CN102695101A - Passive optical network over wavelength division multiplexing - Google Patents
Passive optical network over wavelength division multiplexing Download PDFInfo
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Abstract
The invention relates to a passive optical network over wavelength division multiplexing (PON-Over-WDM). The network includes a first WDM coupler, an ONU terminal, a light circulator and a first wavelength converter, wherein the light circulator directs a burst optical signal transmitted by the ONU terminal to the first wavelength converter, and the first wavelength converter is used for performing wavelength conversion of the optical signal and transmitting the wavelength-converted optical signal to the first WDM coupler for coupling after which the optical signal is transmitted through a single optical fiber. The network of the invention is low in cost and flexible in expansion. The network can be accessed by high-capacity ONU equipments or terminal users and is compatible for different equipment suppliers and service providers. The network can be applied to optical communication networks.
Description
Technical field
The present invention relates to communication technical field, relate in particular to optical communication network.
Background technology
At present along with the integration of three networks of accelerating to advance telecommunications network, broadcasting and television network and the Internet; And telecom operators and radio and TV operator actively push forward EPON (Passive Optical Network; PON) scale is commercial, and broadband network has welcome the upgrading climax of a new round.Why can constantly the raise speed development of the optical communication technique that has benefited from supporting fiber optic network of the network bandwidth, optical communication network has adopted the fiber medium that enormous bandwidth resource and excellent transmission performance are arranged.
As a kind of more advanced fixed network access way; FTTx (Fiber to the home/building/sub-district etc.) technology is the inevitable solution of " light advances copper and moves back "; Make the PON Access Network network architecture settle at one go; FTTx can provide 20MHz above bandwidth, thereby has realized that a fiber support comprises 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, can be with the FTTx FTTB (Fiber To The Building) that is divided into that Fiber To The Building, Fiber to the home FTTH (Fiber To The Home), FTTC FTTC several kinds of service patterns such as (Fiber To The Curb).
FTTx techniques make use in the PON network fiber medium realize; Data communication/information such as voice/video image are from local side apparatus OLT (the Optical Line Terminal of regional telecommunications room; Optical line terminal) to the transmission of subscriber terminal equipment ONU (Optical Network Unit, optical network unit).
Fig. 1 is a kind of PON network architecture sketch map of the prior art.Among Fig. 1, OLT is the terminal equipment that is connected on the fiber optic backbone, and the centralized management and the business that are used for network provide, and comprises that traditional I P is professional and TDM is professional.ONU then belongs to the terminal equipment of user of access network side, and it accepts management and the configuration of OLT, and directly for the user data communication/various services such as voice/video image is provided as the interface between user and the network.Therefore, OLT and ONU are key equipment and the cost determination factors in the PON network, how to guarantee its steady running and be easy to expand to safeguard it is the factor of operator's overriding concern in networking and maintenance.
Under the background of the full-service operation and the integration of three networks, all kinds of the bigger video traffic of bandwidth consumption, game service and convention business are continued to bring out, and, make communication network be faced with bigger pressure for upgrading more demands of ONU port number.Yet based on the solution of present PON network, each OLT can only insert 64 ONU equipment (inserting 128 ONU ports in theory at most) at most.Interim solution is at present: when building Access Network, adopt the mode that OLT is constantly sunk, make OLT equipment more and more approach user terminal.Yet this kind mode has caused extremely complicated ODN network (optical distribution network).Therefore, become the huge worry of operator and the bottleneck that optical access network further develops.
Based on this kind active demand and huge market pressure, 10GPON and WDM-PON begin to enter into PON equipment supplier's the exploitation and the production schedule.
The 10GPON network has improved 10 times (bandwidth can reach 10Gbps) with the uplink and downlink bandwidth of Optical Access Network network, and can be compatible with the procotol and the topological structure of existing GEPON/GPON scheme, therefore has great attraction for equipment operator.But because the various Primary Components in the 10GPON network, like integrated chip, optical device and optical module etc., it is ripe and on the high side that is that all right technically.Therefore, 10GPON still is difficult to use in commercial formation scale at present.
