CN102098106A - Optical line terminal for wavelength division multiplexing-time division multiplexing passive optical network - Google Patents
Optical line terminal for wavelength division multiplexing-time division multiplexing passive optical network Download PDFInfo
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- CN102098106A CN102098106A CN2011100436290A CN201110043629A CN102098106A CN 102098106 A CN102098106 A CN 102098106A CN 2011100436290 A CN2011100436290 A CN 2011100436290A CN 201110043629 A CN201110043629 A CN 201110043629A CN 102098106 A CN102098106 A CN 102098106A
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Abstract
The invention relates to an optical line terminal for a wavelength division multiplexing-time division multiplexing passive optical network. The optical line terminal comprises an optical sub-assembly, a continuous mode transmitter control circuit, a burst mode receiver control circuit, and a micro control unit, wherein the continuous mode transmitter control circuit is connected with the optical sub-assembly, and controls the light-emitting state of the optical sub-assembly; the burst mode receiver control circuit is connected with the optical sub-assembly to provide a working voltage for the optical sub-assembly, and receives an electrical signal of the optical sub-assembly; and both the continuous mode transmitter control circuit and the burst mode receiver control circuit are connected with the micro control unit, and are controlled and monitored by the micro control unit. The optical line terminal has the continuous mode transmitter control circuit for transmitting the optical signal and the burst mode receiver control circuit for processing the burst uplink optical signal, and is applied to a wavelength division multiplexing-time division multiplexing (WDM-TDM) passive optical network. Compared with the method for improving the bandwidth bottleneck by adopting the WDM simply, the optical line terminal for the wavelength division multiplexing-time division multiplexing passive optical network has lower cost.
Description
[technical field]
The present invention relates to passive optical-fiber network, especially relate to the optical line terminal of a kind of wavelength division multiplexing-time division multiplexing passive optical-fiber network.
[background technology]
Passive optical network technique is widely accepted as this fact of one preferred technique of Optical Access Network.At present, the main way of realization of passive optical network technique is a time division multiplexing mode, instant division multiplexing passive optical network network (TDM PON).
The up employing time division multiplexing of TDM PON, each optical network unit (ONU) of user side is uploaded light signal at assigned timeslot, does not disturb mutually each other.The descending employing broadcast type of TDM-PON, each ONU can only be discerned the message segment of respective identifier in the continuous light signal that passes under the optical line terminal (OLT).
In TDM-PON, the most widely used is EPON and two kinds of technology of GPON.EPON adopts the speed of up-downgoing symmetry 1.25G/s to transmit, and GPON adopts up 1.25G/s, and descending 2.5G/s speed is transmitted, and for two kinds of technological means, terminal use's bandwidth is all shared.Along with the reasons such as quantity growth of demand data amount and home-use HDTV (High-Definition Television) day by day, the bandwidth of sharing descending 2.5G/s has been difficult to satisfy present requirement.For satisfying the demand of this big data quantity, two kinds of technical schemes have been proposed gradually in the passive optical network technique field: 10G EPON and Wave division multiplexing passive optical network (WDM PON).
WDM PON adopts wavelength-division multiplex technique, and each terminal all can be enjoyed independent bandwidth, no longer is shared.Because WDM PON technology and TDM PON technology can realize fiber optic network and share, and only need local side and terminal node place to use array waveguide grating (Arrayed Waveguide Grating, light multiplex/demultiplex Passive Optical Components such as AWG), therefore aspect technology upgrading, can realize smooth upgrade substantially, need not the enforcement of infrastructure project.But WDM PON technology but exists certain cost pressure, is mainly derived from optical assembly.
[summary of the invention]
Based on this, be necessary to provide the optical line terminal of a kind of wavelength division multiplexing cheaply-time division multiplexing passive optical-fiber network.
