CN101888269B - Method for stabilizing wavelength of optical transmitter in WDM-TDMA (Wavelength Division Multiplex-Time Division Multiple Address) mixed PON (Passive Optical Network) system in burst mode - Google Patents
Method for stabilizing wavelength of optical transmitter in WDM-TDMA (Wavelength Division Multiplex-Time Division Multiple Address) mixed PON (Passive Optical Network) system in burst mode Download PDFInfo
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- CN101888269B CN101888269B CN201010146751.6A CN201010146751A CN101888269B CN 101888269 B CN101888269 B CN 101888269B CN 201010146751 A CN201010146751 A CN 201010146751A CN 101888269 B CN101888269 B CN 101888269B
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Abstract
The invention discloses an optical transmitter in a WDM-TDMA (Wavelength Division Multiplex-Time Division Multiple Address) mixed PON (Passive Optical Network) system and a method for stabilizing wavelength in a burst mode. The method comprises the following steps of: triggering two paths of analog-digital converters by using burst control signals to obtain the current optical signals of detection adjustable lasers of a first optical detector and a second optical detector in a wavelength locker; obtaining the wavelength value offsets of the optical signals at the moment according to the output optical power of the current optical signals; and adjusting the wavelength adjustable laser in the optical transmitter according to the offsets to stabilize the wavelength on the set wavelength value. In the invention, the wavelength adjustable laser is controlled to work in the burst mode by the burst control signals, the current optical signals of the detection adjustable lasers of the first optical detector and the second optical detectors in the wavelength locker are simultaneously obtained so that the wavelength value offsets of the current optical signals are accurately obtained for further adjusting the adjustable lasers, thereby the ONU optical transmitter in the WDM-TDMA mixed PON system can stably work in the burst transmission mode.
Description
Technical field
The present invention relates to WDM-TDMA mixing PON system, be specifically related to the method for optical transmitter wavelength stabilization under burst mode in WDM-TDMA mixing PON system.
Background technology
As shown in Figure 1, it is mainly made up of several parts such as local side optical line terminal (OLT), user side optical network unit (ONU) and Optical Distribution Networks (ODN) at present common GPON and EPON system frame structure.In the upper TDMA technology (access of Time Division MultipleAccess time division multiple access) that adopts of up direction (ONU to OLT direction), so we generally classify as TDMA-PON GPON and EPON.The major advantage of TDMA-PON is, the optical transmitter of all ONU is all operated in Same Wavelength, and adopts identical optical device, and OLT also only needs an optical receiver.But, in TDMA-PON, the light signal that multiple ONU send may be on the generation time territory, optical receiver place of OLT collision, thereby cause OLT to receive wrong uplink optical signal, for fear of this collision, each ONU in TDMA-PON system must be at the inner uplink optical signal that sends of the send window of oneself (time slot), one has continuous light signal, there is no again a light signal for a moment so will show on its light transmission interface.
WDM-TDMA hybrid passive optical network is the advantage that combines ripe WDM technology and TDMA-PON technology, adds an emerging technology that sends cheaply the adjustable laser technique of wavelength and occur, its network architecture as shown in Figure 2.The maximum advantage of WDM-TDMA hybrid passive optical network system is to carry carry on a traditional trunk optical fiber on road TDMA-PON system upgrade to trunk optical fiber of multichannel TDMA-PON system, each TDMA-PON system takies a wavelength channel, multiple TDMA-PON systems take multiple wavelength channels, multiple wavelength channels close ripple and partial wave is completed by Heatless AWG (AAWG).A typical WDM-TDMA hybrid passive optical network system structure comprises the parts such as optical line terminal (OLT:Optical Line Termination), Optical Distribution Network (ODN:Optical DistributionNetwork) and optical network unit (ONU), and wherein ODN comprises Heatless AWG (AAWG:AthermalArrayed Waveguide Grating) and optical branching device (Splitter) and circuit optical fiber.
