CN101895795B - Optical network unit device for mutual-excitation multi-wavelength dynamic scheduling in passive optical network (PON) - Google Patents
Optical network unit device for mutual-excitation multi-wavelength dynamic scheduling in passive optical network (PON) Download PDFInfo
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- CN101895795B CN101895795B CN2010101659431A CN201010165943A CN101895795B CN 101895795 B CN101895795 B CN 101895795B CN 2010101659431 A CN2010101659431 A CN 2010101659431A CN 201010165943 A CN201010165943 A CN 201010165943A CN 101895795 B CN101895795 B CN 101895795B
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Abstract
The invention discloses an optical network unit device for mutual-excitation multi-wavelength dynamic scheduling in a passive optical network (PON), belonging to the technical field of optical communication. The optical network unit device comprises an uplink data transmitter, a downlink data receiver and an optical circulator, wherein the output end of the optical circulator is connected with the uplink data transmitter so as to transmit downlink data optical signals, and the input end of the optical circulator is connected with the uplink data transmitter so as to transmit uplink data optical signals; and the uplink data transmitter comprises two FP multi-longitudinal model lasers with the same model intervals, an adjustable band-pass filter, two optical circulator, an optical splitting and coupling device and a control module. Based on the mutual-excitation working mode of two FP multi-longitudinal model lasers, the invention can dynamically generate uplink optical carrier with adjustable multi-wavelength, flexibly and effectively share all uplink wavelength resources, improve the utilization rate of the uplink wavelength resources, has simple structure and low cost, and meet the development requirement on rapid increase of user uplink access capability.
Description
Technical field
What the present invention relates to is the device in a kind of optical communication technique field, specifically is the optical network unit apparatus of mutual excitation multi-wavelength dynamic scheduling in a kind of EPON.
Background technology
In recent years; EPON (passive optical network; PON) technical development is ripe gradually; Extensively lay in states such as the U.S., Korea S, Japan, be acknowledged as the best broadband access scheme of FTTH (the Fiber To The Home) network architecture that solves that Fiber to the home, lot of domestic and foreign research institution and communication enterprise have all dropped into strength and have researched and developed.Along with bandwidth intensive is professional; Like video conference (videoconference), HDTV (HDTV), video request program (VoD) etc.; Or Distributed Calculation is applied in the extensive use in the optical access network, and (Optical Network Unit ONU) requires up average access bandwidth to reach Gigabits per second at least to the user side optical network unit apparatus; And the common obtainable average upstream bandwidth of ONU user has only tens per seconds (EPON:60Mbps at present; BPON:20Mbps GPON:40Mbps), can't satisfy the requirement of those novel business.Therefore, a kind of novel low cost, high bandwidth, colourless ONU structure being provided, is the necessary condition that in optical access network, realizes bandwidth intensive service application of future generation.
Through existing literature search is found; People such as C.H.Yeh and C.W.Chow has delivered the article that is entitled as " Using four wavelength-multiplexed self-seeding Fabry-Perot lasers for 10Gbpsupstream traffic in TDM-PON (realizing the uplink service of 10Gps in the time division multiplexing EPON based on the autoexcitation FP-LD laser of four wavelength multiplexings) " on Optics Express 2008, propose a kind of simple 10Gpbs TDM-PON architecture.Use four identical lasers of Fabry-Perot cheaply (FP-LD) at the ONU place; Adopt the autoexcitation mode to produce four kinds of different up wavelength (λ 1～λ 4) simultaneously; On each autoexcitation carrier wave, carry the upstream data of 2.5Gbps, behind wavelength division multiplexing, produce the 10Gpbs upstream and send to optical line terminal OLT (Optical Line Terminal).In confirmatory experiment, the transmitter module that ONU holds single wavelength channel by a fiber reflector (fiber reflected mirror, FRM); One 1 * 2 optical coupler (coupler; CP), and Polarization Controller (polarization controller, PC); (wavelength demux/mux WDM) forms with a Fabry-Perot laser (FP-LD) wavelength division multiplexer.The output of FP laser links to each other with the end of Polarization Controller PC; The other end of Polarization Controller PC links to each other with the end of wavelength division multiplexer WDM; The other end of wavelength division multiplexer WDM links to each other with the road port that closes of 1 * 2 optical coupler CP; 1 * 2 optical coupler CP one of them divide road port to link to each other with fiber reflector FRM, 1 * 2 optical coupler CP another minute road port as the output port of this transmitter module and optical circulator (optical circulator, OC) continuous; 2.5Gbps upstream data directly be modulated on the FP laser through biasing circuit, another port of optical circulator OC links to each other with the descending receiver module Rx of ONU.But; Still send the multicarrier upstream data simultaneously owing to ONU in this technology according to time division multiplexing mode; No matter the uplink service load is big or small, ONU monopolizes all wavelength resources at a certain time slot, and this mechanism is not taken the actual ascending load of each ONU into consideration; Do not distribute two kinds of resources of time and wavelength flexibly effectively, thereby cause burst mode transceiver utilance not high.
