CN102695101B - EPON on a kind of wavelength division multiplexing - Google Patents
EPON on a kind of wavelength division multiplexing Download PDFInfo
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Abstract
The present invention relates to the EPON (PON-Over-WDM network) on a kind of wavelength division multiplexing.This network comprises a WDM coupler, ONU terminal, light circulator, first wave length transducer.Wherein, the burst luminous signal that described ONU terminal sends leads described first wave length transducer by described light circulator, this first wave length transducer is used for carrying out wavelength convert to this light signal, and the light signal after this Wavelength-converting is sent to a described WDM coupler and is coupled, then transmit on simple optical fiber.Cost of the present invention is low, can flexible expansion and access Large Copacity ONU equipment or terminal use, can compatible different equipment supplier and operator, can be applied in optical communication network.
Description
Technical field
The present invention relates to communication technical field, particularly relate to optical communication network.
Background technology
At present along with accelerating the integration of three networks advancing telecommunications network, broadcasting and television network and the Internet, and telecom operators and radio and TV operator actively push forward EPON (PassiveOpticalNetwork, PON) scale is commercial, and broadband network has welcome the upgrading climax of a new round.Why the network bandwidth can constantly raise speed is had benefited from the development of the optical communication technique supporting fiber optic network, and optical communication network have employed the fiber medium of enormous bandwidth resource and excellent transmission performance.
As a kind of more advanced fixed network access way, FTTx (fiber to the home/building/community etc.) technology is the inevitable solution of " light entering and copper back ", the PON Access Network network architecture is settled at one go, FTTx can provide the bandwidth of more than 20MHz, thus achieves a fiber support and comprise the miscellaneous services such as broadband, IPTV, VoIP and video.At present, according to the distance of fiber-to-the-subscriber and the on-position of user port, several service patterns such as FTTB (FiberToTheBuilding), fiber to the home FTTH (FiberToTheHome), FTTC FTTC (FiberToTheCurb) that FTTx can be divided into that Fiber To The Building.
FTTx technology in PON make use of fiber medium to realize, the information such as data communication/voice/video image are from the local side apparatus OLT (OpticalLineTerminal of region telecommunications room, optical line terminal) to the transmission of subscriber terminal equipment ONU (OpticalNetworkUnit, optical network unit).
Fig. 1 is a kind of PON framework schematic diagram of the prior art.In Fig. 1, OLT is the terminal equipment be connected on fiber optic backbone, provides, comprise traditional IP operation and TDM business for the centralized management of network and business.ONU then belongs to the terminal equipment of user of access network side, and it accepts management and the configuration of OLT, and directly provides the various services such as data communication/voice/video image for user as the interface between user and network.Therefore, OLT and ONU is key equipment in PON and cost-determining factor, how to ensure its steady running and be easy to expand to safeguard to be operator in networking and the factor of overriding concern in safeguarding.
Under the background of full-service operation and the integration of three networks, all kinds of video traffic larger to bandwidth consumption, game service and convention business continue to bring out, and the more demands to ONU end mouth quantity, make communication network be faced with larger pressure for upgrading.But based on the solution of current PON, each OLT can only access at most 64 ONU equipment (accessing 128 ONU end mouths at most in theory).Current interim solution is: when building Access Network, adopting the mode of constantly being sunk by OLT, making OLT device more and more close to user terminal.But this kind of mode result in extremely complicated ODN network (optical distribution network).Therefore, the bottleneck that the huge worry of operator and optical access network further develop is become.
Based on this kind of active demand and huge market pressure, 10GPON and WDM-PON starts the development and production plan entering into PON equipment supplier.
10GPON network is by the uplink and downlink bandwidth of intelligent acess network, improve 10 times (bandwidth can reach 10Gbps), and can with the procotol of existing GEPON/GPON scheme and topological structure compatible, therefore for equipment operator, there is great attraction.But it is due to the various Primary Components in 10GPON network, as integrated chip, optical device and optical module etc., also immature technically and on the high side.Therefore, current 10GPON is still difficult to commercially form scale use.
WDM-PON uses different wave length to work simultaneously, and its bandwidth that user can be accessed increases several times and even decades of times, thus meets user to ultimate demand.The most basic scheme of WDM-PON is the light source adopting multiple different wave length in the olt, and each ONU also uses the light source of specific wavelength, in advance to each point-to-point connection configuration wavelength, thus utilizes each wavelength channel to guarantee the bandwidth of each user.