In WDM-TDMA hybrid passive optical network system, light source on OLT and ONU can be realized by laser with fixed wavelength, but being system, the subject matter of WDM-TDMA hybrid passive optical network system in practical engineering, needs to prepare the OLT optical module of different wave length and the ONU optical module of different wave length, not only need a large amount of specific wavelength inventories, and need multi-wavelength's optical module for subsequent use, be difficult for carrying out the maintenance of OLT and ONU optical module, so in order to reduce the maintenance cost of manufacturer's inventory cost and operator, improve the wavelength configuration flexibility of network, all to the optical source wavelength of OLT in WDM-TDMA system and ONU optical module be configured to adjustable, be that usually said optical module is colourless.From Fig. 2, be not difficult to find out because Access Network is very responsive to economy, thereby the implementation method research of OLT, ONU in WDM-TDMA is had great significance.Therefore people wish by realizing someway OLT in WDM-TDMA hybrid passive optical network system, ONU optical module is colourless is that optical source wavelength is adjustable, so just can reduce inventory cost and the maintenance cost of equipment manufacturers, the O&M complexity that reduces operator, improves the wavelength configuration flexibility in practical engineering.
The key issue that optical source wavelength tunable laser will solve is how to realize wavelengthtunable stable.Do not configure the adjustable wavelength laser of Wavelength stabilized device, the variations in temperature of its tube core can cause the long variation of variation and chamber of tube core refractive index, thereby causes the variation of wavelength.And in the time of laser tube core temperature constant, laser works long hours, the aging drift that also can cause laser wavelength of tube core, so adjustable wavelength laser must be guaranteed long the stablizing of institute's harmonic.The general wavelength locker that adopts keeps the stable of wavelength at present, uses the principle of wavelength locker control laser wavelength as shown in Figure 3.The output voltage of wavelength locker changes with the variation of laser wavelength of transmitted light, this change in voltage information can be used to directly or indirectly control the optical wavelength of laser transmitting, and (for relying on temperature adjusting wavelength laser, this change in voltage information is used for adjusting the temperature of laser through suitably processing; For the tunable laser that relies on voltage-regulation wavelength, this change in voltage information is used for directly adjusting the wavelength of laser), make on its wavelength that is stabilized in requirement.Can be divided into following two kinds according to the principle of wavelength locker:
(1) wavelength locker of employing deielectric-coating filter plate:
Fig. 4 adopts the wavelength of the wavelength locker of deielectric-coating filter plate to detect schematic diagram, input light is sent into the first cut-off filter after collimating lens, and (the first cut-off filter is selectable, different filters can make centre wavelength be operated on the slope of plus or minus), then pass through band pass filter, transmitted light enters the first photo-detector PD1, reverberation enters the second detector PD2, and the signal of telecommunication of response is through formula
computing, the result obtaining changes the variation with wavelength shift, and this result feedback, to wavelengthtunable laser, makes its stable output wavelength.
(2) wavelength locker of Fabry-Perot etalon:
Fig. 5 is the schematic diagram of this wavelength locker, input light is first through an optical splitter, a part is sent into the first photo-detector PD1, another part is sent into the second photo-detector PD2 after Etalon etalon, the signal that PD1 produces is as with reference to signal, and the signal that PD2 produces is to change with the variation of optical signal frequency.The keyed end (Lockpoint) that the intersection point of the response curve of PD1 and PD2 is a certain laser wavelength as can be seen from Figure 6.
After analyzing the operation principle of conventional wavelength locker, be not difficult to find, as long as can accurately measure the optical power value detecting on first, second photo-detector PD1 and PD2, can be according to corresponding formula
calculate out result parameter, then go out the now side-play amount of wavelength value according to this coaptation, finally again the wavelength of laser is adjusted according to this side-play amount, and finally obtain the light transmitted signal that wavelength value is accurate and stable.As shown in Figure 6, PD1=-4dB, PD2 OdB and-8dB change, α is also thereupon between [1,1].In the time of α=0, wavelength value is locked; When
time, frequency values will reduce, and wavelength value should increase; When
time, frequency values will increase, and wavelength value should reduce.This measures with the process of calculation and will in the course of work of optical transmitter, repeatedly carry out again and again, to guarantee the long-term stability of wavelength value.
But, the current optical transmitter with wavelength locking function is to be all operated under continuous signal sending mode, and in WDM-TDMA hybrid passive optical network system, the light signal sending due to the multiple ONU under same TDMA-PON system may be on the generation time territory, optical receiver place of OLT collision, thereby cause OLT to receive wrong uplink optical signal, so require each ONU must be at the inner uplink optical signal that sends of the send window of oneself (time slot), now the optical transmitter of each ONU is operated under burst transmission mode, so the light signal sending from ONU optical transmitter there will be the phenomenon cutting in and out, if now still adopt the working method of wavelength locker under continuous signal sending mode by extremely unstable the optical power value that causes measuring on detector PD1 and PD2, its numerical value cannot be served as the reference frame of wavelength locker, and finally make optical transmitter cannot guarantee the stable of light transmitted signal wavelength value.
