CN101662707B - Method and device for sharing broadband light source in a plurality of WDM-PON systems - Google Patents
Method and device for sharing broadband light source in a plurality of WDM-PON systems Download PDFInfo
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Abstract
The invention discloses a method and a device for sharing broadband light sources in a plurality of WDM-PON systems. The device comprises two broadband light sources, a first light-way divider dividing broadband light into multiplexed outputs, an automatic protection switch unit, a plurality of light amplification units, a first 1*2 fibre optic coupler and a routing unit, wherein the fibre optic coupler divides the broadband light output by the first light-way divider into uplink broadband light and downlink broadband light according to a wave band; the routing unit routes the downlink broadband light output by the first port of the 1*2 fibre optic coupler to OLT so as to load a downlink signal, and routes the uplink broadband light output by the second port to ONU so as to load an uplinksignal. The invention realizes that the broadband light sources are shared in a plurality of WDM-PON systems through the routing unit consisting of the fibre optic coupler and a circulator, and has an automatic switch protection function of the broadband light source, thereby increasing the system reliability and reducing the system cost. The invention is suitable for being applied to commercialized WDM-PON systems.
Description
Technical field
The present invention relates to Wave division multiplexing passive optical network, particularly relate to the method and apparatus of the shared wideband light source of a kind of a plurality of WDM-PON systems.
Background technology
Traditional access way of data service comprises dialing modem (MOdulator-DEModulator, MODEM), ADSL (Asymmetric Digital Subscriber Line) (Asymmetrical Digital Subscriber Line, ADSL), cable modem (Cable Modulator-demodulator, CM) and very-high-bit-rate digital subscriber loop (Very-high-bit-rate Digital Subscriber Loop, VDSL), the speed of these several access waies does not wait to several million from 56kbps.In recent years, because new business continues to bring out, therefore the bandwidth of Access Network is had higher requirement, online HDTV (High-Definition Television) (High DefinitionTelevision for example, HDTV) etc. each user of high-quality business need has the bandwidth about 100Mbps, use second generation HDSL High-Speed Digital Subscriber Line can satisfy these professional needs substantially, but this technology still adopts copper cable as transmission medium, can't satisfy the bandwidth demand of more business in expected future, and the copper cable cost is high in recent years, and operator need bear higher O﹠M cost.And based on EPON (the Passive Optical Network of optical fiber, PON) have cost and superiority bandwidth, easy care more, therefore replace copper cable as a token of Fiber to the home (Fiber To The Home with optical fiber in recent years, FTTH) engineering has been subjected to extensive concern, and is applied in the Access Network field on a large scale.
Typical PON structure comprises that one is positioned at the local side apparatus OLT of CO side, a passive optical distribution network (Optical Distribution Network, ODN) and be positioned at optical network unit (the OpticalNetwork Unit of user's side, ONU) or Optical Network Terminal (Optical Network Terminal, ONT).Difference according to implementation, PON can be divided into EPON (the ATMPassive Optical Network based on asynchronous transfer mode, APON), EPON (EthernetPassive Optical Network based on Ethernet, EPON), gigabit passive optical network (Gigabit-capablePassive Optical Network, GPON) and Wave division multiplexing passive optical network (Wavelength-Division-Multiplexed Passive Optical Network, WDM-PON).Two layers of APON adopt ATM encapsulation and tranmission techniques, and there are bandwidth deficiency, technical sophistication, cost is higher and is not suitable for the problem of bearer IP service, so not seen widespread use; The time division multiplexing mode of all utilizing EPON and GPON realizes sharing transmission, each user is distributed specific time slot, and WDM-PON distributes certain wavelengths for each user, adopts the technology of wavelength division multiplexing to realize link sharing.Therefore compare with other several implementations, WDM-PON logically is the structure of point-to-point, to protocol transparent, and confidentiality is better, adopts wave division multiplex mode simultaneously, and higher access rate can be provided, have better service quality (Quality of Service, QoS).Based on above some, WDM-PON is considered to representing the developing direction of Access Network.
The major obstacle that faces in the large-scale application of WDM-PON is the light source problem of OLT and ONU side, it is evident that, operator and user are more responsive to ONU sidelight source installation and maintenance cost, but in actual application, need mutual alternative between each ONU, operator does not need to lay in a kind of particular device for each wavelength, thereby reduce the installation and maintenance cost, namely need to adopt colorless ONU.
