CN101127571A - A public light source shared by WDM-PON system and method for light source sharing - Google Patents
A public light source shared by WDM-PON system and method for light source sharing Download PDFInfo
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Abstract
The utility model discloses a common light source shared by the wavelength division multiplexing passive optical network WDM-PON system, comprising a broadband light source used to produce the wide spectrum light and then output the wide spectrum light to the optical splitter; an optical splitter used to split the wide spectrum light of the broadband light source into a plurality of same wide spectrum lights. The utility model overcomes the insufficiency of the prior art and adopts the technical proposal that the broadband light source produces the wide spectrum light and then the light is filtered by the optical band pass filter, after amplified by the amplifier the light is input into the optical splitter to be divided into a plurality of same wide spectrum light, and then is output into each WDM-PON system. The utility model provides a low cost light source solution reducing the application cost of the WDM-PON and adopts the simple synchronous and dispatch mechanisms facilitating the realization and application of the system.
Description
Technical field
The present invention relates to Wave division multiplexing passive optical network (WDM-PON) technical field, specifically, relate to the technology of the light source among the WDM-PON.
Background technology
Along with the increase of user to the demand of large-data operation, as high definition digital television (HDTV, High-definition digital television), video request program (VoD, Video on Demand) etc., the bandwidth demand that consumer wideband inserts will reach 100Mbps even higher, can't meet the demands with existing xDSL (Digital Subscriber Line), HFC (Hybrid Fiber-Coax, hybrid fiber coax), LAN (Local AreaNetwork, local area network (LAN)) access way.
On the other hand, increasingly mature along with Fibre Optical Communication Technology, the declining to a great extent of costs such as optical fiber, optical device, optical fiber obtains the favor of increasing telecom operators because of its huge bandwidth capacity, increases rapidly with the demand of optical fibre installation Access Network.
In Optical Access Network, be focus especially with EPON (PON), EPON be a kind of be both to have satisfied the new business bandwidth demand, economy, O﹠M user access networks simply and easily again.The network configuration of PON as shown in Figure 1, comprise the optical line terminal (OLT that is positioned at central office (central office), Optical Line Terminal), an optical distribution network (ODN, Optical Distribution Network) and many optical network units (ONU, Optical Network Unit).Difference according to specific implementation, PON can be divided into based on the WDM-PON of the ATM-PON of ATM (Asynchronous Transfer Mode, asynchronous transfer mode), the EPON (Ethernet PON) based on Ethernet, the GPON with gigabit speed, employing wavelength division multiplexing, the OCMDA-PON of employing CDMA.
Wavelength-division multiplex system (WDM-PON) is because the Information Security of its huge bandwidth capacity, similarity point to-point communication, advantage such as network configuration has caused extensive concern simply, but the WDM-PON network is to lasing light emitter, modulator, array waveguide grating (AWG, Array Wavelength Grating) etc. require very high, cost is high always, becomes to hinder its bottleneck of applying.
In order to reduce the light source cost of WDM-PON system, simultaneously for colourlessization that realize ONU promptly with concrete Wavelength-independent, present a kind of relatively mainstream solution is to adopt wide spectrum light source and lock glistening light of waves source, as shown in Figure 2, there are two wide spectrum light sources the central office, be respectively wide spectrum light source 1 and wide spectrum light source 2, satisfy FSR (the free spectral range of the Free Spectrum Range) relation of multiplexing demultiplexing device between the two, these two wide spectrum light sources are respectively each lock glistening light of waves source seed light source are provided through after the spectral line dividing function of multiplexing demultiplexing device; Wherein wide spectrum light source 1 provides seed light source for each the descending lock glistening light of waves source on the OLT, and wide spectrum light source 2 provides seed light source for the up lock glistening light of waves source of each ONU.Lock glistening light of waves source wherein can be reflection type semiconductor image intensifer (RSOA) or injection locking F-PLD.
In actual applications,, need image intensifer that the luminous power of wide spectrum light source is amplified, satisfy the minimum incident optical power requirement in lock glistening light of waves source, thereby cause the rising on the cost because the power ratio of wide spectrum light source is less.In addition, these two wide spectrum light sources and image intensifer are confined to same WDM-PON network and share, so sharing degree is not high.
