CN102724012A - Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique - Google Patents
Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique Download PDFInfo
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Abstract
The invention provides a light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on the suppressed carrier modulation technique. The system comprises an optical line terminal, two feed-in line optical fibers, a remote node, 2N distributed optical fibers and 2N optical network units, wherein the optical line terminal comprises a shared light source transmitter, two downlink data transmitters, two uplink data receivers and two optical circulators; the remote node comprises two arrayed waveguide gratings, two optical circulators and an interconnected optical fiber; and each optical network unit comprises an optical coupler, a downlink receiver and a reflective semiconductor optical amplifier. The light-source-shared WDM-PON system based on the suppressed carrier modulation technique has the advantages that N laser devices are used for providing downlink light sources and uplink light sources for a pair of WDM-PONs so that network cost is saved, and uplink data and downlink data of each WDM-PON are transmitted in different feed-in line optical fibers so that influences of Rayleigh backscattering on transmission performance are avoided.
Description
Technical field
The present invention relates to the system in optical communication technique field; Especially be that a kind of carrier suppressed modulation technique of utilizing realizes the method that light source is shared in Wave division multiplexing passive optical network (WDM-PON), be specifically related to share the WDM-PON system based on the light source of carrier suppressed modulation technique.
Background technology
Fast development along with information technology; High definition television (High Definition TV; HDTV), the continuing to bring out and increase of emerging broadband services such as interactive entertainment, big file-sharing, video conference, broadband and the multi-business unified carrying and transmittability of Access Network are had higher requirement.(Passive Optical Network, PON) because its big bandwidth, advantage has been widely used in the Access Network field cheaply based on the EPON of optical fiber.
Traditional time division multiplexing EPON (Time Division Multiplexed Passive Optical Network; TDM-PON) in; A plurality of users utilize different time slots to realize sharing transmission, so each user's actual access bandwidth is restricted.Wave division multiplexing passive optical network (Wavelength Division Multiplexed Passive Optical Network; WDM-PON) distribute certain wavelengths for each user; Have bandwidth big, to protocol transparent; Advantages such as confidentiality is high, service quality is good are considered to the following mainstream solution of capacity Access Network greatly.
At present; The WDM-PON network to optical line terminal (Optical Line Terminal, OLT) and optical network unit (Optical Network Unit, ONU) light source at two ends; Modulators etc. are had relatively high expectations; The light source of OLT and ONU wherein, especially ONU one sidelight source installation and maintenance is with high costs, is unfavorable for the large scale deployment of WDM-PON.For reducing the cost in the practical application, require each ONU identical, can replace each other, promptly need use colorless ONU.
Existing colorless ONU realizes that technology generally is divided into following four kinds of schemes:
1, the wideband light source frequency spectrum is cut apart.Use narrow band filter that broadband spectral is cut apart back modulation upstream data.The cost of this scheme is lower, but its shortcoming is that the power of wide spectrum light source is less, cuts apart the back loss and increases, and causes the system power budget nervous, and intrinsic Mode Partition Noise, intensity noise and the beat frequency noise of wideband light source limited modulation rate simultaneously.
2, tunable laser.Administration's tunable laser according to the wavelength control instruction from the OLT end, selects the wavelength of appointment to carry out the upstream data modulation as light source in the ONU end.The shortcoming of this scheme is that cost is higher, and needs the wavelength control device, therefore less being used.
3, descending kind of light source injects modulation.OLT send to ONU be loaded with the downlink data light wave in, send the seed light that does not have data, this seed light can be cut apart by light source by the broadband and obtains or (Distributed Feedback, DFB) laser produces by distributed Feedback.The ONU end utilizes fabry-Perot type laser (the Fabry-Perot Laser Diode of injection locking; FPLD) or reflective semiconductor optical amplifier (Reflective Semiconductor Optical Amplifier RSOA) accomplishes the direct modulation of upward signal.The advantage of this scheme is that the ONU end does not need arbitrary source can realize colourlessization, and shortcoming is to affix one's name to one group of extra light source in the OLT end, has reduced the service efficiency of wavelength resource.Descending seed light and upward signal transmit in same optical fiber simultaneously, and transmission performance receives the influence of Rayleigh back scattering effect.