ONU sidelight source mainly contains following several solution at present:
1.DFB laser.Adopt Distributed Feedback Laser as light source in this scheme, directly modulation rate can reach 10Gbps, but the installation and maintenance cost is very high, is difficult to practicability.
2. tunable laser.Each ONU uses tunable laser as light source, and wavelength regulation is arrived preassigned value.Adopt reactance modulation system, modulation rate can reach 2.5Gbps, needs to store Wavelength Assignment information and special wavelength control device in this system, and the current overall context cost is higher.
3. wideband light source is cut apart spectrum.Cut apart by using narrow band filter that broadband spectral is carried out frequency spectrum, produce the narrow band light of the specific wavelength of each passage needs, and carry upward signal with this.Broadband light can be produced by several different methods, as Light-Emitting Diode (Light Emission Diode, LED), super luminescence diode (Super-Luminescent Diode, SLD), erbium-doped fiber amplifier (Erbium-Doped FiberAmplifier, the EDFA) amplified spont-aneous emission of Chan Shenging (Amplified Spontaneous Emission, ASE) or the super continuum light source that produces by nonlinear effect of ultrashort pulse (Super-continuum LightSource, SLS) etc.This scheme cost is lower, but major defect is frequency spectrum to be cut apart and cause optical power loss to strengthen, and causes the power budget anxiety.In addition, the Mode Partition Noise that wideband light source is intrinsic, intensity noise and beat frequency noise have limited modulation rate and the highest number of users, and the high modulation speed of frequency spectrum splitting scheme is less than 1Gbps.
4. the FP laser of wideband light source+injection locking.The FP laser is output as many longitudinal modes when normal operation, and after the exterior light of appropriate power and wavelength is injected, can realize single longitudinal mode output.The operation principle of the FP laser of injection locking just is being based on this characteristic.This scheme is used array waveguide grating usually, and (Arrayed Waveguide Grating AWG) carries out frequency spectrum to wideband light source and cuts apart, and is injected among the FP-LD as seed light then.Compare with wideband light source split spectrum scheme, the utilance of this scheme light source is higher, and under gain saturation mechanism, the intensity noise of being cut apart the surplus of generation by frequency spectrum will be suppressed.This scheme needs higher relatively injecting power, and directly modulation rate can reach 2.5Gbps.
Wideband light source+reflective semiconductor optical amplifier (Reflective SemiconductorOptical Amplifier, RSOA).Similar with the 4th kind of scheme, wideband light source by the AWG split spectrum, is injected RSOA with the arrowband seed light then, utilize RSOA to finish loading and amplification to upward signal.In addition, also can utilize the gain saturation characteristic of RSOA: the RSOA of user's side wipes earlier the downstream signal that injects, and amplifies then and pass through modulation to load upward signal, realizes the uplink and downlink signals common light source, be called the remodulates technology, this technology can further reduce system configuration.System transmissions speed based on RSOA generally can reach 2.5Gbps at present, but the RSOA cost is higher, causes this scheme cost higher.
In the such scheme, except the Distributed Feedback Laser scheme, other schemes all can realize colorless ONU.The tunable laser scheme is said so from principle can realize colorless ONU, but cost is too high, and operator does not consider to use the scheme of ONU arbitrary source basically at present.System from commercial has all adopted wideband light source to add the scheme of FP-LD or RSOA.
Figure of description 1 is typical WDM-PON system configuration schematic diagram, and is identical with other EPONs, still is made up of optical line terminal, distant-end node, optical network unit and Transmission Fibers.Optical line terminal is positioned at switching center, comprises one group of light Transmit-Receive Unit RX and TX, AWG type Wavelength division multiplexer/demultiplexer AWG1 and required wideband light source BLS1 and the BLS2 of up-downgoing transmission, and BLS1 and BLS2 are respectively as work light and standby power source.Optical wavelength-division multiplex/demodulation multiplexer generally comprises two kinds of film filter and array waveguide gratings, main effect is that a plurality of wavelength signals are multiplexed in the optical fiber, be transferred to distant-end node (RemoteNode then, RN), the Wavelength division multiplexer/demultiplexer AWG2 of recycling distant-end node is routed to the light signal of a plurality of wavelength respectively among each optical network unit ONU 1～ONUN according to wavelength, and offers user's use by light Transmit-Receive Unit RX and TX wherein.But, in the general WDM-PON system, C-band and L-band are used in the up-downgoing transmission respectively, need be sidelong at OLT and put two wideband light sources, C-band and L-band broadband light are provided respectively, so all need to use two wideband light sources in each WDM-PON system, the cost costliness, and Access Network is responsive especially to cost, is unfavorable for the large-scale application of WDM-PON system.