Find again that through retrieval people such as M.Attyballe and Y.J.Wen deliver " Increasingupstream capacity in TDM-PON with multiple-wavelength transmission using Fabry-Perotlaser diodes (increasing the up-link capacity of time division multiplexing EPON based on the multi-wavelength transmission mechanism of FP-LD laser) " on Optics Express 2007.In this technology: optical line terminal OLT transmitting downstream data wavelength and a plurality of unmodulated seed wavelength are to ONU; In ONU, use selector and the burst mode modulator of single Fabry-Perot laser as the upgoing wave long-channel; Pass through adjustment; Let the FP-LD zlasing mode be locked on some seed excitation wavelengths, the upstream of 2.5Gbps is sent in modulation, thereby realizes the dynamic access mechanism of ONU multi-wavelength.The transmitter module of ONU end only is made up of the FP-LD laser that receives adjustment control, and upstream data directly is modulated on the FP laser.But this Technology Need sends the seed excitation wavelength from local side OLT, and the power of locating through distant-end node RN (Remote Node) is cut apart and is sent to each ONU, and the power budget of seed exciting light source is comparatively nervous; And in order to realize the dynamic locked mode of FP LD, the ONU end points needs complicated temperature-control circuit, complex structure, and cost is higher.
Also find through retrieval; People such as T.Jayasinghe and C.J.Chae delivers " Scalability of RSOA-based multi-wavelength Ethernet PON architecture with dualfeeder fiber (having the extensibility research of double-fed lambda line optical fiber based on the multi-wavelength Ethernet optical-fiber network architecture of reflective semiconductor amplifier) " on Journal of Optical Networking 2007; A kind of multi-wavelength EPON structure of capacity smooth upgrade is proposed; In this structure; OLT sends one group of seed excitation light wave FLS, cuts apart through the power of distant-end node RN, sends to each ONU; In ONU, use and utilize filter to leach required seed excitation light wave, and upstream data is sent in modulation based on reflecting light amplifier RSOA.The transmitter module of ONU end is made up of optical filter filter and reflecting light amplifier RSOA; The output of reflecting light amplifier RSOA links to each other with the port of optical filter filter; Another port of optical filter filter links to each other with the branch road port of group wavelength division multiplexing CWDM as the output port of this transmitter module, and upstream data directly is modulated on the reflecting light amplifier RSOA.But this Technology Need sends the seed excitation wavelength from local side OLT, cuts apart through the power at distant-end node place, is sent to each ONU, and than ONU autoexcitation transmission technology, complex structure, cost are higher.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, the optical network unit apparatus of mutual excitation multi-wavelength dynamic scheduling in a kind of EPON is provided.The present invention is through using two FP Multi-Longitudinal Mode lasers that mode spacing is identical, and phase mutual excitation real estate is given birth to up light carrier, and uses tunable filter; The excitation wavelength of the up light carrier of Dynamic Selection; Increase the flexibility of uplink, improved up wavelength resource utilization, simple in structure; Cost is low, helps bandwidth intensive business or Distributed Calculation to be applied in the realization in the EPON.
The present invention realizes through following technical scheme:
The present invention includes: upstream data transmitter, downlink data receiver and the 3rd optical circulator; Wherein: the output of the 3rd optical circulator transmitting downlink data light signal that links to each other with the downlink data receiver, the input of the 3rd optical circulator transmit ascending data light signal that links to each other with the upstream data transmitter.