In order to realize WDM-PON system cheaply, also adopt a kind of technical scheme of tunable laser in the prior art, the WDM-PON system of tunable laser as shown in Figure 3, the downlink data that Data Control Center identification on the ONU receives is wavelength control message or down user data, if receive wavelength control message from OLT, then the emission wavelength of tunable optical transmitter module is adjusted on the wavelength of appointment in the wavelength control message by the wavelength control center, thus colourlessization of realization ONU.
Tunable laser in the such scheme is owing to need attached auxilliary equipment such as temperature control, wavelength calibration device, so its cost descends and not obvious.
In order further to improve the sharing degree of light source, thereby reduce the light source cost, also have a kind of light source solution that adopts the multiple-wavelength laser that wavelength division multiplexing combines with Time Division Multiplexing in the prior art, as shown in Figure 4.In this solution, the WDM-TDM multiple-wavelength laser constantly produces different wavelength of laser according to the mode of time-division, after amplifying through branch then, for the external modulator of each WDM-PON provides lasing light emitter, external modulator must be entered the data-modulated of different user in the different time according to the wavelength change of WDM-TDM multiple-wavelength laser.
This solution needs strict synchronization mechanism and complicated multiplexing scheduling mechanism, and because different wavelength is with the shared multiple-wavelength laser of the mode of TDM, require very high switching time to multiple-wavelength laser, cause multiple-wavelength laser cost costliness, in addition, along with number of users is the increase of number of wavelengths and user bandwidth demand, multiple-wavelength laser can't meet the demands at last.
Summary of the invention
The method that the object of the present invention is to provide light source that a kind of WDM-PON system shares and light source to share is to solve the problem that light source is provided for a plurality of WDM-PON system by a common light source.
For achieving the above object, the present invention adopts following technical scheme:
The shared common light source of a kind of Wave division multiplexing passive optical network WDM-PON system, described light source comprises:
Wide spectrum light source outputs to optical branching device after being used for producing wide range light;
Optical branching device is used for the wide range light from described wide spectrum light source is divided into many parts of identical wide range light, for a plurality of WDM-PON system provides wide range light.
Wherein said light source also comprises:
Image intensifer is used for described wide range light is carried out light amplification.
Wherein said light source also comprises:
Optical band pass filter is used for the wide range light that described wide spectrum light source produces is carried out filtering.
Wherein said light source also comprises:
The backup light source when described wide spectrum light source fault, substitutes described wide spectrum light source and produces wide range light.
The present invention also provides the method for the shared common light source of a kind of WDM-PON system, and described method comprises the steps:
A, wide spectrum light source produce wide range light, and described wide range light is outputed to optical branching device;
After b, described optical branching device receive described wide range light, be divided into many parts of identical wide range light, output to a plurality of WDM-PON system;
The described wide range light that c, the utilization of described a plurality of WDM-PON system receive is finished the transmission of data.
Wherein said method also comprises:
Image intensifer carries out luminous power to described wide range light and amplifies.
Wherein step c specifically comprises:
The optical line terminal of described WDM-PON system is composed the described wide range light that receives and is cut apart, obtain different wavelength of laser, and downlink data is modulated to the optical network unit that sends to described WDM-PON system in the described different wavelength of laser, finish the transmission of downlink data;
Perhaps, the optical fiber distributing network of described WDM-PON system is composed the described wide range light that receives and is cut apart, and be transferred to different optical network units cutting apart the different wavelength of laser that obtains, the laser that receives is carried out injection locking with the laser of described optical network unit or back generation laser is amplified in reflection, simultaneously upstream data is modulated in the laser of described injection locking or reflection amplification back generation, and the laser after the modulation sent to the optical line terminal of described WDM-PON system, finish the transmission of upstream data.
Wherein step c also comprises:
After described WDM-PON system receives described wide range light, it is carried out light amplification, carry out described spectrum then and cut apart.
