waveguide array grating is counted in said second beam split, and said local side includes at least two OLT optical modules, and each OLT optical module connects one of them channel of waveguide array grating respectively.

4. EPON according to claim 1 is characterized in that, said seed light source is any in the spontaneous radiation wide range light of super-radiance light emitting diode or EDFA Erbium-Doped Fiber Amplifier.

5. according to each described EPON in the claim 1 to 4, it is characterized in that said first spectrometer also directly connects said second spectrometer through optical cable.

6. EPON according to claim 5 is characterized in that, the uplink optical signal of said EPON is the light signal of C-band, and the downlink optical signal of said EPON is the light signal of L-band.

7. EPON according to claim 1; It is characterized in that; Said EPON also comprises the 3rd spectrometer of the ONU optical module that connects said client, and the 4th spectrometer that connects the OLT optical module of said local side, and the 3rd spectrometer is connected through optical cable with the 4th spectrometer.

8. EPON according to claim 7 is characterized in that, waveguide array grating is counted in said the 3rd beam split, and said client includes at least two ONU optical modules, and each ONU optical module connects one of them channel of waveguide array grating respectively.

9. EPON according to claim 8 is characterized in that, waveguide array grating is counted in said the 4th beam split, and said local side includes at least two OLT optical modules, and each OLT optical module connects one of them channel of waveguide array grating respectively.