WDM-PON uses different wave length to work simultaneously, and it can increase the bandwidth that the user inserts several times and even tens of times, thereby satisfies the user to ultimate demand.The most basic scheme of WDM-PON is in OLT, to adopt the light source of a plurality of different wave lengths, and each ONU also uses the light source of specific wavelength, in advance to each point-to-point connection configuration wavelength, thereby utilizes each wavelength channel to guarantee each user's bandwidth.
At present, desired optical module, wideband light source technology and integrated chip are still immature in the WDM-PON system.The OLT or the ONU equipment of special manufacturing is adopted in the WDM-PON network requirement, requires each OLT or ONU that independent one's own wavelength will be arranged, or the ONU equipment of particular design manufacturing, thereby has caused extremely high networking and maintenance cost.In addition, WDM-PON still lacks international standard, and then has further hindered the development of WDM-PON technology.
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 requires on each OLT port, to use an AOWC, and each up wavelength all will use the special WDM multiplexer of specific wavelength window, has caused its expensive network construction cost.Chinese invention patent CN101237293A discloses the wavelength-division and time-division multiplexing passive optical network system.This patent application requires to adopt the colorless ONU equipment of particular design, promptly ONU equipment is had special requirement, and 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 that overcomes 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 wavelength shifter.Wherein, The burst luminous signal that light circulator sends the ONU terminal first wavelength shifter that leads; This first wavelength shifter is used for this light signal is carried out wavelength Conversion, and the light signal behind this Wavelength-converting is sent to a WDM coupler is coupled, and then on simple optical fiber, transmits.
The present invention fundamentally solves and has broken through the bottleneck of Access Network development; Through combining the advantage that the PON network is low-cost, be prone to networking, easy care; And the advantage of big bandwidth of WDM network and dynamic-configuration; Adopt the PON network architecture (or being referred to as the PON-Over-WDM network) in the wavelength-division (WDM), realized on the basis of guaranteeing the each household bandwidth demand, managed a large amount of OLT equipment flexibly effectively.In addition, the present invention can expand a large amount of ONU ports, and is easy to framework again, has really realized multi-user's Optical Access Network of the big access capacity of low cost construction.
In addition; The present invention can adopt OLT equipment, ONU equipment, the Passive Optical Components of standard; Therefore can compatible different equipment supplier and operators, realized complete network truly " transparent ", satisfied the unification of three nets of quick growth and the construction demand of Internet of Things.
Description of drawings
Below with reference to accompanying drawings specific embodiments of the present invention is explained in more detail, in the accompanying drawings:
Fig. 1 is a kind of PON network frame-saw signal of the prior art;
Fig. 2 is the PON network diagram on the WDM of one embodiment of the invention;
Fig. 3 is the PON network 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 network (PON-Over-WDM network) sketch map on the WDM of one embodiment of the invention, this illustrated be the WDM-Over-PON network diagram that adopts single OLT equipment.
Among Fig. 2, down direction is in the central office; The descending transmission wavelength of single OLT is the CW light signal (continuous light signal) of λ D (like 1490nm), behind this CW light signal first passive WDM coupler through the place, central office, is the light signal guiding multi-wavelength generator of λ D with wavelength; Behind this multi-wavelength generator, produced then and had a plurality of wavelength optical signals; And wavelength is respectively λ D1, λ D2 ..., λ Dn.This multiple wavelength optical signal again through central office place second passive WDM coupler is compound close ripple after, in single Transmission Fibers, transmit.Wherein, this simple optical fiber length can be greater than 20 kilometers.
Preferably, insert a long-range optical relay amplifier at above-mentioned second passive WDM coupler place, so that can insert more ONU terminal equipment and can transmit longer distance.
Down direction; At user side, this multi-wavelength CW light signal (wavelength is respectively λ D1, λ D2...... λ Dn) is 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 broadcasts through optical splitter; Wavelength is that the CW light signal of λ D2 can be directed to corresponding ONU cohort 2, and broadcasts through optical splitter; ...; Wavelength is that the light signal of the CW of λ Dn is directed to corresponding ONU cohort n, and broadcasts through optical splitter.Need to prove, also can adopt a plurality of passive WDM couplers at user side, concrete implementation is participated in Fig. 3 and respective description part thereof.Fig. 3 is to be the elaboration that example has been done with a plurality of passive WDM couplers (at user side).