At present, required in WDM-PON system optical module, wideband light source technology and integrated chip are still immature.WDM-PON network requirement adopts OLT or the ONU equipment of special manufacture, requires that each OLT or ONU will have independent one's own wavelength, or the ONU equipment that particular design manufactures, thus result in extremely high networking and maintenance cost.In addition, WDM-PON still lacks international standard, and then hinders the development of WDM-PON technology further.
Chinese invention patent CN101114885A discloses hybrid wavelength-division and time-division multiplexing passive optical network system, terminal and method for transmitting signals.This patent application hereby claims uses an All Optical Wave Converter on each OLT port, and each up wavelength will use the special WDM multiplexer of specific wavelength window, result in the network construction cost of its costliness.Chinese invention patent CN101237293A discloses wavelength-division and time-division multiplexing passive optical network system.This patent application hereby claims adopts the colorless ONU equipment of particular design, and namely have special requirement to ONU equipment, construction cost is also very high.
Summary of the invention
The invention provides the EPON (PON-Over-WDM network) on a kind of wavelength division multiplexing overcome the above problems.
In first aspect, the invention provides the EPON (PON) on a kind of wavelength division multiplexing (WDM), comprise a WDM coupler, ONU terminal, light circulator, first wave length transducer.Wherein, the burst luminous signal guiding first wave length transducer that ONU terminal sends by light circulator, this first wave length transducer is used for carrying out wavelength convert to this light signal, and the light signal after this Wavelength-converting is sent to a WDM coupler and is coupled, and then transmits on simple optical fiber.
The present invention fundamentally solves and breaches the bottleneck of Access Network development, by the advantage in conjunction with PON low cost, easily networking, easy care, and the advantage of WDM network large bandwidth and dynamic-configuration, have employed the PON framework (or being referred to as PON-Over-WDM network) in wavelength-division (WDM), achieve on the basis of guaranteeing each household bandwidth demand, effectively managed a large amount of OLT device flexibly.In addition, a large amount of ONU end mouth of easily extensible of the present invention, and be easy to framework again, really achieve multi-user's Optical Access Network of the large access capacity of low cost construction.
In addition, the present invention can adopt OLT device, ONU equipment, the Passive Optical Components of standard, therefore can compatible different equipment supplier and operator, achieve network truly completely " transparent ", meet the construction demand of unification of three nets and the Internet of Things increased fast.
Accompanying drawing explanation
Below with reference to accompanying drawings specific embodiment of the invention scheme is described in detail, in the accompanying drawings:
Fig. 1 is a kind of PON frame-saw signal of the prior art;
Fig. 2 is the PON schematic diagram on the WDM of one embodiment of the invention;
Fig. 3 is the PON schematic diagram on the WDM of another embodiment of the present invention;
Fig. 4 is the photoelectricity light bi-directional wavelength transducer of one embodiment of the invention;
Fig. 5 is the unidirectional wavelength shifter of photoelectricity light of one embodiment of the invention;
Fig. 6 is the GEPON network diagram on the WDM of one embodiment of the invention.
Embodiment
Fig. 2 is PON (PON-Over-WDM network) schematic diagram on the WDM of one embodiment of the invention, and what this figure illustrated is the WDM-Over-PON network diagram adopting single OLT device.
In Fig. 2, down direction, in central office, the descending transmission wavelength of single OLT is the CW light signal (continuous light signal) of λ D (as 1490nm), and wavelength, after first passive WDM coupler that central office locates, is the light signal guiding multi-wavelength generator of λ D by this CW light signal, then after this multi-wavelength generator, the light signal with multiple different wave length is created, and wavelength is respectively λ D1, λ D2 ..., λ Dn.This multiple wavelength optical signal after the second passive WDM coupler compound at place of central office closes ripple, transmits in single Transmission Fibers again.Wherein, this simple optical fiber length can be greater than 20 kilometers.
Preferably, a long-range smooth relay amplifier is accessed, more ONU terminal equipment can be accessed and can transmit longer distance at above-mentioned second passive WDM coupler place.