The system that the present invention also provides a kind of WDM-PON system of shared common light source to form, described system comprises:
Up common light source, be used for producing wide range light after optical branching device is divided into many parts of identical wide range light and output to a plurality of WDM-PON system, compose for described a plurality of WDM-PON system and cut apart the required laser of upstream data that the back produces the optical network unit that sends described a plurality of WDM-PON system;
Descending common light source, be used for producing wide range light after optical branching device is divided into many parts of identical wide range light and output to a plurality of WDM-PON system, be used for composing and cut apart the required laser of downlink data that the back produces the optical line terminal that sends described a plurality of WDM-PON system for described a plurality of WDM-PON system.
Wherein, the wide spectrum light source of the wide spectrum light source of described up common light source and described descending common light source satisfies the periodic characteristic of the free spectral range FSR of array waveguide grating AWG.
The present invention overcomes the deficiencies in the prior art, employing is produced behind the wide range light through optical band pass filter filtering by wide spectrum light source, amplify back input splitter through amplifier then, be divided into the technical scheme that outputs to each WDM-PON system behind the many parts of identical wide spectrum light sources by splitter, the low-cost light source solution of a kind of WDM-PON is provided, has reduced the application cost of WDM-PON; In addition, adopt common light source of the present invention the WDM-PON system synchronously and scheduling mechanism simple, help the realization and the application of system.
Description of drawings
Fig. 1 is the PON system construction drawing;
Fig. 2 is the system diagram of the WDM-PON of available technology adopting wide spectrum light source;
Fig. 3 is the system diagram of the WDM-PON of available technology adopting tunable light source;
Fig. 4 is the WDM-PON system diagram of the multiple-wavelength laser that combines with time division multiplexing of available technology adopting wavelength division multiplexing;
Fig. 5 is the system diagram of the described common light source of the embodiment of the invention;
Fig. 6 is the system diagram of the common light source of the described employing two-stage of embodiment of the invention branch;
Fig. 7 is the WDM-PON system diagram of the described employing common light source of the embodiment of the invention.
Embodiment
Basic principle of the present invention is to provide light source for a plurality of WDM-PON system simultaneously by common light source, wide spectrum light source produces behind the wide range light through optical band pass filter filtering, amplify back input splitter through amplifier then, output to each WDM-PON system after being divided into many parts of identical wide spectrum light sources by splitter.
Be elaborated below in conjunction with the drawings and specific embodiments.
The common light source of the embodiment of the invention behind the wide range light process optical band pass filter that wide spectrum light source produces, through the amplification of image intensifer, by splitter, is divided into the identical wide spectrum light source of N part as shown in Figure 5 then, and output is given each WDM-PON and used.In common light source, influence communication in order to prevent the wide spectrum light source fault, also designed a backup light source, when the wide spectrum light source fault, the backup light source is started working, and is coupled to optical band pass filter by coupler, finishes the function of wide spectrum light source.
Certainly the branch of common light source is not limited only to one-level, also can adopt the way of multistage branch further to improve the degree of share of common light source, a kind of common light source that adopts two-stage branch as shown in Figure 6.
Wide spectrum light source can be LED (light emittingdiode), supercool light-emitting diode SLED (super-luminescent LED) or amplify self-excitation emitting laser ASE (amplified spontaneous emission) in above-mentioned common light source.
In above-mentioned common light source, image intensifer can be Erbium-Doped Fiber Amplifier EDFA (erbium-doped fiber amplifier), semiconductor amplifier SOA (semiconductoroptical amplifier) or raman amplifier.
In above-mentioned common light source, the spectrum that is input to the wide spectrum light source among each WDM-PON is cut apart available AWG (array waveguide grating, array waveguide grating) realizes, spectral line through AWG is cut apart, wide spectrum light source will be divided into wavelength and be respectively λ 1, ..., the laser of narrowband of λ n, the wavelength interval is determined by the channel spacing of AWG.
In above-mentioned common light source, after wide spectrum light source after amplifying is divided into the lower-powered wide spectrum light source of N part through splitter, in order to ensure transmission range enough far away and enough big injecting power, enter each WDM-PON system compose cut apart before, can also carry out a light amplification again.