Up direction; At user side,, for example has the burst luminous signal of standard 1310nm wavelength from the uplink optical signal of ONU; After process optical splitter (like the PON optical splitter) closes light based on the TDM technology; By passive light circulator guiding wavelength shifter, it is λ Ux (x=1, burst luminous signal 2......n) that this wavelength shifter converts this burst luminous signal to wavelength.Need to prove that this wavelength shifter can be changed a wavelength, also can be to a plurality of wavelength are changed simultaneously.Particularly, between its corresponding ONU cohort of each passive WDM coupler of user side, a passive light circulator is arranged.The effect of this passive light circulator is: with the wavelength of down direction is that the multiple wavelength optical signal of λ Dx (wherein, x=1,2......n) leads in the corresponding ONU cohort; And with up burst luminous signal (wavelength is λ U, is standard 1310nm wavelength like wavelength) guiding one 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 closes light with burst luminous signal from other ONU cohort, on simple optical fiber, transmits then.Wherein, transmission range is greater than 20 kilometers.
Preferably, between this optical splitter and ONU terminal, adopt optical repeater or adopt the far-end image intensifer, so that can insert more ONU terminal and can transmit longer distance.
Up direction in the central office, will carry out wavelength Conversion from the burst luminous signal on the simple optical fiber (wavelength is respectively λ U1, λ U2...... λ Un), converting the light signal of the required wavelength of OLT equipment to, as convert standard wave length 1310nm to.Need to prove,, greater than 300nm, then not need this wavelength shifter like wavelength window if the semiconductor detector in the OLT equipment has the broad wavelength window, but through wavelength selector directly with the burst luminous signal of multi-wavelength guiding OLT equipment.
Above-mentioned Fig. 2 only is to be that example is set forth with single OLT equipment, and in fact, OLT equipment can have a plurality of.A plurality of OLT equipment and single OLT equipment principle are basic identical, participate in Fig. 3.
Fig. 3 is the PON network diagram on the WDM of another embodiment of the present invention, this illustrated be to adopt a plurality of OLT equipment in the central office, adopt the PON network based on WDM of a plurality of passive WDM couplers at user side.
Among Fig. 3, down direction is in the central office; The CW light signal that a plurality of OLT equipment send (wavelength is λ D); Wavelength is respectively λ D1, λ D2...... λ Dn (not illustrating wavelength shifter among Fig. 3) after wavelength Conversion, after passive WDM coupler closes ripple, in single Transmission Fibers, transmits again.
Down direction, at user side, when multiple wavelength optical signal arrived the passive WDM coupler of user side, at first wavelength was 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; Like wavelength is the light signal of 1310nm, after optical splitter closes light based on the TDM technology, by passive light circulator guiding wavelength shifter (Fig. 3 does not illustrate); After wavelength Conversion, close ripple by passive WDM coupler again.Be up to the passive WDM coupler of 1:N multichannel then.The passive WDM coupler of this multichannel disposes based on different wavelengths, and corresponding OLT equipment will lead from the light signal of different ONU cohorts.And then on simple optical fiber, transmit.
Preferably; There is a 3R wavelength shifter at the place at above-mentioned passive WDM coupler; Then burst luminous signal can carry out the photo reversal conversion through this 3R wavelength shifter after going downwards to this passive WDM coupler, and through this 3R wavelength shifter; Can fully the small-signal from the ONU terminal equipment be carried out regenerative amplification, thereby can allow to insert more ONU terminal equipment.
Up direction, in the central office, the multiple wavelength optical signal corresponding OLT equipment that behind passive WDM coupler, leads.
In the PON network based on WDM of the present invention; Wavelength shifter includes but are not limited to: photoelectricity light (O-E-O) wavelength shifter, modulates the 3R (amplification again of (XGM) or phase modulated 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, based on non-linear gain; Clock restores, signal restoring) full photo reversal wavelength shifter, based on the tunable wavelength transducer of wavelength tuning laser.