Down direction, at user side, this multi-wavelength CW light signal (wavelength is respectively λ D1, λ D2...... λ Dn), when arriving the passive WDM coupler of user side, wavelength is that the CW light signal of λ D1 can be directed to corresponding ONU cohort 1, and is broadcasted by optical splitter; Wavelength is that the CW light signal of λ D2 can be directed to corresponding ONU cohort 2, and is broadcasted by optical splitter; ...; Wavelength is that the light signal of the CW of λ Dn is directed to corresponding ONU cohort n, and is broadcasted by optical splitter.It should be noted that, also can adopt multiple passive WDM coupler at user side, specific implementation participates in Fig. 3 and respective description part thereof.Fig. 3 is for the elaboration done by multiple passive WDM coupler (at user side).
Up direction, at user side, from the uplink optical signal of ONU, such as there is the burst luminous signal of standard 1310nm wavelength, after optical splitter (as PON optical splitter) closes light based on TDM technology, by passive light circulator guiding wavelength shifter, this wavelength shifter converts this burst luminous signal to burst luminous signal that wavelength is λ Ux (x=1,2......n).It should be noted that, this wavelength shifter can be changed a wavelength, also can change to multiple wavelength simultaneously.Particularly, between its corresponding ONU cohort of each passive WDM coupler of user side, a passive light circulator is had.The effect of this passive light circulator is: be that the multiple wavelength optical signal of λ Dx (wherein, x=1,2......n) leads in corresponding ONU cohort by the wavelength of down direction; And by up burst luminous signal, (wavelength is λ U, if wavelength is standard 1310nm wavelength) lead a wavelength shifter, so that this wavelength shifter converts this burst luminous signal to burst luminous signal that wavelength is λ Ux (wherein, x=1,2......n).
Up direction, at user side, this wavelength is that the burst luminous signal of λ Ux continues to go upward to passive WDM coupler, and carries out conjunction light with the burst luminous signal from other ONU cohort, then transmits on simple optical fiber.Wherein, transmission range is greater than 20 kilometers.
Preferably, between this optical splitter and ONU terminal, adopt optical repeater or adopt far-end image intensifer, more ONU terminal can be accessed and can transmit longer distance.
Up direction, in central office, carries out wavelength convert, to convert the light signal of wavelength required for OLT device to, as converted standard wave length 1310nm to by from the burst luminous signal (wavelength is respectively λ U1, λ U2...... λ Un) on simple optical fiber.It should be noted that, if the semiconductor detector in OLT device has wider wavelength window, as wavelength window is greater than 300nm, then do not need this wavelength shifter, but by wavelength selector directly by the burst luminous signal of multi-wavelength guiding OLT device.
Above-mentioned Fig. 2 is set forth for single OLT device, and in fact, OLT device can have multiple.Multiple OLT device is substantially identical with single OLT device principle, participates in Fig. 3.
Fig. 3 is the PON schematic diagram on the WDM of another embodiment of the present invention, and what this figure illustrated is adopt multiple OLT device in central office, adopts the PON based on WDM of multiple passive WDM coupler at user side.
In Fig. 3, down direction, in central office, the CW light signal (wavelength is λ D) that multiple OLT device sends, after wavelength convert, wavelength is respectively λ D1, λ D2...... λ Dn (not illustrating wavelength shifter in Fig. 3), close after ripple through passive WDM coupler again, transmit in single Transmission Fibers.
Down direction, at user side, when multiple wavelength optical signal arrives the passive WDM coupler of user side, first wavelength is that the light signal of λ D1 can be directed to corresponding ONU cohort 1; Remaining wavelength can continue to go downwards to next passive WDM coupler, and wavelength is that the light signal of λ D2 can be directed to corresponding ONU cohort 2; The rest may be inferred, makes the light signal of its commplementary wave length be directed to corresponding ONU cohort.
Up direction, at user side, the burst luminous signal of ONU group sending, if wavelength is the light signal of 1310nm, after optical splitter closes light based on TDM technology, by passive light circulator guiding wavelength shifter (Fig. 3 does not illustrate), after wavelength convert, then close ripple by passive WDM coupler.Then the passive WDM coupler of 1:N multichannel is up to.This multichannel passive WDM coupler is based on different wavelength configuration, and lead the light signal from different ONU cohort corresponding OLT device.And then transmit on simple optical fiber.
Preferably, a 3R wavelength shifter is had at above-mentioned passive WDM coupler place, then burst luminous signal is after going downwards to this passive WDM coupler, photo reversal conversion can be carried out through this 3R wavelength shifter, and by this 3R wavelength shifter, completely the small-signal from ONU terminal equipment can be carried out regenerative amplification, thus can allow to access more ONU terminal equipment.