4, downstream signal remodulates.The maximum difference of this scheme and scheme 3 is that uplink and downlink signals is carried on the same wavelength.Descending light carrier is divided into two-way at ONU end, and a part is used for the demodulation downlink data, another part remodulates upstream data.Cost for fear of using modulator to bring at the ONU end is too high, and the gain saturation effect of general using RSOA is wiped the downstream signal that injects, and amplifies then and modulate to load upstream data.System transmissions speed based on the RSOA remodulates generally can reach 1.5Gbps at present.The advantage of this scheme is only just can realize that with one group of light source up-downgoing is transmitted and colourlessization of ONU, and shortcoming is the same with scheme 3, and the transmission of the uplink and downlink signals in same optical fiber all receives the influence of Rayleigh back scattering effect.
Such scheme all can be realized colorless ONU, and wherein the modulation rate of scheme 1 is lower, and scheme 2 costs are too high; And than scheme 3; The level of resources utilization of scheme 4 is higher, therefore adopts the downstream signal remodulates, is the main direction of studying that realizes low-cost WDM-PON.To this scheme, present research focus mainly concentrates on the cost that reduces the Rayleigh back scattering effect in the single fiber bi-directional transmission and reduce the ONU end, for the wavelength and the light source problem of practicing thrift the OLT end, then studies lessly, and relevant bibliographical information is also fewer.
Find through too much existing literature search; People such as Zaid A.EI-Sahn are at " OFC2011; Optical Fiber Communication Conference (U.S.'s optical communication meeting) " on delivered the article that is entitled as " Bidirectional WDM PON Enabled by Reflective ONUs and a Novel Overlapped-Subcarrier Multiplexing Technique "; Proposition utilizes frequency mixer that upward signal and radiofrequency signal are carried on the RSOA simultaneously at the ONU end, makes up remodulates signal loading on the subcarrier of former wavelength.This scheme utilizes RSOA to realize colourlessization ONU, and staggering of uplink and downlink centre wavelength can be reduced the influence of Rayleigh back scattering to transmission performance simultaneously.But the modulation bandwidth of RSOA has limited the side-play amount of subcarrier signal, so uplink and downlink signals has to a certain degree overlapping, still can receive the backward scattered influence of Rayleigh.
Find that through retrieval people such as Shu-Chuan Li have delivered the article that is entitled as " Cross-Seeding Schemes for WDM-Based Next-Generation Optical Access Networks " on " Journal of Lightwave Technology (lightwave technology magazine) " in 2011 again.This article proposes be divided into two groups to the ONU among the WDM PON, and the downstream wavelength of every group of ONU is transferred among another group ONU simultaneously carries out up remodulates.This scheme has realized colourlessization of ONU, has also eliminated the backward scattered influence of Rayleigh simultaneously.But the use of light source and wavelength all only is confined among the WDM-PON in this scheme, does not have further to improve the utilance of OLT end light source, and descending light signal will be transferred to two groups of ONU along separate routes simultaneously, has reduced the power budget of system.
Summary of the invention
Defective and deficiency to prior art; The objective of the invention is to is that two WDM-PON systems provide shared light source to improve resource utilization; Eliminate the Rayleigh back scattering problem that faces in the colorless ONU technology based on the downstream signal remodulates simultaneously; For reaching above purpose, the technical scheme that the present invention takes is:
According to an aspect of the present invention; Provide a kind of light source to share the WDM-PON system based on the carrier suppressed modulation technique; Comprise: optical line terminal, first feed-in linear light fibre, the second feed-in linear light fibre, distant-end node, 2N root distribution type fiber-optic and 2N optical network unit; Wherein, optical network unit 1-1,1-2 ... 1-N belongs to WDM-PON1, optical network unit 2-1,2-2 ... 2-N belongs to WDM-PON2; Optical line terminal is connected with the fine end of the second feed-in linear light with the first feed-in linear light is fine, and the first feed-in linear light is fine to be connected transmitting downlink data with the fine other end of the second feed-in linear light with distant-end node; Distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived each optical network unit, and adopts the intersection transmission manner, and the downstream signal of same WDM-PON is transmitted in different feed-in linear light fibres respectively with up remodulates signal; Each optical network unit demodulation downlink data, and downlink optical signal carried out remodulates, be transferred to distant-end node through distribution type fiber-optic and carry out uplink.