The optical line terminal of a kind of wavelength division multiplexing-time division multiplexing passive optical-fiber network, comprise optical assembly, continuous mode transmitter control circuit, burst-mode receiver control circuit and micro-control unit, described continuous mode transmitter control circuit is connected and controls the luminance of optical assembly with optical assembly; Described burst-mode receiver control circuit and optical assembly are connected to optical assembly provides operating voltage, and receives the signal of telecommunication of optical assembly; Described continuous mode transmitter control circuit all is connected with described micro-control unit with the burst-mode receiver control circuit, is subjected to the control and the monitoring of micro-control unit.
Preferably, described optical assembly adopts two fine transmitting-receiving structures, comprise that refrigeration mode distributed feed-back formula emission optical assembly and burst mode receive optical assembly, described refrigeration mode distributed feed-back formula emission optical assembly comprises distributed feed-back formula laser and refrigeration module, and described burst mode receives optical assembly and comprises avalanche diode and trans-impedance amplifier; Described distributed feed-back formula laser is connected with continuous mode transmitter control circuit, be subjected to continuous mode transmitter control circuit control emission light signal, described refrigeration module is connected with continuous mode transmitter control circuit, controls refrigeration module work by continuous mode transmitter control circuit according to the working temperature of setting; Described burst mode receives optical assembly and is connected with the burst-mode receiver control circuit, by the burst-mode receiver control circuit light signal that burst mode receives the optical assembly reception is handled.
Preferably, described continuous mode transmitter control circuit comprises laser driver and temperature-control circuit: described laser driver is connected with micro-control unit with distributed feed-back formula laser, for distributed feed-back formula laser provides drive current and monitors the also size of controlling and driving electric current by micro-control unit; Described temperature-control circuit is connected with micro-control unit with refrigeration module, the operating state of control refrigeration module and the working point that refrigeration module is set by micro-control unit.
Preferably, described burst-mode receiver control circuit comprises burst mode receiver, limiting amplifier, signal deteching circuit, burst received optical power observation circuit and avalanche diode booster circuit: described burst mode receiver receives optical assembly with burst mode and is connected, and is used to recover the signal of telecommunication that described burst mode receives optical assembly output; Described limiting amplifier is connected with burst mode receiver, and the described signal of telecommunication is amplified and exports; Described signal deteching circuit is connected with limiting amplifier, is used to detect and export the state of burst luminous signal; Described avalanche diode booster circuit is connected with micro-control unit with avalanche diode, for avalanche diode provides normal working voltage, and by the output voltage level of micro-control unit controls avalanche diode booster circuit; Described burst received optical power observation circuit is connected with micro-control unit with the avalanche diode booster circuit, and sampling keeps the avalanche diode photoelectric current, and sends the size of the luminous power of burst reception to micro-control unit.
Preferably, described optical assembly adopts single fiber transmitting-receiving structure, comprise refrigeration mode distributed feed-back formula emission tube core, burst mode receives tube core and wavelength division multiplexer, described refrigeration mode distributed feed-back formula emission optical assembly comprises distributed feed-back formula laser and refrigeration module, described burst mode receives optical assembly and comprises avalanche diode and trans-impedance amplifier: described distributed feed-back formula laser is connected with continuous mode transmitter control circuit, be subjected to continuous mode transmitter control circuit control emission light signal, described refrigeration module is connected with continuous mode transmitter control circuit, controls refrigeration module work by continuous mode transmitter control circuit according to the working temperature of setting; Described trans-impedance amplifier is connected with the burst-mode receiver control circuit, by the burst-mode receiver control circuit signal of telecommunication of trans-impedance amplifier output is handled; Described wavelength division multiplexer reflexes to the light signal that receives the photosurface of avalanche diode with the complete transmission output of light signal that distributed feed-back formula laser sends.
Preferably, described continuous mode transmitter control circuit comprises laser driver and temperature-control circuit: described laser driver is connected with micro-control unit with distributed feed-back formula laser, for distributed feed-back formula laser provides drive current and monitors the also size of controlling and driving electric current by micro-control unit; Described temperature-control circuit is connected with micro-control unit with refrigeration module, the operating state of control refrigeration module and the working point that refrigeration module is set by micro-control unit.