Described upstream data transmitter produces the upstream data light signal; Comprise: two FP Multi-Longitudinal Mode lasers, variable band-pass filter, two optical circulators, light shunt/coupler and control modules; Wherein: the output of a FP Multi-Longitudinal Mode laser links to each other with the input of variable band-pass filter and transmits many longitudinal modes light carrier; The control output end mouth of control module links to each other with variable band-pass filter and transmits the control signal of control passband centre wavelength; The output of variable band-pass filter links to each other with the I/O end of first optical circulator and transmits the single longitudinal mode light carrier; The output of first optical circulator links to each other with the input of second optical circulator and transmits the single longitudinal mode light carrier; The I/O end of second optical circulator links to each other with the output of the 2nd FP Multi-Longitudinal Mode laser and transmits single longitudinal mode upstream data light signal; The data-out port of the control module transmit ascending data signal of telecommunication that links to each other with the prevention at radio-frequency port of the 2nd FP Multi-Longitudinal Mode laser; The output of second optical circulator and light shunt/coupler close the road port transmission single longitudinal mode upstream data light signal that links to each other; A branch road port of light shunt/coupler links to each other with the input of first optical circulator and transmits single longitudinal mode upstream data light signal, and another minute road port of light shunt/coupler links to each other with the input of the 3rd optical circulator and transmits self-energizing single longitudinal mode upstream data light signal.
The mode spacing of described two FP Multi-Longitudinal Mode lasers is identical.
Described light shunt/coupler is that splitting ratio is 90: 10 1 * 2 a light shunt/coupler.
Described downlink data receiver recovers downlink data.
Described the 3rd optical circulator transmit ascending data light signal and downlink data light signal.
Compared with prior art; The present invention has following beneficial effect: have identical up multi-wavelength access capability; Increase the uplink bandwidth of ONU greatly, shared all up wavelength resources flexibly and effectively, improved up wavelength resource utilization; Satisfied the growth requirement that the user uplink access capability sharply increases; The capacity upgrade scheme of this low cost, high efficiency, colorless ONU for the development of optical access network of future generation provides a kind of technological reserve, helps bandwidth intensive business or Distributed Calculation to be applied in the realization in the EPON.
Description of drawings
Fig. 1 is that the structure of embodiment is formed sketch map;
Wherein: 1-the one FP Multi-Longitudinal Mode laser, 2-variable band-pass filter, 3-first optical circulator, 4-second optical circulator, 5-the 2nd FP Multi-Longitudinal Mode laser, 6-light shunt/coupler, 7-control module, 8-upstream data transmitter, 9-the 3rd optical circulator and 10-downlink data receiver.
Fig. 2 is embodiment figure as a result;
Wherein: (a) be two spectrograms that the FP Multi-Longitudinal Mode laser is freely exported in no autoexcitation; (b) be the optical power spectra figure that two FP Multi-Longitudinal Mode lasers are exported when mutual excitation; (c) be light carrier power output and the side mode suppression ratio that two FP Multi-Longitudinal Mode lasers produce when mutual excitation.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment provided detailed execution mode and process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment
As shown in Figure 1; Present embodiment comprises: upstream data transmitter 8, downlink data receiver 10 and the 3rd optical circulator 9; Wherein: the output of the 3rd optical circulator 9 transmitting downlink data light signal that links to each other with downlink data receiver 10, the input of the 3rd optical circulator 9 transmit ascending data light signal that links to each other with upstream data transmitter 8.