Preferably; Described optical line terminal comprises: share light emitted machine, first downstream data transmitter, second downstream data transmitter, first uplink receiver, second uplink receiver, first optical circulator, second optical circulator; Wherein: share the light emitted machine and produce N to the carrier suppressed light signal; Last lower sideband signal gets into first downstream data transmitter, second downstream data transmitter transmitting downlink data respectively; First optical circulator with uplink signal transmissions to the second uplink receiver demodulation upstream data, second optical circulator with uplink signal transmissions to the first uplink receiver demodulation upstream data.
Preferably; Described distant-end node comprises: the 3rd optical circulator, the 4th optical circulator, the 6th array waveguide grating, the 7th array waveguide grating and interconnected optical fiber; Wherein: 1 port of the 3rd optical circulator is connected with the first feed-in linear light is fine; 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 6th array waveguide grating, 3 ports are connected with interconnected optical fiber, and the other end of the 6th array waveguide grating is connected with distribution type fiber-optic; 1 port of the 4th optical circulator is connected with the second feed-in linear light is fine, and 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 7th array waveguide grating, and 3 ports are connected with interconnected optical fiber, and the other end of the 7th array waveguide grating is connected with distribution type fiber-optic; The downstream signal of the fine transmission of the first feed-in linear light sends to corresponding each optical network unit of WDM-PON1 that belongs to after by the 6th array waveguide grating demultiplexing, and the downstream signal of the fine transmission of the second feed-in linear light sends to corresponding each optical network unit of WDM-PON2 that belongs to after by the 7th array waveguide grating demultiplexing; Be subordinated to up remodulates signal that the optical network unit of WDM-PON1 returns by the 6th array waveguide grating wavelength division multiplexing after, from the 3 ports output of the 3rd optical circulator, fine to the second feed-in linear light through interconnected Optical Fiber Transmission; Be subordinated to up remodulates signal that the optical network unit of WDM-PON2 returns by the 7th array waveguide grating wavelength division multiplexing after, from the 3 ports output of the 4th optical circulator, fine to the first feed-in linear light through interconnected Optical Fiber Transmission.
Preferably; Described shared light emitted machine comprises: N laser, Mach zehnder modulators, radio-frequency signal generator; Erbium-doped fiber amplifier, dressing filter, first array waveguide grating, second array waveguide grating and tri-array waveguide optical grating; Wherein: the light that N laser sends gets into the Mach zehnder modulators through the multiplexing back of first array waveguide grating and produces a Double Sideband Suppressed Carrier signal, and a Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of Mach zehnder modulators connects erbium-doped fiber amplifier to amplify the carrier suppressed light signal; The delivery outlet of erbium-doped fiber amplifier is connected with the dressing filter and is used for upper sideband and the lower sideband that separate carrier suppresses signal; Upper side band signal gets into the downlink data that the transmission of first downstream data transmitter sends to WDM-PON1 after through the second array waveguide grating demultiplexing, and lower sideband signal gets into the downlink data that the transmission of second downstream data transmitter sends to WDM-PON2 after through tri-array waveguide optical grating demultiplexing.
Preferably; Described first downstream data transmitter comprises: N intensity modulator and the 4th array waveguide grating; Wherein: the input port of each intensity modulator connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 4th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 4th array waveguide grating and the first feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing;
Described second downstream data transmitter comprises: N intensity modulator and the 5th array waveguide grating; Wherein: the input port of each intensity modulator connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 5th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 5th array waveguide grating and the second feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing.
Preferably; Described optical network unit comprises: optical coupler, downlink receiver and reflective semiconductor optical amplifier; Wherein: the input port of optical coupler is connected with distribution type fiber-optic with the transmission downlink optical signal, and two other port of optical coupler is connected with reflective semiconductor optical amplifier with downlink receiver respectively, wherein; Part downlink optical signal gets into downlink receiver demodulation downlink data, and another part light signal gets into reflective semiconductor optical amplifier remodulates upstream data; Optical network unit is used for the reception of downlink data and the emission of up remodulates data.
Compared with prior art, the invention has the advantages that:
1) utilize the carrier suppressed modulation technique, one group of laser can be two WDM-PON systems provides light source, has improved resource utilization, thereby has reduced cost.
2) uplink and downlink all can adopt intensity modulated, realize simple; Up employing remodulates technology has been avoided the use of arbitrary source when realizing colourlessization of ONU.