Summary of the invention
Technical problem to be solved by this invention is the stable problem that in solution WDM-TDMA hybrid passive optical network system, optical transmitter cannot be guaranteed light transmitted signal wavelength value.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide the method for optical transmitter wavelength stabilization under burst mode in a kind of WDM-TDMA mixing PON system, trigger the current light signal of first, second photo-detector detection tunable laser in two-way analog to digital converter acquisition wavelength locker with burst control signal, and obtaining the now wavelength value side-play amount of light signal according to the Output optical power of current light signal, the adjustable wavelength laser in optical transmitter makes in the Wavelength stabilized wavelength value setting according to this side-play amount adjustment.
In such scheme, wavelength locker is the wavelength locker of Fabry-Perot etalon, obtain the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to formula (PD2-PD1)/PD1, in formula, PD1 is the Output optical power of the first photo-detector, and PD2 is the Output optical power of the second photo-detector.
The present invention also provides a kind of optical transmitter, for WDM-TDMA mixing PON system, this optical transmitter comprises adjustable wavelength laser, wavelength locker, two-way analog to digital converter, burst control signal generator and master controller, in described wavelength locker, be provided with first, the second photo-detector, in described master controller, be provided with comparator, the burst control signal controlling adjustable wavelength laser that described burst control signal generator sends is operated in burst mode, simultaneously this burst control signal trigger respectively with wavelength locker in first, the analog to digital converter that the second photo-detector is connected, and by this two-way analog to digital converter respectively by first, the optical signal power value that the second photo-detector detects is converted to two ways of digital signals, described comparator obtains the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to described two ways of digital signals, tunable laser is adjusted the wavelength of its output optical signal according to this wavelength value side-play amount.
In above-mentioned optical transmitter, described wavelength locker is the wavelength locker that adopts Fabry-Perot etalon, the light signal that adjustable wavelength laser sends is after optical splitter, and a part is sent into the first photo-detector, and another part is sent into the second photo-detector after Etalon etalon.
Described comparator obtains the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to formula (PD2-PD1)/PD1, and in formula, PD1 is the Output optical power of the first photo-detector, and PD2 is the Output optical power of the second photo-detector.
The present invention, be operated in burst mode with burst control signal controlling adjustable wavelength laser, this burst control signal triggers the analog to digital converter work being connected with first, second photo-detector in wavelength locker respectively simultaneously, obtain the current light signal of first, second photo-detector detection tunable laser in wavelength locker, thereby obtain exactly the wavelength value side-play amount of current light signal, and then tunable laser is regulated, ONU optical transmitter in WDM-TDMA hybrid passive optical network system can stably be worked under burst transmission mode.
Accompanying drawing explanation
Fig. 1 is existing TDMA-PON reference configuration figure;
Fig. 2 is WDM-TDMA hybrid passive optical network system reference configuration figure;
Fig. 3 is existing wavelength locking control principle drawing;
Fig. 4 is deielectric-coating filter plate wavelength locker schematic diagram;
Fig. 5 is the wavelength locker schematic diagram of Fabry-Perot etalon;
Fig. 6 is Etalon explorer response curve chart;
Fig. 7 is light transmitted signal wavelength locking theory diagram under burst transmission mode in WDM-TDMA hybrid passive optical network system.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Fig. 7 is the schematic diagram that works in wavelength locking under burst transmission mode in WDM-TDMA hybrid passive optical network.Wavelength locker is the wavelength locker that adopts Fabry-Perot etalon, in wavelength locker, be provided with first, second two photo-detector PD1 and PD2, can find out in conjunction with Fig. 5, the light signal that adjustable wavelength laser LD sends enters wavelength locker by Input Fiber, after optical splitter Spliter, a part is sent into the first photo-detector PD1 and is produced with reference to output signal Reference Out, and another part is sent into the second photo-detector PD2 and produced Etalon Out signal after Etalon etalon.The Output optical power of this two paths of signals is converted to respectively two ways of digital signals through two-way analog to digital converter ADC, and the relative difference between two voltage signals changes along with the variation of laser wavelength of transmitted light.