In order further to reduce cost, the invention provides a kind of O-E-O (photoelectricity light) bi-directional wavelength transducer and the unidirectional wavelength shifter of O-E-O (photoelectricity light).Referring to Fig. 4, Fig. 5.Fig. 4 is a photoelectricity light bi-directional wavelength transducer sketch map, and Fig. 5 is the unidirectional wavelength shifter of photoelectricity light.
Among 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 the PON optical module of standard or other optical module, SFP optical module for example, the perhaps optical module of specific customization etc.Among Fig. 4, wavelength is that the light signal of λ 1 inputs to first optical module, then carries out electricity and encircles certainly from ring or light, and by second optical module emission output, this moment, wavelength converted λ 2 to again; Wavelength is that the light signal of λ 3 inputs to second optical module, then carries out electricity and encircles certainly from ring or light, and by first optical module reflection output, this moment, wavelength converted λ 4 to again.
Among Fig. 5, this unidirectional photoelectricity optical transponder unit adopts an optical module, and this optical module can adopt but be not limited to the PON optical module of standard or other optical module, for example the optical module of SFP optical module or specific customization etc.Among Fig. 5, wavelength is that the light signal of λ 1 inputs to this optical module, then carries out electricity and encircles certainly from ring or light, and by this optical module emission output, this moment, wavelength converted λ 2 to again.
What need special instruction is that each OLT equipment of the present invention and each ONU terminal equipment can adopt the PON of standard technological, promptly adopt the OLT equipment and the ONU equipment of standard, like technology such as 10GEPON, 10GxGPON.
The present invention can adopt the ONU equipment of standard, and adopts TDM technology unified distribution wavelength cheaply, because this scheme is different from the WDM-PON technology that is in the development phase at present fully.Special OLT and ONU equipment are adopted in existing WDM-PON specification requirement, and each ONU needs to distribute wavelength separately, have caused extremely high network construction cost, have limited the application of WDM-PON in reality.The present invention then can compatible any one tame operator and compatible any one PON equipment, for example GEPON, GPON, 10G EPON, 10G xGPON etc.Therefore, the present invention is a pure transparent network, and it can guarantee that any one tame operator can both insert at any time, and the operator that each user need can both select at any time serves.
Be example below with GEPON, more a step sets forth and how to realize the PON network based on WDM of the present invention.Fig. 6 is the GEPON network diagram on the WDM of one embodiment of the invention.
Among Fig. 6, after the light signal process multi-wavelength conversion from OLT equipment with 1490nm wavelength, the multiple wavelength optical signal that output has OLT information, its wavelength is respectively λ D1 ..., λ Dn.This multiple wavelength optical signal transmits in simple optical fiber after the WDM coupler at place, central office is coupled.When the passive AWG of this multiple wavelength optical signal arrival user side divided photo coupler, wavelength optical signals can be directed to corresponding ONU cohort.
Preferably, in the WDM coupler at place, central office, insert the Raman fiber amplifier, to guarantee to insert more ONU terminal equipment.
Between the passive AWG light splitting coupler of user side and ONU cohort, a passive light circulator is arranged, this passive light circulator corresponding ONU cohort that will lead from the downlink optical signal of AWG light splitting coupler, and will this wavelength shifter lead from the uplink optical signal (wavelength is 1310nm) of ONU cohort; (like wavelength is λ Ux, x=1,2 after wavelength Conversion; N), go upward to this AWG again and divide photo coupler, this AWG light splitting coupler transfers to the central office with this multiple wavelength optical signal through simple optical fiber.
In the central office, up multiple wavelength optical signal is through SOA (semiconductor optical amplifier), OBPF (narrow band light band pass filter), and having converted wavelength to is 1310nm standard burst luminous signal.In addition,, greater than 300nm, then can up burst luminous signal not carried out wavelength Conversion this moment, can directly be linked in the OLT equipment like wavelength window if when the receipts end in the OLT equipment has extremely wide wavelength window.
Preferably, utilize WSS (wavelength selector) or ROADM (configurable OADM device), arrive the OLT equipment of appointment the wavelength intelligent reallocation.
