CN205754341U - A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system - Google Patents
A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system Download PDFInfo
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- CN205754341U CN205754341U CN201620421570.2U CN201620421570U CN205754341U CN 205754341 U CN205754341 U CN 205754341U CN 201620421570 U CN201620421570 U CN 201620421570U CN 205754341 U CN205754341 U CN 205754341U
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Abstract
The utility model discloses a kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP SOA in WDM PON downlink communication system, including central station, Transmission Fibers, distant-end node and ONT Optical Network Terminal, described distant-end node is connected with central station by Transmission Fibers, described ONT Optical Network Terminal is connected with distant-end node, described central station includes the wide range incoherent light source being sequentially connected with, FFP wave filter, FFP SOA, first order array waveguide grating, multiple photomodulators and second level array waveguide grating, the two ends of the plurality of photomodulator are connected with first order array waveguide grating and second level array waveguide grating respectively.Ultra-narrow band spectrum segmentation incoherent light source after FFP SOA amplifies can realize the compression of multichannel spectrum carving incoherent light source intensity noise, effectively suppress dispersive influence, it is adaptable to remote dense wave division multipurpose light passive network (DWDM PON) communication system.
Description
Technical field
This utility model belongs to communication technical field, a kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system.
Background technology
EPON (PON) is considered as to solve the technology of the most critical of " last one kilometer " in access network, plays an important role in realizing FTTX." passive " refers to do not have the optical passive component compositions such as any active device, only bonder, Wavelength division multiplexer/demultiplexer, circulator in Optical Distribution Node (ODN), greatly reduces the cost that management is safeguarded.
PON can be divided into power Splittable EPON (PSPON) and wavelength division multiplexing type EPON (WDM-PON) by signal distribution.APON, BPON, EPON, GPON belong to PSPON.PSPON uses star coupler branch, up, descending transmission to use TDMA/TDM mode, it is achieved channel width is shared, and the signal that OLT is sent by optical branching device is assigned on each optical network unit (Optical Network Unit, ONU).WDM-PON is then fully to use wavelength-division multiplex technique, and by Wave division multiplexer/demultiplexer (such as array waveguide grating AWG) by the flashlight of different wave length separately, each wavelength can single modulated signal, it is achieved the bandwidth in complete meaning exclusively enjoys.
Although PSPON is the most ripe, particularly EPON, GPON in North America, Japan had fairly large deployment, but PSPON yet suffers from key issue to be needed to solve, such as fast bit synchronization, Dynamic Bandwidth Allocation, baseline drift, range finding and compensation of delay, the design etc. of burst mode optical transceiver module of ONU.Although some problems are resolved, but relatively costly.WDM-PON then uses wavelength to identify as user side, utilizes wavelength-division multiplex technique, it is provided that wider bandwidth of operation, it is achieved symmetrical broadband access.In addition to this it is possible to avoid many technological difficulties such as the range finding of ONU, fast bit synchronization in tdma, at aspects such as system upgrade performances, there is clear superiority.
But, along with the effect of dispersion of the increase of WDM-PON system access distance, fibre-optical dispersion and Waveguide array can cause the increase of error rate of system.It is now recognized that the method that can solve effect of dispersion better is Dispersion Compensation Fiber Gratings, improve dispersion characteristics by adding compensated optical fiber grating in AWG.The essence of dispersion compensation is that the pulse stretching that the quadratic phase shift to frequency is caused is compressed compensating.
Utility model content
For solving above-mentioned technical problem, this utility model provides a kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system, effectively inhibition strength influence of noise, it is adaptable to remote DWDM-PON communication system.