Summary of the invention
Thereby technical problem to be solved by this invention is to solve in the WDM-PON system to need to use two wideband light sources to cause the problem of cost costliness.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides the device of the shared wideband light source of a kind of a plurality of WDM-PON systems, this device comprises work, standby wideband light source, first optical branching device, the APS unit, some Optical Amplifier Units, the one 1 * 2 fiber coupler and routing unit, described work, standby wideband light source are used for producing respectively wave-length coverage and cover the broadband light that the uplink and downlink transmission of WDM-PON system needs; Described first optical branching device is used for above-mentioned broadband light demultiplexing output; Described APS unit is arranged between work, standby wideband light source and first optical branching device, is used for the APS between realization work and the standby wideband light source; Described some Optical Amplifier Units are respectively applied to amplify the broadband light through the output of first optical branching device; Described the one 1 * 2 fiber coupler is used for the broadband light of first optical branching device output is divided into the uplink and downlink broadband light by wave band; Described routing unit is used for and will loads downstream signal from the downstream broadband light of 1 * 2 fiber coupler, first port output, and the up broadband light of second port output loads upward signal.
In the said apparatus, described routing unit comprises first, second circulator and second, the 31 * 2 fiber coupler, from the downstream broadband light of first port of the one 1 * 2 fiber coupler output through first port input of first circulator and export first port of the 21 * 2 fiber coupler to from second port, again from the output of the public port of this coupler and transfer to OLT and load the public port that returns the 21 * 2 fiber coupler behind the downstream signal, and exporting second port of first circulator to by first port of this coupler, first port that exports the 31 * 2 fiber coupler through the 3rd port of this circulator to is gone forward side by side into the trunk fibre circuit from the public port output of this fiber coupler again; From the up broadband light of second port of the one 1 * 2 fiber coupler output through first port input of second circulator and export second port of the 31 * 2 fiber coupler to from second port, go forward side by side into trunk optical fiber from the public port output of this fiber coupler again, after transferring to ONU loading upward signal, fibre circuit returns trunk optical fiber, after transmission, enter the public port of the 31 * 2 fiber coupler, exported to second port of second circulator then by second port of this fiber coupler, export second port of the 21 * 2 fiber coupler to by the 3rd port of second circulator again and by the public port output of this fiber coupler, import at last in the receiver of OLT side.
Described routing unit comprises first, second circulator and second, the 31 * 2 fiber coupler, import first port of the 21 * 2 fiber coupler from the downstream broadband light of first port of the one 1 * 2 fiber coupler output, export first port of first circulator to and export OLT to from second port of this first circulator from the public port of this coupler afterwards and load first port that returns second port of first circulator again behind the downstream signal and export the 31 * 2 fiber coupler from the 3rd port to, export first port of second circulator again to from the public port of this coupler, second port by second circulator exports the trunk optical fiber circuit at last; Import second port of the 31 * 2 fiber coupler from the up broadband light of second port of the one 1 * 2 fiber coupler output, export first port of second circulator to and from second port output of this circulator from the public port of this coupler afterwards, after the trunk optical fiber transmission, enter ONU, load second port that returns second port of second circulator behind the upward signal and export the 21 * 2 fiber coupler from the 3rd port to, export first port of first circulator again to from the public port of this coupler, second port by this circulator exports in the receiver of OLT side at last.
Described APS unit comprises optical switch, second optical branching device and photo-detector; work, standby wideband light source output to first, second two inputs of optical switch respectively; the output of optical switch connects second optical branching device; the two-way output of second optical branching device connects first optical branching device and photo-detector respectively; the luminous power that photo-detector will be imported light compares in real time with default optical power threshold, and at this luminous power switches light switch during less than threshold value.