Preferably, described burst-mode receiver control circuit comprises burst mode receiver, limiting amplifier, signal deteching circuit, burst received optical power observation circuit and avalanche diode booster circuit: described burst mode receiver and burst mode receive tube core and are connected, are used to recover the signal of telecommunication that the trans-impedance amplifier of described optical assembly is exported; Described limiting amplifier is connected with burst mode receiver, and the described signal of telecommunication is amplified and exports; Described signal deteching circuit is connected with limiting amplifier, is used to detect and export the state of burst luminous signal; Described avalanche diode booster circuit is connected with micro-control unit with described avalanche diode, for avalanche diode provides normal working voltage, and by the output voltage level of micro-control unit controls avalanche diode booster circuit; Described burst received optical power observation circuit is connected with micro-control unit with the avalanche diode booster circuit, and sampling keeps the avalanche diode photoelectric current, and sends the size of the luminous power of burst reception to micro-control unit.
Above-mentioned optical line terminal has the continuous mode transmitter control circuit of emission light signal and has the burst-mode receiver control circuit of handling the burst uplink optical signal, it is applied to the passive optical network of WDM carrying TDM, with respect to utilizing WDM to improve the mode of bandwidth bottleneck merely, has lower cost.
[description of drawings]
Fig. 1 is the systematic schematic diagram of WDM-TDM EPON;
Fig. 2 is the module map of optical line terminal of wavelength division multiplexing-time division multiplexing passive optical-fiber network of an embodiment;
Fig. 3 is the optical line terminal structure chart of a preferred embodiment;
Fig. 4 is the optical line terminal structure chart of an alternate embodiment.
[embodiment]
As shown in Figure 1, be the systematic schematic diagram of WDM-TDM EPON.The WDM-TDM passive optical network comprise local side in the system optical line terminal (Optical Line Terminal, OLT) and the optical network unit of user side (Optical Network Unit, ONU), between OLT and the ONU by Fu Yong ﹠amp; The demultiplexing device communicates to connect.This system is the implementation of a kind of WDM carrying TDM, also is the applied system of OLT of present embodiment.Each WDM-TDM PON OLT optical module is descending in the system takies a wavelength channel, carries out the broadcast type transmission; Multichannel WDM-TDM PON ONU optical module happens suddenly up through occupying a wavelength channel after the time division multiplexing.Use with demultiplexing node place in recovery and all to use condensation wave to divide optical passive component, as array waveguide grating (Arrayed Waveguide Grating, AWG), high density Wave division multiplexing technology (Dense Wave Length Division Multiplexing, DWDM) passive optical module etc.
As shown in Figure 2, be the module map of optical line terminal of wavelength division multiplexing-time division multiplexing passive optical-fiber network of an embodiment.This optical line terminal comprises optical assembly (OSA) 100, continuous mode transmitter control circuit (Continuous Mode Transmitter Control Circuit) 200, burst-mode receiver control circuit (Burst Mode Receiver Control Circuit) 300 and micro-control unit (Micro Control Unit, MCU) 400.
Continuous mode transmitter control circuit 200 and optical assembly 100 are connected and control the luminance of optical assembly 100.Continuous mode transmitter control circuit 200 constantly produces light signal in a continuous manner, sends to Fu Yong ﹠amp; The demultiplexing device.The luminance of optical assembly 100 comprises the centre wavelength of luminous power, extinction ratio and light wave etc.
Burst-mode receiver control circuit 300 is connected with optical assembly 100, for optical assembly 100 provides operating voltage, and the signal of telecommunication of reception optical assembly 100.Burst-mode receiver control circuit 300 is used to receive and handle the light signal of optical assembly 100 burst transfer.
Continuous mode transmitter control circuit 200 all is connected with micro-control unit 400 with burst-mode receiver control circuit 300, is subjected to the control and the monitoring of micro-control unit 400.