3) distant-end node uses cross interconnected structure, makes the upward signal of the fine transmission of every feed-in linear light belong to different WDM-PON respectively with downstream signal and be modulated on the different sidebands influence of having avoided the Rayleigh back scattering that the uplink and downlink signal is transmitted.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, present embodiment provided detailed embodiment and concrete operating 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; In the present embodiment; Comprise according to system provided by the invention: optical line terminal, first feed-in linear light fibre, the second feed-in linear light fibre, distant-end node, 2N root distribution type fiber-optic and 2N optical network unit; Wherein, optical network unit 1-1,1-2 ... 1-N belongs to WDM-PON1, optical network unit 2-1,2-2 ... 2-N belongs to WDM-PON2; Optical line terminal is connected with the fine end of the second feed-in linear light with the first feed-in linear light is fine, and the first feed-in linear light is fine to be connected transmitting downlink data with the fine other end of the second feed-in linear light with distant-end node; Distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived each optical network unit, and adopts the intersection transmission manner, and the downstream signal of same WDM-PON is transmitted in different feed-in linear light fibres respectively with up remodulates signal; Each optical network unit demodulation downlink data, and downlink optical signal carried out remodulates, be transferred to distant-end node through distribution type fiber-optic and carry out uplink.
Preferably; Described optical line terminal comprises: share light emitted machine, first downstream data transmitter, second downstream data transmitter, first uplink receiver, second uplink receiver, first optical circulator, second optical circulator; Wherein: share the light emitted machine and produce N to the carrier suppressed light signal; Last lower sideband signal gets into first downstream data transmitter, second downstream data transmitter transmitting downlink data respectively; First optical circulator with uplink signal transmissions to the second uplink receiver demodulation upstream data, second optical circulator with uplink signal transmissions to the first uplink receiver demodulation upstream data.
Preferably; Described distant-end node comprises: the 3rd optical circulator, the 4th optical circulator, the 6th array waveguide grating, the 7th array waveguide grating and interconnected optical fiber; Wherein: 1 port of the 3rd optical circulator is connected with the first feed-in linear light is fine; 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 6th array waveguide grating; 3 ports are connected with interconnected optical fiber, the other end of the 6th array waveguide grating be connected with distribution type fiber-optic with descending wavelength-division demultiplexed signal send to respectively optical network unit 1-1,1-2 ... 1-N; 1 port of the 4th optical circulator is connected with the second feed-in linear light is fine; 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 7th array waveguide grating; 3 ports are connected with interconnected optical fiber, the other end of the 7th array waveguide grating be connected with distribution type fiber-optic with descending wavelength-division demultiplexed signal send to respectively optical network unit 2-1,2-2 ... 2-N; The downstream signal of the fine transmission of the first feed-in linear light sends to corresponding each optical network unit of WDM-PON1 that belongs to after by the 6th array waveguide grating demultiplexing, and the downstream signal of the fine transmission of the second feed-in linear light sends to corresponding each optical network unit of WDM-PON2 that belongs to after by the 7th array waveguide grating demultiplexing; Be subordinated to WDM-PON1 optical network unit 1-1,1-2 ... The up remodulates signal that 1-N returns by the 6th array waveguide grating wavelength division multiplexing after, from the output of 3 ports of the 3rd optical circulator, fine to the second feed-in linear light through interconnected Optical Fiber Transmission; Be subordinated to WDM-PON2 optical network unit 2-1,2-2 ... The up remodulates signal that 2-N returns by the 7th array waveguide grating wavelength division multiplexing after, from the output of 3 ports of the 4th optical circulator, fine to the first feed-in linear light through interconnected Optical Fiber Transmission.
Preferably; Described shared light emitted machine comprises: N laser, Mach zehnder modulators, radio-frequency signal generator; Erbium-doped fiber amplifier, dressing filter, first array waveguide grating, second array waveguide grating and tri-array waveguide optical grating; Wherein: the light that N laser sends gets into the Mach zehnder modulators through the multiplexing back of first array waveguide grating and produces a Double Sideband Suppressed Carrier signal, and a Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of Mach zehnder modulators connects erbium-doped fiber amplifier to amplify the carrier suppressed light signal; The delivery outlet of erbium-doped fiber amplifier is connected with the dressing filter and is used for upper sideband and the lower sideband that separate carrier suppresses signal; Upper side band signal gets into the downlink data that the transmission of first downstream data transmitter sends to WDM-PON1 after through the second array waveguide grating demultiplexing, and lower sideband signal gets into the downlink data that the transmission of second downstream data transmitter sends to WDM-PON2 after through tri-array waveguide optical grating demultiplexing.