The present invention also provides the method for the shared wideband light source of a kind of a plurality of WDM-PON systems, may further comprise the steps:
The broadband light demultiplexing output that A10, first optical branching device will be worked or standby two wideband light sources produce;
A20, Optical Amplifier Unit will export 1 * 2 fiber coupler to after the broadband light of optical branching device output is amplified;
A30, load the downstream signal output of OLT from the downstream broadband light of 1 * 2 fiber coupler, first port output, the upward signal that the up broadband light of second port output loads ONU returns OLT.
In the said method, also comprise the APS step, when the Output optical power of work light automatically switches to standby power source during less than preset threshold value.
steps A 30 is specially from the downstream broadband light of the first port output of the one 1 * 2 fiber coupler and inputs and from the second port, export to the first port of the 21 * 2 fiber coupler through the first port of the first circulator, export OLT to from the public port of this coupler again and load after downstream signal the second port that returns to the public port of the 21 * 2 fiber coupler and exported to the first circulator by the first port of this coupler, the first port that exports the 31 * 2 fiber coupler through the 3rd port of this circulator to exports fibre circuit to from the public port of this fiber coupler again, input and from the second port, export to the second port of the 31 * 2 fiber coupler through the first port of the second circulator from the up broadband light that the second port of the one 1 * 2 fiber coupler is exported, again from the output of the public port of this fiber coupler through fibre circuit to returning to the public port of the 31 * 2 fiber coupler after ONU loads upward signal and being exported to the second port of the second circulator by the second port of this fiber coupler, export the second port of the 21 * 2 fiber coupler to and by the public port of this fiber coupler, exported in the receiver of OLT side by the 3rd port of the second circulator finally.
Steps A 30 is specially first port that enters the 21 * 2 fiber coupler from the downstream broadband light of first port output of the one 1 * 2 fiber coupler, export first port of first circulator to and export OLT to from second port of this first circulator from public port and load first port that returns second port of first circulator again behind the downstream signal and export the 31 * 2 fiber coupler from the 3rd port to, export first port of second circulator again to from the public port of this coupler, second port by second circulator exports fibre circuit at last; Enter second port of the 31 * 2 fiber coupler from the up broadband light of second port of the one 1 * 2 fiber coupler output, export first port of second circulator to and export trunk optical fiber to from second port of this circulator from public port, enter ONU through transmission and load upward signal, return second port of second circulator afterwards and export second port of the 21 * 2 fiber coupler from the 3rd port to, export first port of first circulator again to from the public port of this coupler, second port by this circulator exports in the receiver of OLT side at last.
The present invention; the routing unit of forming by three 1 * 2 fiber couplers and two circulators has been realized sharing wideband light source in a plurality of WDM-PON system; and possesses the auto switching protection of wideband light source; improved system reliability; reduced system cost, be very suitable for being applied in the WDM-PON system of commercialization.
Description of drawings
Fig. 1 is typical WDM-PON system configuration schematic diagram;
Fig. 2 is the schematic diagram that the wideband light source device is shared by a plurality of WDM-PON of the present invention system;
Fig. 3 is that the wideband light source device first embodiment schematic diagram is shared by a plurality of WDM-PON of the present invention system;
Fig. 4 is that the wideband light source device second embodiment schematic diagram is shared by a plurality of WDM-PON of the present invention system.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
Of the present invention in the WDM-PON system, for the cycle characteristics that utilizes array waveguide grating (AWG) is realized the single fiber bi-directional transmission, the uplink and downlink wavelength that same ONU uses generally be separated by an integer Free Spectral Range (Free Spectrum Range, FSR).Below use λ u to represent the wave band that uplink communication uses, λ d represents the wave band that downlink communication uses.