Based on WDM carrying TDM wavelength division multiplexing downlink broadcast, the up mode of operation of time division multiplexing burst, the optical line terminal of present embodiment has the continuous mode transmitter control circuit 200 of emission light signal and has the burst-mode receiver control circuit 300 of handling the burst uplink optical signal, therefore can be used for this WDM-TDM PON.
As shown in Figure 3, in a preferred embodiment, optical assembly 100 adopts two fine transmitting-receiving structures.Optical assembly 100 comprises that (Cooled Distribute Feedback, DFB) emission optical assembly 110 and burst mode receive optical assembly 120 to refrigeration mode distributed feed-back formula.Refrigeration mode distributed feed-back formula emission optical assembly 110 comprises distributed feed-back formula laser and refrigeration module, and burst mode receives optical assembly 120 and comprises avalanche diode and trans-impedance amplifier.
The distributed feed-back formula laser of refrigeration mode distributed feed-back formula emission optical assembly 110 is connected with continuous mode transmitter control circuit 200, be subjected to continuous mode transmitter control circuit control 200 emission light signals, refrigeration module is connected with continuous mode transmitter control circuit 200, is freezed according to the working temperature control refrigeration module of setting by continuous mode transmitter control circuit 200.
Particularly, continuous mode transmitter control circuit 200 comprises laser driver 210 and temperature-control circuit 220.Wherein laser driver 210 is connected with micro-control unit 400 with refrigeration mode distributed feed-back formula emission optical assembly 110, and the distributed feed-back formula laser of launching optical assembly 110 for the distributed feed-back formula provides drive current and monitors the also size of controlling and driving electric current by micro-control unit 400.Temperature-control circuit 220 is connected with micro-control unit with refrigeration module, the operating state of control refrigeration module and the working point that refrigeration module is set by micro-control unit 400.
Burst mode receives optical assembly 120 and is connected with burst-mode receiver control circuit 300, and the light signal that is received optical assembly 120 receptions by 300 pairs of burst modes of burst-mode receiver control circuit is handled.
Particularly, burst-mode receiver control circuit 300 comprises burst mode receiver 310, limiting amplifier 320, signal deteching circuit 330, burst received optical power observation circuit 340 and avalanche diode booster circuit 350.Wherein burst mode receiver 310 is connected with the burst mode optical fiber receive module 120 of optical assembly 100, is used to recover the signal of telecommunication of the trans-impedance amplifier output of optical assembly 100.Limiting amplifier 320 is connected with burst mode receiver 310, and the described signal of telecommunication is amplified and exports.Signal deteching circuit 330 is connected with limiting amplifier 320, is used to detect and export the state of burst luminous signal.Avalanche diode booster circuit 350 is connected with micro-control unit with described avalanche diode, for avalanche diode provides normal working voltage, and by the output voltage level of micro-control unit controls avalanche diode booster circuit.The received optical power observation circuit 340 that happens suddenly is connected with micro-control unit 400 with avalanche diode booster circuit 350, and sampling keeps the avalanche diode photoelectric current, and sends the size of the luminous power of burst reception to micro-control unit 400.
The operation principle of this optical line terminal below is described:
As shown in Figure 4, be the optical line terminal of another alternate embodiment.In the present embodiment, optical assembly 100 adopts single fiber transmitting-receiving structure, itself and the foregoing description difference are: adopt refrigeration mode distributed feed-back formula emission tube core (TO-CAN) emission light signal, adopt burst mode to receive the tube core receiving optical signals, refrigeration mode distributed feed-back formula emission tube core receives tube core with burst mode and all is connected with WDM, and the light signal of up-downgoing all carries out multiplexing and demultiplexing by WDM.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. the optical line terminal of wavelength division multiplexing-time division multiplexing passive optical-fiber network is characterized in that, comprises optical assembly, continuous mode transmitter control circuit, burst-mode receiver control circuit and micro-control unit,
Described continuous mode transmitter control circuit is connected and controls the luminance of optical assembly with optical assembly;
Described burst-mode receiver control circuit and optical assembly are connected to optical assembly provides operating voltage, and receives the signal of telecommunication of optical assembly;
Described continuous mode transmitter control circuit all is connected with described micro-control unit with the burst-mode receiver control circuit, is subjected to the control and the monitoring of micro-control unit.