Described upstream data transmitter 8 produces the upstream data light signal; Comprise: a FP Multi-Longitudinal Mode laser 1 and the 2nd FP Multi-Longitudinal Mode laser 5, variable band-pass filter 2, first optical circulator 3, second optical circulator 4, splitting ratio are 90: 10 1 * 2 light shunt/coupler 6 and control module 7; Wherein: the output of a FP Multi-Longitudinal Mode laser 1 links to each other with the input of variable band-pass filter 2 and transmits many longitudinal modes light carrier; The control port of control module 7 links to each other with variable band-pass filter 2 and transmits the signal of control passband centre wavelength; The output of variable band-pass filter 2 links to each other with the I/O end of first optical circulator 3 and transmits the single longitudinal mode light carrier; The output of first optical circulator 3 links to each other with the input of second optical circulator 4 and transmits the single longitudinal mode light carrier; The I/O end of second optical circulator 4 links to each other with the output of the 2nd FP Multi-Longitudinal Mode laser 5 and transmits single longitudinal mode upstream data light signal; The data-out port of the control module 7 transmit ascending data signal of telecommunication that links to each other with the prevention at radio-frequency port of the 2nd FP Multi-Longitudinal Mode laser 5; The output of second optical circulator 4 and splitting ratio be 90: 10 1 * 2 light shunt/coupler 6 close the road port transmission single longitudinal mode upstream data light signal that links to each other; Splitting ratio is 10% fen road port of 90: 10 1 * 2 light shunt/coupler 6 transmission single longitudinal mode upstream data light signal that links to each other with the input of first optical circulator 3, and splitting ratio is that 90% fen road port of 90: 10 1 * 2 light shunt/coupler 6 links to each other with the input of the 3rd optical circulator 9 and transmits self-energizing single longitudinal mode upstream data light signal.
A described FP Multi-Longitudinal Mode laser 1 is identical with the mode spacing of the 2nd FP Multi-Longitudinal Mode laser 5, all is 1.34nm, and is biased in simultaneously under the room temperature environment of 28mA and 25 ℃.
Described control module 7 is sent upstream data and sending controling instruction.
The three dB bandwidth of described variable band-pass filter 2 is 0.4nm, and the insertion loss is 3.5dB.
Described downlink data receiver 10 is photoelectric detectors, and it recovers downlink data.
The I/O end transmit ascending data light signal and the downlink data light signal of described the 3rd optical circulator 9.
The course of work of present embodiment is: in upstream data transmitter 8; The output of the one FP Multi-Longitudinal Mode laser 1 links to each other with the input of variable band-pass filter 2 and transmits many longitudinal modes light carrier; The control port of control module 7 transmission of control signals that links to each other with variable band-pass filter 2; According to this control signal; The single longitudinal mode light carrier (its centre wavelength be 1550.0nm) of dynamic adjustments variable band-pass filter 2 to leach appointment; The output of variable band-pass filter 2 links to each other with the I/O end of first optical circulator 3 and transmits the single longitudinal mode light carrier; The output of first optical circulator 3 links to each other with the input of second optical circulator 4 and transmits the single longitudinal mode light carrier, and the I/O end of second optical circulator 4 links to each other with the output of the 2nd FP Multi-Longitudinal Mode laser 5, and the data-out port of control module 7 links to each other with the prevention at radio-frequency port of the 2nd FP Multi-Longitudinal Mode laser 5 and transmits the 1.25Gbit/s upstream data signal of telecommunication; Directly the upstream data signal of telecommunication is modulated on this single longitudinal mode light carrier of being excited, thereby produces 1.25Gbit/s upstream data light signal.The output of second optical circulator 4 and splitting ratio be 90: 10 1 * 2 light shunt/coupler 6 close the road port transmission single longitudinal mode upstream data light signal that links to each other; 10% fen road port of 1 * 2 light shunt/coupler 6 links to each other with the input of first optical circulator 3 and transmits single longitudinal mode upstream data light signal; Like this; First optical circulator 3, second optical circulator 4 and 1 * 2 light shunt/coupler 6 constitute a fiber optic loop; This single longitudinal mode upstream data light signal is through this fiber optic loop; Former road turns back to first ring of light device 3, variable band-pass filter 2 and a FP Multi-Longitudinal Mode laser 1, between a FP Multi-Longitudinal Mode laser 1 and the 2nd FP Multi-Longitudinal Mode laser 5, forms mutual excitation thus, 90% fen road port of 1 * 2 light shunt/coupler 6 self-energizing single longitudinal mode upstream data light signal of transmission that links to each other with the input of the 3rd optical circulator 9.