Fig. 2 is the schematic diagram that the wideband light source device is shared by a plurality of WDM-PON of the present invention system; as shown in Figure 2; this device comprises wideband light source group BLS; APS unit AP S; first optical branching device, 1 * NSplitter; some Optical Amplifier Unit OA, several the one 1 * 2 fiber couplers SplitterB1 ..., SplitterBN and several routing units Route Unit1 ..., Route UnitN.Wideband light source group BLS produces the wideband light source that uplink and downlink communication needs, comprise work and standby two wideband light sources, emission wavelength ranges all covers λ d and λ u, and above-mentioned broadband light exports a plurality of WDM-PON system to by first optical branching device, 1 * N splitter demultiplexing; APS unit AP S is arranged between wideband light source group BLS and first optical branching device, the 1 * N splitter, is used for the APS between realization work and the standby wideband light source; Some Optical Amplifier Unit OA are respectively applied to amplify the broadband light through first optical branching device, 1 * Nsplitter output; The one 1 * 2 fiber coupler SplitterB1 ..., SplitterB is respectively applied to the broadband light of first optical branching device, 1 * Nsplitter output is divided into the uplink and downlink broadband light by wave band; Each routing unit Route Unit1 ... or Route UnitN, being used for and will loading downstream signal from the downstream broadband light of corresponding 1 * 2 fiber coupler, first port output, the up broadband light of second port output loads upward signal.
Fig. 3 is the shared wideband light source device first embodiment schematic diagrames of a plurality of WDM-PON systems; present embodiment comprises the wideband light source group; the APS unit; the first optical branching device splitter1; some Optical Amplifier Unit OA; several the one 1 * 2 fiber couplers WC1 and several routing units; the wideband light source group is made up of BLS1 and two wideband light sources of BLS2; wherein BLS1 is as the work wideband light source; BLS2 is as standby wideband light source; the APS unit comprises optical switch OS; second optical branching device and photo-detector PD; BLS1 and BLS2 output to first of optical switch OS respectively; the second two inputs; the output of optical switch OS connects the second optical branching device splitter2; beam splitter Splitter2 with broadband light according to power by cutting apart separated into two parts at 1: 99; wherein sub-fraction enters photo-detector PD; the luminous power that detection receives; and will this real-time luminous power with the normal condition of storage in advance under optical power threshold compare; when the luminous power that receives is lower than threshold value; show that work light BLS1 breaks down; to control optical switch immediately switches; the output broadband light of standby wideband light source BLS2 is inserted light path; the assurance business is quick-recovery soon, has realized protection in 1: 1 of wideband light source.This device resume speed depends primarily on the response time of photoelectric device, generally can reach in a few tens of milliseconds at present.Splitter1 is divided into the N equal portions with the broadband light that wave-length coverage covers λ d and λ u according to power, thereby provides broadband light for N WDM-PON system.Image intensifer unit OA, the broadband light after power cut apart is carried out power amplification, with the power budget requirement of the up-downgoing transmission of satisfying each WDM-PON network.
Routing unit comprises first, the second circulator C1, C2 and second, the 31 * 2 fiber coupler WC2, WC3, from the downstream broadband light λ d of first port one 1 output of the one 1 * 2 fiber coupler WC1 through first port, 41 inputs of the first circulator C1 and export first port 21 of the 21 * 2 fiber coupler WC2 to from second port 42, export from the public port 20 of this coupler WC2 again, after transmitting, arrive optical line terminal OLT, be routed to corresponding port after being cut apart by AWG type Wavelength division multiplexer/demultiplexer frequency spectrum, be injected in the Optical Transmit Unit of OLT as seed light then, load downlink optical signal by modulation, then return the public port 20 of the 21 * 2 fiber coupler WC2 by Wavelength division multiplexer/demultiplexer again and exported to second port 42 of the first circulator C1 by first port 21 of this coupler WC2, first port 31 that exports the 31 * 2 fiber coupler WC3 through the 3rd port 43 of this circulator C1 to exports fibre circuit to from the public port 30 of this fiber coupler WC3 again, be routed in the corresponding ONU receiver through Optical Distribution Network, finish the transmission of downstream signal.Be shown in dotted line the transmission path of downstream broadband light λ d and downstream signal among Fig. 3.