Preferably; Described first downstream data transmitter comprises: N intensity modulator and the 4th array waveguide grating; Wherein: intensity modulator 1-1,1-2 ... The input port of 1-N connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 4th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 4th array waveguide grating and the first feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing;
Described second downstream data transmitter comprises: N intensity modulator and the 5th array waveguide grating; Wherein: intensity modulator 2-1,2-2 ... The input port of 2-N connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 5th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 5th array waveguide grating and the second feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing.
Preferably; Described optical network unit comprises: optical coupler, downlink receiver and reflective semiconductor optical amplifier; Wherein: the input port of optical coupler is connected with distribution type fiber-optic with the transmission downlink optical signal, and two other port of optical coupler is connected with reflective semiconductor optical amplifier with downlink receiver respectively, wherein; Part downlink optical signal gets into downlink receiver demodulation downlink data, and another part light signal gets into reflective semiconductor optical amplifier remodulates upstream data; Optical network unit is used for the reception of downlink data and the emission of up remodulates data.
Compared with prior art, the advantage of present embodiment is:
1) utilize the carrier suppressed modulation technique, one group of laser can be two WDM-PON systems provides light source to improve resource utilization, thereby has reduced cost.
2) uplink and downlink all can adopt intensity modulated, realize simple; Up employing remodulates technology has been avoided the use of arbitrary source when realizing colourlessization of ONU.
3) distant-end node uses cross interconnected structure, and the upward signal of the every fine transmission of feed-in linear light belongs to different WDM-PON respectively with downstream signal and is modulated on the different sidebands, has avoided the influence of Rayleigh back scattering to the transmission of uplink and downlink signal.
Claims (6)
1. the light source based on the carrier suppressed modulation technique is shared the WDM-PON system; It is characterized in that; Comprise: optical line terminal, first feed-in linear light fibre, the second feed-in linear light fibre, distant-end node, 2N root distribution type fiber-optic and 2N optical network unit; Wherein, optical network unit 1-1,1-2 ... 1-N belongs to WDM-PON1, optical network unit 2-1,2-2 ... 2-N belongs to WDM-PON2; Optical line terminal is connected with the fine end of the second feed-in linear light with the first feed-in linear light is fine, and the first feed-in linear light is fine to be connected transmitting downlink data with the fine other end of the second feed-in linear light with distant-end node; Distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived each optical network unit, and adopts the intersection transmission manner, and the downstream signal of same WDM-PON is transmitted in different feed-in linear light fibres respectively with up remodulates signal; Each optical network unit demodulation downlink data, and downlink optical signal carried out remodulates, be transferred to distant-end node through distribution type fiber-optic and carry out uplink.
2. the light source based on the carrier suppressed modulation technique according to claim 1 is shared the WDM-PON system; It is characterized in that; Described optical line terminal comprises: share light emitted machine, first downstream data transmitter, second downstream data transmitter, first uplink receiver, second uplink receiver, first optical circulator, second optical circulator; Wherein: share the light emitted machine and produce N to the carrier suppressed light signal; Last lower sideband signal gets into first downstream data transmitter, second downstream data transmitter transmitting downlink data respectively; First optical circulator with uplink signal transmissions to the second uplink receiver demodulation upstream data, second optical circulator with uplink signal transmissions to the first uplink receiver demodulation upstream data.
3. the light source based on the carrier suppressed modulation technique according to claim 1 is shared the WDM-PON system; It is characterized in that; Described distant-end node comprises: the 3rd optical circulator, the 4th optical circulator, the 6th array waveguide grating, the 7th array waveguide grating and interconnected optical fiber; Wherein: 1 port of the 3rd optical circulator is connected with the first feed-in linear light is fine; 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 6th array waveguide grating, 3 ports are connected with interconnected optical fiber, and the other end of the 6th array waveguide grating is connected with distribution type fiber-optic descending wavelength-division demultiplexed signal is sent to the optical network unit that belongs to WDM-PON1 respectively; 1 port of the 4th optical circulator is connected with the second feed-in linear light is fine; 2 ports are connected the descending wavelength-division multiplex signals of transmission with an end of the 7th array waveguide grating; 3 ports are connected with interconnected optical fiber, and the other end of the 7th array waveguide grating is connected with distribution type fiber-optic descending wavelength-division demultiplexed signal is sent to the optical network unit that belongs to WDM-PON2 respectively; The downstream signal of the fine transmission of the first feed-in linear light sends to corresponding each optical network unit that belongs to WDM-PON1 after by the 6th array waveguide grating demultiplexing, and the downstream signal of the fine transmission of the second feed-in linear light sends to corresponding each optical network unit that belongs to WDM-PON2 after by the 7th array waveguide grating demultiplexing; Be subordinated to up remodulates signal that the optical network unit of WDM-PON1 returns by the 6th array waveguide grating wavelength division multiplexing after, from the 3 ports output of the 3rd optical circulator, fine to the second feed-in linear light through interconnected Optical Fiber Transmission; Be subordinated to up remodulates signal that the optical network unit of WDM-PON2 returns by the 7th array waveguide grating wavelength division multiplexing after, from the 3 ports output of the 4th optical circulator, fine to the first feed-in linear light through interconnected Optical Fiber Transmission.