Up direction, in central office, multiple wavelength optical signal leads corresponding OLT device after passive WDM coupler.
Of the present invention based in the PON of WDM, wavelength shifter includes but are not limited to: photoelectricity light (O-E-O) wavelength shifter, based on the wavelength shifter of injection locking Fabry-Perot laser, based on the wavelength shifter of reflective semiconductor optical amplifier (RSOA), based on the wavelength shifter of Bragg grating laser semiconductor image intensifer, 3R based on non-linear gain modulation (XGM) or phase-modulation (amplifies again, clock recovery, signal restoring) all-optical regeneration wavelength shifter, based on the tunable wavelength transducer of wavelength-tuned laser.
In order to reduce costs further, the invention provides a kind of O-E-O (photoelectricity light) bi-directional wavelength transducer and O-E-O (photoelectricity light) unidirectional wavelength shifter.See Fig. 4, Fig. 5.Fig. 4 is photoelectricity light bi-directional wavelength transducer schematic diagram, and Fig. 5 is the unidirectional wavelength shifter of photoelectricity light.
In Fig. 4, this bi-directional light electric light wavelength shifter adopts two optical modules, and these two optical modules can adopt but be not limited to PON optical module or other the optical module of standard, the optical module etc. of such as SFP optical module, or specific customization.In Fig. 4, wavelength is that the light signal of λ 1 inputs to the first optical module, then carries out electricity from ring or light from ring, then is launched by the second optical module and export, and now wavelength has converted λ 2 to; Wavelength is that the light signal of λ 3 inputs to the second optical module, then carries out electricity from ring or light from ring, then is reflected by the first optical module and export, and now wavelength has converted λ 4 to.
In Fig. 5, this Unidirectional light electric light wavelength shifter adopts an optical module, and this optical module can adopt but be not limited to PON optical module or other the optical module of standard, the such as optical module etc. of SFP optical module or specific customization.In Fig. 5, wavelength is that the light signal of λ 1 inputs to this optical module, then carries out electricity from ring or light from ring, then is launched by this optical module and export, and now wavelength has converted λ 2 to.
It should be noted that, each OLT device of the present invention and each ONU terminal equipment, can adopt the PON technology of standard, namely adopts OLT device and the ONU equipment of standard, as technology such as 10GEPON, 10GxGPON.
The present invention can adopt the ONU equipment of standard, and adopts the TDM technology unified distribution wavelength of low cost, because this scheme is different from the WDM-PON technology being in the development phase at present completely.Existing WDM-PON technical requirement adopts special OLT and ONU equipment, and each ONU needs to distribute wavelength separately, result in extremely high network construction cost, limits WDM-PON application in practice.The present invention then can compatible any operator and compatible any one PON equipment, such as GEPON, GPON, 10GEPON, 10GxGPON etc.Therefore, the present invention is a pure transparent network, and it can guarantee that any operator can both access at any time, and each user can both select the carrier service of needs at any time.
Below for GEPON, more a step sets forth how to realize the PON based on WDM of the present invention.Fig. 6 is the GEPON network diagram on the WDM of one embodiment of the invention.
In Fig. 6, from the light signal with 1490nm wavelength of OLT device after multi-wavelength conversion, export and have the multiple wavelength optical signal of OLT information, its wavelength is respectively λ D1 ..., λ Dn.This multiple wavelength optical signal, after the WDM coupler that central office locates is coupled, transmits in simple optical fiber.This multiple wavelength optical signal arrives the passive AWG of user side when dividing photo coupler, and the light signal of different wave length can be directed to corresponding ONU cohort.
Preferably, in the WDM coupler at place of central office, Raman fiber amplifier is accessed, to guarantee to access more ONU terminal equipment.
A passive light circulator is had between the passive AWG light splitting coupler and ONU cohort of user side, downlink optical signal from AWG light splitting coupler leads corresponding ONU cohort by this passive light circulator, and by the uplink optical signal (wavelength is 1310nm) from ONU cohort, lead this wavelength shifter, (if wavelength is λ Ux after wavelength convert, x=1,2, n), go upward to this AWG again and divide photo coupler, this multiple wavelength optical signal is transferred to central office through simple optical fiber by this AWG light splitting coupler.