2. the optical line terminal of wavelength division multiplexing as claimed in claim 1-time division multiplexing passive optical-fiber network, it is characterized in that, described optical assembly adopts two fine transmitting-receiving structures, comprise that refrigeration mode distributed feed-back formula emission optical assembly and burst mode receive optical assembly, described refrigeration mode distributed feed-back formula emission optical assembly comprises distributed feed-back formula laser and refrigeration module, and described burst mode receives optical assembly and comprises avalanche diode and trans-impedance amplifier;
Described distributed feed-back formula laser is connected with continuous mode transmitter control circuit, be subjected to continuous mode transmitter control circuit control emission light signal, described refrigeration module is connected with continuous mode transmitter control circuit, controls refrigeration module work by continuous mode transmitter control circuit according to the working temperature of setting;
Described burst mode receives optical assembly and is connected with the burst-mode receiver control circuit, by the burst-mode receiver control circuit light signal that burst mode receives the optical assembly reception is handled.
3. the optical line terminal of wavelength division multiplexing as claimed in claim 2-time division multiplexing passive optical-fiber network is characterized in that, described continuous mode transmitter control circuit comprises laser driver and temperature-control circuit:
Described laser driver is connected with micro-control unit with distributed feed-back formula laser, for distributed feed-back formula laser provides drive current and monitors the also size of controlling and driving electric current by micro-control unit;
Described temperature-control circuit is connected with micro-control unit with refrigeration module, the operating state of control refrigeration module and the working point that refrigeration module is set by micro-control unit.
4. the optical line terminal of wavelength division multiplexing as claimed in claim 2-time division multiplexing passive optical-fiber network, it is characterized in that described burst-mode receiver control circuit comprises burst mode receiver, limiting amplifier, signal deteching circuit, burst received optical power observation circuit and avalanche diode booster circuit:
Described burst mode receiver receives optical assembly with burst mode and is connected, and is used to recover the signal of telecommunication that described burst mode receives optical assembly output;
Described limiting amplifier is connected with burst mode receiver, and the described signal of telecommunication is amplified and exports;
Described signal deteching circuit is connected with limiting amplifier, is used to detect and export the state of burst luminous signal;
Described avalanche diode booster circuit is connected with micro-control unit with avalanche diode, for avalanche diode provides normal working voltage, and by the output voltage level of micro-control unit controls avalanche diode booster circuit;
Described burst received optical power observation circuit is connected with micro-control unit with the avalanche diode booster circuit, and sampling keeps the avalanche diode photoelectric current, and sends the size of the luminous power of burst reception to micro-control unit.
5. the optical line terminal of wavelength division multiplexing as claimed in claim 1-time division multiplexing passive optical-fiber network, it is characterized in that, described optical assembly adopts single fiber transmitting-receiving structure, comprise that refrigeration mode distributed feed-back formula emission tube core, burst mode receive tube core and wavelength division multiplexer, described refrigeration mode distributed feed-back formula emission optical assembly comprises distributed feed-back formula laser and refrigeration module, and described burst mode receives optical assembly and comprises avalanche diode and trans-impedance amplifier:
Described distributed feed-back formula laser is connected with continuous mode transmitter control circuit, be subjected to continuous mode transmitter control circuit control emission light signal, described refrigeration module is connected with continuous mode transmitter control circuit, controls refrigeration module work by continuous mode transmitter control circuit according to the working temperature of setting;
Described trans-impedance amplifier is connected with the burst-mode receiver control circuit, by the burst-mode receiver control circuit signal of telecommunication of trans-impedance amplifier output is handled;
Described wavelength division multiplexer reflexes to the light signal that receives the photosurface of avalanche diode with the complete transmission output of light signal that distributed feed-back formula laser sends.