nullThis utility model is by the following technical solutions: a kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system，Including central station (CO)，Transmission Fibers，Distant-end node (RN) and ONT Optical Network Terminal (ONU)，Described distant-end node is connected with central station by Transmission Fibers，Described ONT Optical Network Terminal is connected with distant-end node，Described central station includes the wide range incoherent light source for inciding downstream signal being sequentially connected with、FFP wave filter (fabry-perot filter)、FFP-SOA(Fabry-Perot semiconductor optical amplifier)、First order array waveguide grating (AWG1)、Multiple photomodulators and second level array waveguide grating (AWG2)，The two ends of the plurality of photomodulator are connected with first order array waveguide grating and second level array waveguide grating respectively，Wherein，FFP wave filter is used for cutting wide range incoherent light source signal，Produce and export multi-wavelength ultra-narrow band spectrum segmentation incoherent light source，FFP-SOA has low saturation power，Need to work in saturation operation region，Ultra-narrow band spectrum segmentation incoherent light source for non-linear amplification different wave length，And utilize the intensity noise of non-linear amplification characteristic compression multi-wavelength ultra-narrow band spectrum segmentation incoherent light source simultaneously，Multiple photomodulators are for modulating the signal to the ultra-narrow band spectrum segmentation incoherent light source of noise each wavelength downtrod，3-dB system transfers performance can be strengthened by polarization insensitive electric absorption photomodulator.Utilize the FFP wave filter with ultra-narrow bandwidth that wide range incoherent light source cutting is obtained multi-wavelength ultra-narrow band spectrum segmentation incoherent light source signal, multi-wavelength ultra-narrow band spectrum segmentation incoherent light source signal is amplified and utilizes the intensity noise in non-linear amplification characteristic compression multi-wavelength ultra-narrow band spectrum segmentation incoherent light source by the FFP-SOA being in saturation operation region, correspond in corresponding wavelength channel by the Different lightwave length of first order array waveguide grating (AWG1) distribution ultra-narrow band spectrum segmentation incoherent light source afterwards, and modulate each circuit-switched data information of loading, wavelength-division multiplex is realized again by second level array waveguide grating (AWG2), then transmitted to distant-end node RN by Transmission Fibers, Wave Decomposition multiplexing is realized at distant-end node, finally data are distributed to ONT Optical Network Terminal ONU.ONT Optical Network Terminal realizes the transmission solving mediation upstream data of downlink data.
Described distant-end node includes third level array waveguide grating (AWG3) or film filter, is connected to central station by Transmission Fibers, the optical signal sent from central station CO after AWG3 Wave Decomposition multiplexing, output to distributed optical communication link.
Described ONT Optical Network Terminal includes the multiple optical receivers being connected with distant-end node.Optical receiver and three demultiplexers/wavelength division multiplexer (such as AWG3) are connected.Described optical receiver comprises photodiode, the first band filter and decoder.
Described wide range incoherent light source is realized by high power erbium-doped fiber amplifier, light emitting diode, super-radiance light emitting diode or fabry-Perot laser diode spectroscopic light source.
Described FFP wave filter needs all with the channel spacing of FFP-SOA and the communication channel interval of WDM-PON system is consistent.
Described FFP-SOA works in saturation operation region, utilizes the non-linear amplification characteristic of saturation operation region to reach to compress the purpose of intensity noise in light source.
The temperature of described FFP wave filter and FFP-SOA is controlled by TEC.
The plurality of photomodulator uses the on-off keying modulation system having preferable resistance to intensity noise.
Being provided with preposition Error Correction of Coding before described photomodulator, ONT Optical Network Terminal is provided with preposition error correction decoding to strengthen the noise resistance of system.
In this utility model, FFP wave filter (fabry-perot filter) is a kind of super narrow band filter, it is also possible to uses Gaussian filter or has the fiber grating filter of Lorentz lorentz's shape.
This utility model can use preposition Error Correction of Coding at transmitting terminal, and use preposition error correction decoding to strengthen the noise resistance of system after the self feed back threshold value decision circuit of receiving terminal.
The utility model has the advantages that: ultra-narrow band spectrum segmentation incoherent light source of the present utility model is to utilize FFP wave filter to EDFA Erbium-Doped Fiber Amplifier (Erbium Doped Fiber
Amplifier, EDFA) wide range amplified spontaneous emission source (the Amplified Spontaneous that produces
Emission, ASE) it is filtered, and obtained by FFP-SOA amplification, its live width is less than 700MHz, ultra-narrow band spectrum segmentation incoherent light source after FFP-SOA amplifies can realize the compression of multichannel spectrum segmentation incoherent light source intensity noise, effectively suppress dispersive influence, it is adaptable to remote dense wave division multipurpose light passive network (DWDM-PON) communication system.