In central office, up multiple wavelength optical signal is through SOA (semiconductor optical amplifier), OBPF (narrow band light band pass filter), and being converted to wavelength is 1310nm standard burst luminous signal.In addition, if the receiving end in OLT device have extremely wide wavelength window time, as wavelength window is greater than 300nm, then now can not carry out wavelength convert to up burst luminous signal, can directly be linked in OLT device.
Preferably, utilize WSS (wavelength selector) or ROADM (configurable OADM device) to wavelength intelligent reallocation, arrive the OLT device of specifying.
To sum up, the present invention adopts multi-wavelength converter to single or multiple OLT device dynamic assignment different wave length, to manage different ONU cohorts.Transmit on an optical fiber after closing ripple when realizing descending simultaneously, when arriving user side, adopt passive wavelength-division optical device, such as AWG (array optical waveguide) or ROADM (reconfigurable optical add/drop multiplexer), goes to broadcast same OLT device or leads different OLT information and remove different ONU cohorts.Therefore, the PON based on WDM of the present invention combines the advantage of PON low cost and WDM technology large bandwidth, especially directly can adopt the OLT/ONU equipment of standard, thus really achieves the Large Copacity PON guaranteed more than 20MHz bandwidth.PON based on WDM of the present invention, can the otherness of compatible distinct device supplier and operator, meets the demand of unification of three nets.
In addition, the present invention can make a bearing optical fiber capacity reach the expansion of 32 times even higher, really achieves an optical fiber and can be accessed by thousands of terminal interfaces.For 32 DWDM channels and EPON (mounting 64 ONU), adopt the PON based on wavelength division multiplexing of the present invention, single OLT device can support 32*64=2048 ONU terminal.
It should be noted that, be more than the elaboration carried out for EPON, in fact the invention is not restricted to EPON, also can be active optical network.In addition, the present invention can be the PON based on DWDM (intensive multiplexed optical wave with), also can be the PON of PON based on CWDM (coarse wavelength division multiplexer) and other any WDM forms.That is, the present invention includes but be not limited to, based on the xGPON network of WDM, the PON based on DWDM, based on the xGPON network of DWDM, the PON based on CWDM, the xGPON network based on CWDM etc.
Obviously, under the prerequisite not departing from true spirit of the present invention and scope, the present invention described here can have many changes.Therefore, all changes that it will be apparent to those skilled in the art that, all should be included within scope that these claims contain.The present invention's scope required for protection is only limited by described claims.
Claims (17)
1. the EPON (PON) of a wavelength division multiplexing (WDM), comprises a WDM coupler, ONU terminal; It is characterized in that, this network also comprises light circulator, first wave length transducer;
Wherein, the burst luminous signal that described ONU terminal sends leads described first wave length transducer by described light circulator, this first wave length transducer is used for carrying out wavelength convert to this light signal, and the light signal after this Wavelength-converting is sent to a described WDM coupler and is coupled, then transmit on simple optical fiber
;
described EPON alsocomprise optical splitter, and the light signal that ONU terminal sends is carried out conjunction light based on TDM technology by this optical splitter, more described wavelength shifter that the light signal after this conjunction light is led; Described EPON is based on same bearing optical fiber up-downgoing light signal; For local side apparatus OLT is descending, there is fixed wave length light signal, adopt multi-wavelength broadcasting method; For up, there is fixed wave length light signal, distinctive ONUTDM technology is utilized to close light, and by there is from ONU terminal fixed wave length light signal by conjunction light multiplexing after wavelength shifter on same optical fiber of standard local side OLT, wherein, the burst luminous signal that described ONU terminal sends leads described first wave length transducer by described light circulator, this first wave length transducer is used for carrying out wavelength convert to this light signal, and the light signal after this Wavelength-converting is sent to a described WDM coupler and is coupled, then transmit on simple optical fiber.
2. the EPON of a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, described light circulator is also for the corresponding ONU cohort that led by the light signal from a described WDM coupler.
3. the EPON of a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, a described WDM coupler is passive WDM coupler.
4. the EPON of a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, described light circulator is passive light circulator.
5. the EPON of a kind of wavelength division multiplexing as claimed in claim 1, it is characterized in that, described first wave length transducer be bi-directional light electric light wavelength shifter, Unidirectional light electric light wavelength shifter, the wavelength shifter based on FP laser, the wavelength shifter based on reflective semiconductor optical amplifier, based on the wavelength shifter of Bragg grating laser semiconductor image intensifer, based on non-linear gain modulation or the 3R all-optical regeneration wavelength shifter of phase-modulation, one or more based in the tunable wavelength transducer of wavelength-tuned laser.