For up broadband light λ u, import and export to from second port 52 second port 32 of the 31 * 2 fiber coupler WC3 by first port 51 of the second circulator C2 from second port one, 2 outputs of the one 1 * 2 fiber coupler WC1, public port 30 from this fiber coupler WC3 enters the trunk optical fiber link again, be routed in the corresponding optical network unit by optical distribution network then, be injected in the Optical Transmit Unit as seed light, after modulation loads uplink optical signal, return the public port 30 of the 31 * 2 fiber coupler WC3 by optical distribution network again and exported to second port 52 of the second circulator C2 by second port 32 of this fiber coupler WC3, last the 3rd port 53 by the second circulator C2 exports second port 22 of the 21 * 2 fiber coupler WC2 to and is exported by the public port 20 of this fiber coupler WC2, Wavelength division multiplexer/demultiplexer by the OLT side is routed in the corresponding receiver, finishes the transmission of upward signal.Double dot dash line shows the transmission path of up broadband light and upward signal among Fig. 3.
Fig. 4 is that the wideband light source device second embodiment schematic diagram is shared by a plurality of WDM-PON of the present invention system, as shown in Figure 4, the different routing units that are of present embodiment and embodiment one, described routing unit comprises first, the second circulator C1, C2 and second, the 31 * 2 fiber coupler WC2, WC3, enter first port 21 of the 21 * 2 fiber coupler WC2 from the downstream broadband light λ d of first port one 1 output of the one 1 * 2 fiber coupler WC1, after public port 20 exports first port 41 of the first circulator C1 to and exports OLT to load downstream signal from second port 42 of this first circulator C1 again from second port 42 that returns the first circulator C1 and first port 31 that exports the 31 * 2 fiber coupler WC3 from the 3rd port 43 to, export first port 51 of the second circulator C2 again to from the public port 30 of this coupler WC3, second port 52 by the second circulator C2 exports fibre circuit at last; Enter second port 32 of the 31 * 2 fiber coupler WC3 from the up broadband light λ u of second port one 2 output of the one 1 * 2 fiber coupler WC1, export first port 51 of the second circulator C2 to and export trunk optical fiber to from second port 52 of this circulator C2 through public port 30, after transmission, enter ONU, load second port 22 that returns second port 52 of the second circulator C2 behind the upward signal and export the 21 * 2 fiber coupler WC2 from the 3rd port 53 to, export first port 41 of the first circulator C1 again to from the public port 20 of this coupler WC2, second port 42 by this circulator C1 exports in the receiver of OLT side at last.
The present invention also provides the method for the shared wideband light source of a kind of a plurality of WDM-PON systems, may further comprise the steps:
The broadband light demultiplexing output that A10, first optical branching device will be worked or standby two wideband light sources produce;
A20, Optical Amplifier Unit will export 1 * 2 fiber coupler to after the broadband light of optical branching device output is amplified;
A30, load the downstream signal output of OLT from the downstream broadband light of 1 * 2 fiber coupler, first port output, the upward signal that the up broadband light of second port output loads ONU returns OLT, the function of routing unit among its method such as embodiment one or the embodiment two.
In addition, this method also comprises the APS step, when the Output optical power of work light automatically switches to standby power source during less than preset threshold value.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (4)
1. the device of wideband light sources is shared by many WDM-PON systems, comprising:
Work, standby wideband light source are used for producing respectively wave-length coverage and cover the broadband light that the uplink and downlink transmission of WDM-PON system needs;
First optical branching device is used for above-mentioned broadband light demultiplexing output;
The APS unit is arranged between work, standby wideband light source and first optical branching device, is used for the APS between realization work and the standby wideband light source;
Some Optical Amplifier Units are respectively applied to amplify the broadband light through the output of first optical branching device;
It is characterized in that also comprising:
The one 1 * 2 fiber coupler is used for the broadband light of first optical branching device output is divided into the uplink and downlink broadband light by wave band;
Routing unit, be used for will be from the downstream broadband optical routing of 1 * 2 fiber coupler, first port output to OLT to load downstream signal, the up broadband light of second port output is routed among the ONU to load upward signal;
Described routing unit comprises first, second circulator and second, the 31 * 2 fiber coupler, import first port of the 21 * 2 fiber coupler from the downstream broadband light of first port of the one 1 * 2 fiber coupler output, export first port of first circulator to and export OLT to from second port of this first circulator from the public port of this coupler afterwards and load first port that returns second port of first circulator again behind the downstream signal and export the 31 * 2 fiber coupler from the 3rd port to, export first port of second circulator again to from the public port of this coupler, second port by second circulator exports the trunk optical fiber circuit at last; Import second port of the 31 * 2 fiber coupler from the up broadband light of second port of the one 1 * 2 fiber coupler output, export first port of second circulator to and from second port output of this circulator from the public port of this coupler afterwards, after the trunk optical fiber transmission, enter ONU, load second port that returns second port of second circulator behind the upward signal and export the 21 * 2 fiber coupler from the 3rd port to, export first port of first circulator again to from the public port of this coupler, second port by this circulator exports in the receiver of OLT side at last.