Two FP Multi-Longitudinal Mode lasers are that 28mA, temperature are under 25 ℃ of room temperature environments at bias current in the present embodiment; The spectrogram that no autoexcitation (without self-seeding) is freely exported is 1.34nm by the mode spacing of visible many longitudinal modes among Fig. 2 (a) shown in Fig. 2 (a); Two FP Multi-Longitudinal Mode lasers under the mutual excitation situation, adjustable extent be 1544.7nm between the 1563.4nm, the optical power spectra figure of output is shown in Fig. 2 (b); (side-mode suppression ratio is SMSR) shown in Fig. 2 (c) for light carrier power output Power that mutual excitation produces in the wavelengthtunable scope and side mode suppression ratio.Present embodiment respectively wavelength be obtain on 1556.67nm and the 1546.0nm maximum power output for-3.42dBm is 9.0dBm with minimum power output, side mode suppression ratio SMSR is to obtain maximum on the 1556.67nm at wavelength also, this maximum is 71.43dB.
Claims (3)
1. the optical network unit apparatus of mutual excitation multi-wavelength dynamic scheduling in the EPON; Comprise: upstream data transmitter, downlink data receiver and the 3rd optical circulator; It is characterized in that; The output of the 3rd optical circulator transmitting downlink data light signal that links to each other with the downlink data receiver, the input of the 3rd optical circulator transmit ascending data light signal that links to each other with the upstream data transmitter;
Described upstream data transmitter produces the upstream data light signal; Comprise: two Fabry-Paro FP Multi-Longitudinal Mode lasers, variable band-pass filter, two optical circulators, light shunt/coupler and control modules; Wherein: the output of first Fabry-Paro FP Multi-Longitudinal Mode laser links to each other with the input of variable band-pass filter and transmits many longitudinal modes light carrier; The control output end mouth of control module links to each other with variable band-pass filter and transmits the control signal of control passband centre wavelength; The output of variable band-pass filter links to each other with the I/O end of first optical circulator and transmits the single longitudinal mode light carrier; The output of first optical circulator links to each other with the input of second optical circulator and transmits the single longitudinal mode light carrier; The I/O end of second optical circulator links to each other with the output of second Fabry-Paro FP Multi-Longitudinal Mode laser and transmits single longitudinal mode upstream data light signal; The data-out port of the control module transmit ascending data signal of telecommunication that links to each other with the prevention at radio-frequency port of second Fabry-Paro FP Multi-Longitudinal Mode laser; The output of second optical circulator and light shunt/coupler close the road port transmission single longitudinal mode upstream data light signal that links to each other; A branch road port of light shunt/coupler links to each other with the input of first optical circulator and transmits single longitudinal mode upstream data light signal, and another minute road port of light shunt/coupler links to each other with the input of the 3rd optical circulator and transmits self-energizing single longitudinal mode upstream data light signal;
The mode spacing of described two Fabries-Paro FP Multi-Longitudinal Mode laser is identical.
2. the optical network unit apparatus of mutual excitation multi-wavelength dynamic scheduling is characterized in that in the EPON according to claim 1, and described light shunt/coupler is that splitting ratio is 90: 10 1 * 2 a light shunt/coupler.
3. the optical network unit apparatus of mutual excitation multi-wavelength dynamic scheduling is characterized in that in the EPON according to claim 1, and described downlink data receiver is a photoelectric detector.
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| CN103916179B (en) | 2014-03-28 | 2016-09-07 | 武汉光迅科技股份有限公司 | Method by local side optical line terminal monitoring user side tunable laser wavelength |
| WO2020069648A1 (en) * | 2018-10-02 | 2020-04-09 | Huawei Technologies Co., Ltd. | Transceiving with a predetermined frequency spacing |
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| CN101303507A (en) * | 2006-12-01 | 2008-11-12 | 华中科技大学 | Full optical wavelength converting device based on non-linear optical waveguide |
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| CN101303507A (en) * | 2006-12-01 | 2008-11-12 | 华中科技大学 | Full optical wavelength converting device based on non-linear optical waveguide |
Non-Patent Citations (2)
| Title |
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| Chien-Hung Yeh et al.Using four wavelength-multiplexed self-seeding Fabry-Perot lasers for 10 Gbps upstream traffic in TDM-PON.《OPTICS EXPRESS》.2008,第16卷(第23期),第1-6页. * |
| 李同伟等.一种改进的空分交换型OPS节点结构及其性能分析.《高技术通讯》.2008,第18卷(第8期),第778-782页. * |
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