Accompanying drawing explanation
Fig. 1 is the WDM-PON view of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA；
Fig. 2 is employing ultra-narrow band spectrum segmentation light source relative intensity noise spectrogram before and after FFP-SOA in WDM-PON system；
Fig. 3 is the schematic diagram of intensity noise in the FFP-SOA compression light source utilizing and being operated in saturation operation region；
Fig. 4 is in the WDM-PON system utilizing FFP wave filter and FFP-SOA, is positioned at the bit error rate and the graph of a relation of transmission range of 1542nm wavelength channel transmission 25-Gb/s OOK signal；
Fig. 5 is in the WDM-PON system of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA, the bit error rate performance of different wave length passage in back-to-back system (CCC-0).
Detailed description of the invention
In order to deepen understanding of the present utility model, being described in further detail of the present utility model below in conjunction with embodiment and accompanying drawing, this embodiment is only used for explaining this utility model, is not intended that the restriction to protection domain of the present utility model.
As shown in Figure 1, a kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system, including central station (CO), Transmission Fibers (selection single-mode fiber), distant-end node (RN) and ONT Optical Network Terminal (ONU), distant-end node is connected with central station by Transmission Fibers, and ONT Optical Network Terminal is connected with distant-end node.
Central station includes wide range incoherent light source BLS for inciding downstream signal, have chosen the spontaneous amplification divergent light source that high power erbium-doped fiber amplifier produces in the present embodiment；For the super narrow bandpass optical filters of cutting wide range incoherent light source, the present embodiment have chosen FFP wave filter (fabry-perot filter)；For by the ultra-narrow band spectrum segmentation non-linear amplification of incoherent light source signal of different wave length and utilize the FFP-SOA(Fabry-Perot semiconductor optical amplifier of intensity noise in non-linear amplification characteristic compression light sources with different wavelengths)；Different wave length ultra-narrow band spectrum segmentation incoherent light source is separated to the first multichannel separation coupling device of respective channel, the present embodiment is selected first order array waveguide grating (AWG1)；Multiple photomodulators, for modulating the signal to the ultra-narrow band spectrum segmentation incoherent light source of noise each wavelength downtrod, enhancing signal signal to noise ratio can be carried out by polarization insensitive electric absorption photomodulator, strengthening 3-dB system transfers performance, signal has first passed through preposition Error Correction of Coding before carrying out light modulation；With the second wavelength division multiplexer coupled by multichannel downstream signal, the present embodiment is selected second level array waveguide grating (AWG2).Wherein, FFP wave filter and the channel spacing of FFP-SOA should and the communication channel interval of WDM-PON system consistent, FFP-SOA needs to be operated in saturation operation region, and need the widest operating wavelength range, realize the intensity noise of all WDM-PON system light sources with different wavelengths being suppressed simultaneously, the ultra-narrow band spectrum segmentation incoherent light source signal of the different wave length that FFP wave filter cutting obtains has the biggest intensity noise in low frequency range, maximum near DC area noise, and with the live width of light source is inversely proportional to (live width of relative noise intensity=1/ surpass narrow band spectrum cutting incoherent light source).
Distant-end node includes the three wavelength division multiplexers/demultiplexer separated for wavelength-division multiplex/multichannel, is connected to central station by Transmission Fibers；The present embodiment is selected third level array waveguide grating (AWG3), the optical signal sent from central station CO after AWG3 Wave Decomposition multiplexing, output to distributed optical communication link.
ONT Optical Network Terminal includes the multiple optical receivers being connected with distant-end node.Optical receiver and three wavelength division multiplexers/demultiplexer are connected, and choose AWG3 in the present embodiment.Optical receiver comprises photodiode, the first band filter and decoder.
As in figure 2 it is shown, compare employing ultra-narrow band spectrum segmentation light source relative intensity noise spectrogram before and after FFP-SOA in WDM-PON system.The wave spectrum cutting incoherent light source of ultra-narrow band 700-MHz live width is then concentrated mainly on low frequency region.Utilizing the FFP-SOA being operated in zone of saturation can effectively reduce intensity noise, relative intensity noise is reduced to-118dB/Hz (scope of nearly direct current) from-90dB/Hz.