2. the device of wideband light source is shared by a plurality of WDM-PON as claimed in claim 1 systems; it is characterized in that described APS unit comprises optical switch, second optical branching device and photo-detector; work, standby wideband light source output to first, second two inputs of optical switch respectively; the output of optical switch connects second optical branching device; the two-way output of second optical branching device connects first optical branching device and photo-detector respectively; the luminous power that photo-detector will be imported light compares in real time with default optical power threshold, and at this luminous power switches light switch during less than threshold value.
3. the method for wideband light sources is shared by many WDM-PON systems, may further comprise the steps:
The broadband light demultiplexing output that A10, first optical branching device will be worked and standby two wideband light sources produce;
A20, Optical Amplifier Unit will export 1 * 2 fiber coupler to after the broadband light of optical branching device output is amplified;
A30, load the downstream signal output of OLT from the downstream broadband light of 1 * 2 fiber coupler, first port output, the upward signal that the up broadband light of second port output loads ONU returns OLT;
Steps A 30 is specially:
Enter first port of the 21 * 2 fiber coupler from the downstream broadband light of first port of the one 1 * 2 fiber coupler output, export first port of first circulator to and export OLT to from second port of this first circulator from public port and load first port that returns second port of first circulator again behind the downstream signal and export the 31 * 2 fiber coupler from the 3rd port to, export first port of second circulator again to from the public port of this coupler, second port by second circulator exports fibre circuit at last; Enter second port of the 31 * 2 fiber coupler from the up broadband light of second port of the one 1 * 2 fiber coupler output, export first port of second circulator to and export trunk optical fiber to from second port of this circulator from public port, enter ONU through transmission and load upward signal, return second port of second circulator afterwards and export second port of the 21 * 2 fiber coupler from the 3rd port to, export first port of first circulator again to from the public port of this coupler, second port by this circulator exports in the receiver of OLT side at last.
4. the method for wideband light source is shared by a plurality of WDM-PON as claimed in claim 3 systems, it is characterized in that also comprising the APS step, when the Output optical power of work light automatically switches to standby power source during less than preset threshold value.
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| CN101841746B (en) * | 2010-04-14 | 2013-07-10 | 东南大学 | Wavelength division multiplexing passive optical network optical line terminal having shared protection function |
| CN101895463B (en) * | 2010-04-20 | 2012-08-15 | 上海大学 | System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network) |
| CN102131129A (en) * | 2010-04-28 | 2011-07-20 | 华为技术有限公司 | Method, device and system for receiving uplink signal in passive optical network (PON) |
| CN106953686A (en) * | 2017-02-24 | 2017-07-14 | 东华大学 | A kind of hot backup system based on data flow multiplexing optical transmitter and image intensifer |
| CN106817323B (en) * | 2017-03-06 | 2023-08-22 | 南京曦光信息科技有限公司 | Physical layer multicast optical switching node device capable of being integrated on chip and network |
| CN111431602B (en) * | 2019-01-10 | 2021-08-06 | 中国移动通信有限公司研究院 | Forward transmission network system and light source generation method thereof |
| CN112511229B (en) * | 2019-09-16 | 2022-08-30 | 中国移动通信有限公司研究院 | Forward transmission network system and optical module |
| CN114172580B (en) * | 2021-12-22 | 2023-07-25 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing network WDM-PON system based on adjustable ONU and signal propagation method |
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| CN1983906A (en) * | 2005-12-22 | 2007-06-20 | 华为技术有限公司 | Passive light network for wave duplexing and its realization |
| CN101141346A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Wavelength division multiplexing passive optical network device |
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| CN1983906A (en) * | 2005-12-22 | 2007-06-20 | 华为技术有限公司 | Passive light network for wave duplexing and its realization |
| CN101141346A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Wavelength division multiplexing passive optical network device |
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