6. the optical line terminal of wavelength division multiplexing as claimed in claim 5-time division multiplexing passive optical-fiber network is characterized in that, described continuous mode transmitter control circuit comprises laser driver and temperature-control circuit:
Described laser driver is connected with micro-control unit with distributed feed-back formula laser, for distributed feed-back formula laser provides drive current and monitors the also size of controlling and driving electric current by micro-control unit;
Described temperature-control circuit is connected with micro-control unit with refrigeration module, the operating state of control refrigeration module and the working point that refrigeration module is set by micro-control unit.
7. the optical line terminal of wavelength division multiplexing as claimed in claim 5-time division multiplexing passive optical-fiber network, it is characterized in that described burst-mode receiver control circuit comprises burst mode receiver, limiting amplifier, signal deteching circuit, burst received optical power observation circuit and avalanche diode booster circuit:
Described burst mode receiver and burst mode receive tube core and are connected, are used to recover the signal of telecommunication that the trans-impedance amplifier of described optical assembly is exported;
Described limiting amplifier is connected with burst mode receiver, and the described signal of telecommunication is amplified and exports;
Described signal deteching circuit is connected with limiting amplifier, is used to detect and export the state of burst luminous signal;
Described avalanche diode booster circuit is connected with micro-control unit with described avalanche diode, for avalanche diode provides normal working voltage, and by the output voltage level of micro-control unit controls avalanche diode booster circuit;
Described burst received optical power observation circuit is connected with micro-control unit with the avalanche diode booster circuit, and sampling keeps the avalanche diode photoelectric current, and sends the size of the luminous power of burst reception to micro-control unit.
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| CN201110043629.0A CN102098106B (en) | 2011-02-22 | 2011-02-22 | Optical line terminal for wavelength division multiplexing-time division multiplexing passive optical network |
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| CN201110043629.0A CN102098106B (en) | 2011-02-22 | 2011-02-22 | Optical line terminal for wavelength division multiplexing-time division multiplexing passive optical network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523540A (en) * | 2011-12-31 | 2012-06-27 | 青岛海信宽带多媒体技术有限公司 | Optical module and passive optical network with same |
| CN102761795A (en) * | 2012-07-10 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and optical filling system and module |
| WO2016000119A1 (en) * | 2014-06-30 | 2016-01-07 | 索尔思光电（成都）有限公司 | Laser burst control circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729154A (en) * | 2008-11-03 | 2010-06-09 | 华为技术有限公司 | Method, device and system for realizing LR-PON |
| CN101959086A (en) * | 2009-07-15 | 2011-01-26 | 中兴通讯股份有限公司 | Time division multiplex and wavelength division multiplex coexisting passive optical network system and transmission method |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729154A (en) * | 2008-11-03 | 2010-06-09 | 华为技术有限公司 | Method, device and system for realizing LR-PON |
| CN101959086A (en) * | 2009-07-15 | 2011-01-26 | 中兴通讯股份有限公司 | Time division multiplex and wavelength division multiplex coexisting passive optical network system and transmission method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523540A (en) * | 2011-12-31 | 2012-06-27 | 青岛海信宽带多媒体技术有限公司 | Optical module and passive optical network with same |
| CN102523540B (en) * | 2011-12-31 | 2015-03-25 | 青岛海信宽带多媒体技术有限公司 | Optical module and passive optical network with same |
| CN102761795A (en) * | 2012-07-10 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and optical filling system and module |
| WO2016000119A1 (en) * | 2014-06-30 | 2016-01-07 | 索尔思光电（成都）有限公司 | Laser burst control circuit and method |
| US9325421B1 (en) | 2014-06-30 | 2016-04-26 | Source Photonics (Chengdu) Co., Ltd. | Burst-mode laser control circuit and the method thereof |
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