To sum up, the present invention adopts the multi-wavelength transducer to single or a plurality of OLT equipment dynamic assignment different wave lengths, to manage different ONU cohorts.On an optical fiber, transmit simultaneously after realizing closing when descending ripple; When arriving user side; Adopt passive wavelength-division optical device, for example AWG (array fiber waveguide) or ROADM (reconfigurable optical add/drop multiplexer), the OLT information of going to broadcast same OLT equipment or leading different is removed different ONU cohorts.Therefore, the PON network based on WDM of the present invention has combined the advantage of PON low cost and the big bandwidth of WDM technology, especially can directly adopt the OLT/ONU equipment of standard, thereby has really realized guaranteeing to surpass the big capacity PON network of 20MHz bandwidth.PON network based on WDM of the present invention can compatible distinct device supplier and the otherness of operator, has satisfied the demand of unification of three nets.
In addition, the present invention can make a bearing optical fiber capacity reach 32 times even higher expansion, has realized that really an optical fiber can insert thousands of terminal interface.With 32 DWDM channels and EPON (articulating 64 ONU) is example, adopts the PON network based on wavelength division multiplexing of the present invention, and single OLT equipment can be supported 32*64=2048 ONU terminal.
Need to prove, more than be to be the elaboration that example is carried out with the EPON, in fact the invention is not restricted to EPON, also can be active optical network.In addition, the present invention can be based on the PON network of DWDM (intensive multiplexed optical wave is used), also can be based on the PON network of CWDM (coarse wavelength division multiplexer) and the PON network of other any WDM forms.That is to say, the present invention includes but be not limited to, based on the xGPON network of WDM, based on the PON network of DWDM, based on the xGPON network of DWDM, based on the PON network of CWDM, based on xGPON network of CWDM or the like.
Obviously, under the prerequisite that does not depart from true spirit of the present invention and scope, the present invention described here can have many variations.Therefore, the change that all it will be apparent to those skilled in the art that all should be included within the scope that these claims contain.The present invention's scope required for protection is only limited described claims.
Claims (18)
1. the EPON (PON) on the wavelength division multiplexing (WDM) comprises a WDM coupler, ONU terminal; It is characterized in that this network also comprises light circulator, first wavelength shifter;
Wherein, The burst luminous signal that said light circulator sends said ONU terminal said first wavelength shifter that leads; This first wavelength shifter is used for this light signal is carried out wavelength Conversion; And the light signal behind this Wavelength-converting is sent to a said WDM coupler is coupled, then on simple optical fiber, transmit.
2. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, said light circulator also is used for the corresponding ONU cohort that leads of the light signal from a said WDM coupler.
3. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, a said WDM coupler is passive WDM coupler.
4. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, said light circulator is the passive light circulator.
5. the EPON on a kind of wavelength division multiplexing as claimed in claim 1; It is characterized in that said first wavelength shifter is bi-directional light electric light wavelength shifter, unidirectional photoelectricity optical transponder unit, based on the wavelength shifter of FP laser, based on the wavelength shifter of reflective semiconductor optical amplifier, based on the wavelength shifter of Bragg grating laser semiconductor image intensifer, based on the full photo reversal wavelength shifter of 3R of non-linear gain modulation or phase modulated, one or more based in the tunable wavelength transducer of wavelength tuning laser.
6. the EPON on a kind of wavelength division multiplexing as claimed in claim 5 is characterized in that, said bi-directional light electric light wavelength shifter comprises two optical modules; Wherein, the light signal of input carry out after through first optical module electricity from ring or light from ring, and launch output, to realize the conversion of wavelength by second optical module.
7. the EPON on a kind of wavelength division multiplexing as claimed in claim 5 is characterized in that, said unidirectional photoelectricity optical transponder unit comprises an optical module; Wherein, the light signal of input is through carrying out electricity from ring or light ring emission output more certainly, to realize the conversion of wavelength behind this optical module.
8. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, comprises optical splitter, and the light signal that this optical splitter sends the ONU terminal based on the TDM technology closes light, again this is closed light signal behind the light said wavelength shifter that leads.
9. the EPON on a kind of wavelength division multiplexing as claimed in claim 8 is characterized in that, between said optical splitter and said ONU terminal, adopts optical repeater or far-end image intensifer, so that can insert the more ONU terminal distance longer with transmission.
10. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, comprises the central office, and this central office comprises OLT equipment, multi-wavelength generator, the 2nd WDM coupler;
Wherein, said OLT equipment is sent to said multi-wavelength generator with light signal is descending; This multi-wavelength generator is based on the light signal of this light signal generating multi-wavelength; Said the 2nd WDM coupler carries out this multiple wavelength optical signal compoundly on optical fiber, to transmit after closing ripple.
11. the EPON on a kind of wavelength division multiplexing as claimed in claim 10 is characterized in that, also comprises second wavelength shifter; This second wavelength shifter is used for the up multiple wavelength optical signal from said the 2nd WDM coupler is carried out wavelength Conversion, again the light signal behind the Wavelength-converting is sent to said OLT equipment.
12. the EPON on a kind of wavelength division multiplexing as claimed in claim 10 is characterized in that, also comprises wavelength selector; This wavelength selector is used for the up multiple wavelength optical signal from said the 2nd WDM coupler is sent to said OLT equipment.
13. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, comprises the central office, and this central office comprises a plurality of OLT equipment, three-wavelength transducer, the 3rd WDM coupler;
Wherein, each OLT equipment is sent to said three-wavelength transducer with light signal, through after the wavelength Conversion, is coupled via the 3rd WDM coupler, to simple optical fiber, transmits again.
14. the EPON on a kind of wavelength division multiplexing as claimed in claim 10 is characterized in that, at said the 2nd WDM coupler place incoming fiber optic amplifier, so that can insert more ONU terminal equipment.
15. the EPON on a kind of wavelength division multiplexing as claimed in claim 10; It is characterized in that; Comprise the 4th WDM coupler, the 4th WDM coupler is used for the downlink optical signal from said OLT equipment is sent, and uplink optical signal is sent to this OLT equipment.
16. the EPON on a kind of wavelength division multiplexing as claimed in claim 1 is characterized in that, a said WDM coupler is array fiber waveguide (AWG).
17. the EPON on a kind of wavelength division multiplexing as claimed in claim 10 is characterized in that, said OLT equipment is standard OLT equipment.
18. the EPON on a kind of wavelength division multiplexing as claimed in claim 10 is characterized in that, the ONU equipment in the said ONU cohort is standard ONU equipment.
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| CN103595496A (en) * | 2013-11-08 | 2014-02-19 | 上海大学 | System and method for achieving online upgrading of single-star multi-ring wavelength division multiplexing passive optical network and achieving protection function |
| CN104243082A (en) * | 2014-03-06 | 2014-12-24 | 上海大学 | Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services in wavelength division multiplexing optical access network |
| CN104363070A (en) * | 2014-11-14 | 2015-02-18 | 上海欣诺通信技术有限公司 | Multichannel optical network transmission device and method |
| CN104618302A (en) * | 2014-12-26 | 2015-05-13 | 北京邮电大学 | Single side band modulation technique based on bidirectional phase modulator in 4G radio frequency remote system |
| CN104836618A (en) * | 2014-02-11 | 2015-08-12 | 谭昌文 | Bidirectional five-signal coupling transceiving system and method thereof |
| CN104902353A (en) * | 2015-06-17 | 2015-09-09 | 武汉长光科技有限公司 | Ultra dense wavelength division access method and system based on all-optical wavelength conversion |
| CN105262543A (en) * | 2015-11-24 | 2016-01-20 | 上海欣诺通信技术有限公司 | Gigabit-capable passive optical network (GPON) transmission system and method based on wavelength division multiplexing (WDM) |
| TWI629876B (en) * | 2016-11-30 | 2018-07-11 | 中華電信股份有限公司 | An elastic physical layer grid optical network interactive operation transmission device for switching and converting an upstream optical wavelength of a plurality of optical network units into a specified optical wavelength of NG-PON2 |
| CN109313309A (en) * | 2016-02-29 | 2019-02-05 | 日本电气株式会社 | Optical devices |
| CN116887084A (en) * | 2023-09-08 | 2023-10-13 | 武汉长光科技有限公司 | OLT equipment and WDM-PON system |
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