4. the light source based on the carrier suppressed modulation technique according to claim 1 is shared the WDM-PON system; It is characterized in that; Described shared light emitted machine comprises: N laser, Mach zehnder modulators, radio-frequency signal generator; Erbium-doped fiber amplifier, dressing filter, first array waveguide grating, second array waveguide grating and tri-array waveguide optical grating; Wherein: the light that N laser sends gets into the Mach zehnder modulators through the multiplexing back of first array waveguide grating and produces a Double Sideband Suppressed Carrier signal, and a Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of Mach zehnder modulators connects erbium-doped fiber amplifier to amplify the carrier suppressed light signal; The delivery outlet of erbium-doped fiber amplifier is connected with the dressing filter and is used for upper sideband and the lower sideband that separate carrier suppresses signal; Upper side band signal gets into the downlink data that the transmission of first downstream data transmitter sends to WDM-PON1 after through the second array waveguide grating demultiplexing, and lower sideband signal gets into the downlink data that the transmission of second downstream data transmitter sends to WDM-PON2 after through tri-array waveguide optical grating demultiplexing.
5. the light source based on the carrier suppressed modulation technique according to claim 1 is shared the WDM-PON system; It is characterized in that; Described first downstream data transmitter comprises: N intensity modulator and the 4th array waveguide grating; Wherein: the input port of each intensity modulator connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 4th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 4th array waveguide grating and the first feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing;
Described second downstream data transmitter comprises: N intensity modulator and the 5th array waveguide grating; Wherein: the input port of each intensity modulator connects with the corresponding delivery outlet of shared light emitted machine; The corresponding input port of the delivery outlet of each intensity modulator and the 5th array waveguide grating connects the transmission downlink optical signal, and the delivery outlet of the 5th array waveguide grating and the second feed-in linear light be fine to be connected the downlink optical signal that transmits behind the wavelength division multiplexing.
6. the light source based on the carrier suppressed modulation technique according to claim 4 is shared the WDM-PON system; It is characterized in that; Described optical network unit comprises: optical coupler, downlink receiver and reflective semiconductor optical amplifier; Wherein: the input port of optical coupler is connected with distribution type fiber-optic with the transmission downlink optical signal, and two other port of optical coupler is connected with reflective semiconductor optical amplifier with downlink receiver respectively, wherein; Part downlink optical signal gets into downlink receiver demodulation downlink data, and another part light signal gets into reflective semiconductor optical amplifier remodulates upstream data; Optical network unit is used for the reception of downlink data and the emission of up remodulates data.
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| CN103916206B (en) * | 2014-03-31 | 2017-05-10 | 上海交通大学 | Double-WDM-PON network system with mutual protection mechanism and method thereof |
| CN104243045A (en) * | 2014-09-10 | 2014-12-24 | 上海交通大学 | Down transmitter applied to DWDM-PON system and system |
| CN104836624A (en) * | 2015-04-17 | 2015-08-12 | 东南大学 | Centralized protection passive optical network system based on optical carrier suppression technology |
| WO2017193600A1 (en) * | 2016-05-11 | 2017-11-16 | 中天宽带技术有限公司 | Communication apparatus based on ultra-narrow band spectrum segmentation incoherent light source and self-adaptive threshold regulation and control in wdm-pon system |
| CN111431602A (en) * | 2019-01-10 | 2020-07-17 | 中国移动通信有限公司研究院 | Forward transmission network system and light source generation method thereof |
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| CN117908199A (en) * | 2024-01-17 | 2024-04-19 | 希烽光电科技(南京)有限公司 | Active optical cable of sharing light source |
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