Utilize above-mentioned common light source, can constitute one simply, WDM-PON system cheaply, as shown in Figure 7.In this system, two common light source are arranged.One is descending common light source, be used to the OLT of each WDM-PON system that descending wide spectrum light source is provided, after cutting apart through spectrum, will obtain wavelength is λ 1, λ 2, λ n laser passes through modulator array then, and it is λ 1 that user's data is modulated to wavelength, λ 2, in the laser of λ n and send among each ONU, the descending light that has carried user data is transferred to the receiver of each ONU through ODN, thereby finishes the transmission of downlink data.
Another is up common light source, this light source will provide line light source for the ONU that is positioned at user side in the WDM-PON system, this wide range light is through branch and after amplifying, by coupler and circulator, be transferred to the AWG of far-end node, after the spectral line of process AWG is cut apart, will be provided for sending the laser of upstream data for each ONU.In the structure of Fig. 7, because feeder line optical fiber adopts is to have only an AWG on single fiber and the far-end node, so wide spectrum light source 1 and wide spectrum light source 2 will satisfy the periodic characteristic of the free spectral range FSR (Free Spectrum Range) of AWG.Therefore, after the spectral line of process AWG was cut apart, each ONU was respectively λ 1+FSR with receiving wavelength respectively, ..., the laser of λ n+FSR is after the loopback modulation through ONU, to send back to the up receiver module of OLT by the ODN network, thereby finish up transfer of data.Wherein, the realization of the loopback of ONU modulation adopts injection locking fabry-Perot type laser FP LD laser (injection_locked FP LD) or RSOA as the laser of directly modulating.Detailed operation principle about injection locking FP LD laser please refer to patent of invention US2001/0004290 and US2005/0163503, and the detailed operation principle about RSOA please refer to patent of invention US2005/0025484 and US2006/0093360.
The workflow of the WDM-PON system that is made of common light source of the present invention below is described:
During transmitting downlink data, being input to amplifier after the wide range light process optical band pass filter filtering that wide spectrum light source 2 produces amplifies, wide range light after amplifying is input to splitter, splitter is divided into many parts of identical wide range light with the wide range light of input, each part wide range light is input among the OLT of a WDM-PON, being input to the spectrum dispenser after each OLT amplifies the wide range light that receives composes and cuts apart, it is λ 1 that wide range light is divided into wavelength, λ 2, λ n laser, pass through modulator array then, each user's descending unicast data is modulated to respectively in the laser of narrowband that above-mentioned wavelength is respectively λ 1～λ n, the descending light that has carried user data is transferred to the receiver of each ONU through ODN, as shown in Figure 7, wavelength is that the laser transmission of λ 1 arrives ONU1, wavelength is that the laser transmission of λ 2 is in ONU2, wavelength is that the laser transmission of λ n is in ONUn, reception among each ONU and loopback modulation module are finished opto-electronic conversion and the demodulation function to the light signal of the descending unicast data that has carried this ONU user, recover user's descending unicast data, thereby finish the transmission of downlink data.
During transmit ascending data, being input to amplifier after the wide range light process optical band pass filter filtering that wide spectrum light source 1 produces amplifies, wide range light after amplifying is input to splitter, splitter is divided into many parts of identical wide range light with the wide range light of input, each part wide range light is imported among the OLT of a WDM-PON, each OLT amplifies the wide range light that receives, be transferred to far-end AWG through coupler and circulator then and compose and cut apart, the wavelength that is provided for sending upstream data for each ONU is respectively (λ 1+FSR), (λ 2+FSR), ..., the laser of (λ n+FSR).After user's up unicast data is modulated in the aforesaid laser, at last the up light of the up unicast data that has carried the user is outputed to far-end AWG, AWG is respectively (λ 1+FSR)～(λ n+FSR) light signal from the wavelength that each ONU receives the up unicast data that has carried each user, then wavelength is respectively (λ 1+FSR)～(λ n+FSR) light signal be combined into a up mixed light, and being transferred to the circulator of above-mentioned OLT, the upstream data processing module that is transferred to then among the OLT is carried out follow-up processing.