As shown in Figure 3, the FFP-SOA being operated in zone of saturation is utilized to compress the principle of the intensity noise in light source: the FFP-SOA being operated in zone of saturation has non-linear amplification feature, i.e. the amplification of low-power input signal is much larger than the amplification of high power input signal, utilize this characteristic can compress the intensity noise in light source, it is thus achieved that the light signal that relative intensity is stable.
As shown in Figure 4, in WDM-PON system, when being positioned at the channel transfer 25Gb/s signal of 1542nm, after utilizing the intensity noise in Saturated optical fiber amplifier compression light source, the bit error rate of signal and the relation of signal transmission distance.
As it is shown in figure 5, in WDM-PON system, in transmission back-to-back, the bit error rate (being provided without preposition error correction decoding) of different wave length channel transfer 25Gb/s OOK signal.
Claims (10)
- null1. the transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system，It is characterized in that，Including central station，Transmission Fibers，Distant-end node and ONT Optical Network Terminal，Described distant-end node is connected with central station by Transmission Fibers，Described ONT Optical Network Terminal is connected with distant-end node，Described central station includes the wide range incoherent light source being sequentially connected with、FFP wave filter、FFP-SOA、First order array waveguide grating、Multiple photomodulators and second level array waveguide grating，The two ends of the plurality of photomodulator are connected with first order array waveguide grating and second level array waveguide grating respectively，Utilize FFP wave filter that wide range incoherent light source cutting is obtained multi-wavelength ultra-narrow band spectrum segmentation incoherent light source，Followed by working in the FFP-SOA of saturation to compress the intensity noise of multi-wavelength ultra-narrow band spectrum segmentation incoherent light source，Pass through first order array waveguide grating branch afterwards and load each circuit-switched data information，Wavelength-division multiplex is realized again by second level array waveguide grating，Then transmitted to distant-end node by Transmission Fibers，Wave Decomposition multiplexing is realized at distant-end node，Finally data are distributed to ONT Optical Network Terminal.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, described distant-end node includes third level array waveguide grating or film filter.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, described ONT Optical Network Terminal includes the multiple optical receivers being connected with distant-end node.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 3, it is characterized in that, described optical receiver comprises photodiode, the first band filter and decoder.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, described wide range incoherent light source is realized by high power erbium-doped fiber amplifier, light emitting diode, super-radiance light emitting diode or fabry-Perot laser diode spectroscopic light source.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, described FFP wave filter needs all with the channel spacing of FFP-SOA and the communication channel interval of WDM-PON system is consistent.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, described FFP-SOA works in saturation operation region, utilizes the non-linear amplification characteristic of saturation operation region to reach to compress the purpose of intensity noise in light source.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterised in that the temperature of described FFP wave filter and FFP-SOA is controlled by TEC.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, the plurality of photomodulator uses the on-off keying modulation system having resistance to intensity noise.
- A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system the most according to claim 1, it is characterized in that, being provided with preposition Error Correction of Coding before described photomodulator, ONT Optical Network Terminal is provided with preposition error correction decoding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827320A (en) * | 2016-05-11 | 2016-08-03 | 中天宽带技术有限公司 | Transmission device of ultra-narrow bandwidth spectrum segmentation incoherent light source based on FFP filter and FFP-SOA applied to WDM-PON |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827320A (en) * | 2016-05-11 | 2016-08-03 | 中天宽带技术有限公司 | Transmission device of ultra-narrow bandwidth spectrum segmentation incoherent light source based on FFP filter and FFP-SOA applied to WDM-PON |
| 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 |
| WO2017193601A1 (en) * | 2016-05-11 | 2017-11-16 | 中天宽带技术有限公司 | Transmission apparatus for ultra-narrow band spectrum segmentation incoherent light source based on ffp filter and ffp-soa in wdm-pon |
| CN105827320B (en) * | 2016-05-11 | 2018-07-27 | 中天宽带技术有限公司 | A kind of transmitting device of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source in WDM-PON |
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