6. the EPON of a kind of wavelength division multiplexing as claimed in claim 5, is characterized in that, described bi-directional light electric light wavelength shifter comprises two optical modules; Wherein, the light signal of input carries out electricity from ring or light from ring after the first optical module, and carries out transmitting by the second optical module and export, to realize the conversion of wavelength.
7. the EPON of a kind of wavelength division multiplexing as claimed in claim 5, is characterized in that, described Unidirectional light electric light wavelength shifter comprises an optical module; Wherein, the light signal of input carries out electricity and launches output from ring or light again from ring, to realize the conversion of wavelength after this optical module.
8. as claim
7the EPON of described a kind of wavelength division multiplexing, is characterized in that, adopts optical repeater or far-end image intensifer between described optical splitter and described ONU terminal, can access more ONU terminal and to transmit longer distance.
9. the EPON of a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, comprise central office, and this central office comprises OLT device, multi-wavelength generator, the 2nd WDM coupler;
Wherein, described OLT device is sent to described multi-wavelength generator by descending for light signal; This multi-wavelength generator produces the light signal of multi-wavelength based on this light signal; This multiple wavelength optical signal carries out transmitting on optical fiber after compound closes ripple by described 2nd WDM coupler.
10. as claim
9the EPON of described a kind of wavelength division multiplexing, is characterized in that, also comprises second wave length transducer; This second wave length transducer is used for the up multiple wavelength optical signal from described 2nd WDM coupler to carry out wavelength convert, then the light signal after Wavelength-converting is sent to described OLT device.
11. as claim
9the EPON of described a kind of wavelength division multiplexing, is characterized in that, also comprise wavelength selector; This wavelength selector is used for the up multiple wavelength optical signal from described 2nd WDM coupler to be sent to described OLT device.
The EPON of 12. a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, comprise central office, and this central office comprises multiple OLT device, three-wavelength transducer, the 3rd WDM coupler;
Wherein, light signal is sent to described three-wavelength transducer by each OLT device, after wavelength convert, is coupled, then transmits to simple optical fiber via the 3rd WDM coupler.
13. as claim
9the EPON of described a kind of wavelength division multiplexing, is characterized in that, at described 2nd WDM coupler place incoming fiber optic amplifier, can access more ONU terminal equipment.
14. as claim
9the EPON of described a kind of wavelength division multiplexing, is characterized in that, comprises the 4th WDM coupler, and the 4th WDM coupler is used for the downlink optical signal from described OLT device to send, and uplink optical signal is sent to this OLT device.
The EPON of 15. a kind of wavelength division multiplexing as claimed in claim 1, is characterized in that, a described WDM coupler is array optical waveguide (AWG).
16. as claim
9the EPON of described a kind of wavelength division multiplexing, is characterized in that, described OLT device is standard OLT device.
The EPON of 17. a kind of wavelength division multiplexing as claimed in claim 9, is characterized in that, the ONU equipment in described ONU cohort is standard ONU equipment.
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| EP3425434A4 (en) * | 2016-02-29 | 2019-10-30 | Nec Corporation | Optical device |
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| CN101087174A (en) * | 2006-06-08 | 2007-12-12 | 华为技术有限公司 | Passive optical network system and method of optical routing device and application optical routing device |
| CN101202603A (en) * | 2006-12-13 | 2008-06-18 | 上海未来宽带技术及应用工程研究中心有限公司 | Passive optical network system based on wavelength-division multiplex technique |
| CN101188470A (en) * | 2007-12-21 | 2008-05-28 | 卢洪斌 | Uplink and downlink wavelength distribution and management method based on rough wave division multiple address FTTH technology |
| WO2009123571A1 (en) * | 2008-03-31 | 2009-10-08 | Agency For Science, Technology And Research | A wdm-pon architecture based on externally seeded optical source |
| CN101959086A (en) * | 2009-07-15 | 2011-01-26 | 中兴通讯股份有限公司 | Time division multiplex and wavelength division multiplex coexisting passive optical network system and transmission method |
| CN202004922U (en) * | 2011-03-21 | 2011-10-05 | 胡朝昱 | Passive optical network system on wavelength division multiplexing |
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