After the upstream data processing module of OLT receives up mixed light from ODN, through multiplexing demultiplexer AWG, isolate the light signal that wavelength is respectively (λ 1+FSR)～(λ n+FSR), and deliver to different opto-electronic conversion and demodulated equipment respectively, recover each user's upstream data.
Claims (10)
1. the common light source shared of a Wave division multiplexing passive optical network WDM-PON system is characterized in that described light source comprises:
Wide spectrum light source outputs to optical branching device after being used for producing wide range light;
Optical branching device is used for the wide range light from described wide spectrum light source is divided into many parts of identical wide range light, for a plurality of WDM-PON system provides wide range light.
2. light source according to claim 1 is characterized in that, described light source also comprises:
Image intensifer is used for described wide range light is carried out light amplification.
3. light source according to claim 1 is characterized in that, described light source also comprises:
Optical band pass filter is used for the wide range light that described wide spectrum light source produces is carried out filtering.
4. light source according to claim 1 is characterized in that, described light source also comprises:
The backup light source when described wide spectrum light source fault, substitutes described wide spectrum light source and produces wide range light.
5. the method for the shared common light source of WDM-PON system is characterized in that described method comprises the steps:
A, wide spectrum light source produce wide range light, and described wide range light is outputed to optical branching device;
After b, described optical branching device receive described wide range light, be divided into many parts of identical wide range light, output to a plurality of WDM-PON system;
The described wide range light that c, the utilization of described a plurality of WDM-PON system receive is finished the transmission of data.
6. method according to claim 5 is characterized in that, described method also comprises:
Image intensifer carries out luminous power to described wide range light and amplifies.
7. method according to claim 5 is characterized in that, wherein step c specifically comprises:
The optical line terminal of described WDM-PON system is composed the described wide range light that receives and is cut apart, obtain different wavelength of laser, and downlink data is modulated to the optical network unit that sends to described WDM-PON system in the described different wavelength of laser, finish the transmission of downlink data;
Perhaps, the optical fiber distributing network of described WDM-PON system is composed the described wide range light that receives and is cut apart, and be transferred to different optical network units cutting apart the different wavelength of laser that obtains, the laser that receives is carried out injection locking with the laser of described optical network unit or back generation laser is amplified in reflection, simultaneously upstream data is modulated in the laser of described injection locking or reflection amplification back generation, and the laser after the modulation sent to the optical line terminal of described WDM-PON system, finish the transmission of upstream data.
8. method according to claim 7 is characterized in that, wherein step c also comprises:
After described WDM-PON system receives described wide range light, it is carried out light amplification, carry out described spectrum then and cut apart.
9. the system that forms of the WDM-PON system of a shared common light source is characterized in that described system comprises:
Up common light source, be used for producing wide range light after optical branching device is divided into many parts of identical wide range light and output to a plurality of WDM-PON system, compose for described a plurality of WDM-PON system and cut apart the required laser of upstream data that the back produces the optical network unit that sends described a plurality of WDM-PON system;
Descending common light source, be used for producing wide range light after optical branching device is divided into many parts of identical wide range light and output to a plurality of WDM-PON system, be used for composing and cut apart the required laser of downlink data that the back produces the optical line terminal that sends described a plurality of WDM-PON system for described a plurality of WDM-PON system.
10. system according to claim 9 is characterized in that, the wide spectrum light source of described up common light source and the wide spectrum light source of described descending common light source satisfy the periodic characteristic of the free spectral range FSR of array waveguide grating AWG.
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| CNA2006100621252A CN101127571A (en) | 2006-08-15 | 2006-08-15 | A public light source shared by WDM-PON system and method for light source sharing |
| PCT/CN2007/070416 WO2008019612A1 (en) | 2006-08-15 | 2007-08-06 | A common light source, wavelength division multiplexing passive optical network system and method for the system to share the light source |
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| CNA2006100621252A CN101127571A (en) | 2006-08-15 | 2006-08-15 | A public light source shared by WDM-PON system and method for light source sharing |
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