Burst control signal Tx_burst is existing on ONU optical transmitter in current all TDMA-PON systems, it is luminous or not luminous that this signal is used for controlling ONU optical transmitter, produced by burst control signal generator, adjustable wavelength laser LD is operated under burst transmission mode.In the time that optical transmitter is operated in burst mode, the light signal detecting on first, second photo-detector PD1 and PD2 will cut in and out, and the magnitude of voltage of corresponding its sensed light signal power is also one to have for a moment and do not have.Now introduce burst control signal Tx_burst measures this optical signal power value that cuts in and out trigger signal source as optical transmitter.When each optical transmitter starts burst type transmission light signal, convert the voltage signal amount of the reflected optical signal watt level of first, second photo-detector PD1 and PD2 output to digital signal according to Tx_burst signal fast by two-way analog/digital signal conversion device (ADC), then gather this two ways of digital signals by master controller (Controller), then by the comparator in master controller (Controller) according to predefined algorithm
calculate the side-play amount of wavelength, last basis calculates the side-play amount of wavelength and the light transmission wavelength of adjustable wavelength laser (LD) is adjusted by master controller again, after repeatedly such loop control flow process, finally make in the Wavelength stabilized wavelength value setting of light transmitted signal, and in the course of work subsequently, constantly repeating such locking process, to realize the long-term stability of operation wavelength.
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, within all falling into protection scope of the present invention.
Claims (2)
- In 1.WDM-TDMA mixing PON system, the method for optical transmitter wavelength stabilization under burst mode, is characterized in that,Burst control signal Tx_burst with ONU optical transmitter triggers two-way analog to digital converter, convert the voltage signal amount of the reflected optical signal watt level of first, second photo-detector output in wavelength locker to digital signal, and calculate and obtain the now wavelength value side-play amount of light signal according to described digital signal, the adjustable wavelength laser in optical transmitter makes in the Wavelength stabilized wavelength value setting according to this side-play amount adjustment;Described wavelength locker is the wavelength locker that adopts Fabry-Perot etalon, obtain the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to formula (PD2-PD1)/PD1, in formula, PD1 is the Output optical power of the first photo-detector, and PD2 is the Output optical power of the second photo-detector;The light signal that adjustable wavelength laser sends is after optical splitter, a part is sent into the first photo-detector, another part is sent into the second photo-detector after Etalon etalon, and the Output optical power of two paths of signals is converted to respectively two ways of digital signals through two-way analog to digital converter.
- 2. optical transmitter, for the ONU of WDM-TDMA mixing PON system, this ONU optical transmitter comprises adjustable wavelength laser, wavelength locker, two-way analog to digital converter, burst control signal generator and master controller, in described wavelength locker, be provided with first, the second photo-detector, in described master controller, be provided with comparator, it is characterized in that the burst control signal Tx_burst control adjustable wavelength laser that described burst control signal generator sends is operated in burst mode, simultaneously this burst control signal trigger respectively with wavelength locker in first, the analog to digital converter that the second photo-detector is connected, and by this two-way analog to digital converter respectively by first, the optical signal power value that the second photo-detector detects is converted to two ways of digital signals, described comparator obtains the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to described two ways of digital signals, tunable laser is adjusted the wavelength of its output optical signal according to this wavelength value side-play amount,Described wavelength locker is the wavelength locker that adopts Fabry-Perot etalon, and the light signal that adjustable wavelength laser sends is after optical splitter, and a part is sent into the first photo-detector, and another part is sent into the second photo-detector after Etalon etalon;Described comparator obtains the wavelength value side-play amount for adjusting described adjustable wavelength laser output according to formula (PD2-PD1)/PD1, and in formula, PD1 is the Output optical power of the first photo-detector, and PD2 is the Output optical power of the second photo-detector.
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| CN201010146751.6A CN101888269B (en) | 2010-04-15 | 2010-04-15 | Method for stabilizing wavelength of optical transmitter in WDM-TDMA (Wavelength Division Multiplex-Time Division Multiple Address) mixed PON (Passive Optical Network) system in burst mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI497928B (en) * | 2013-09-17 | 2015-08-21 | Univ Nat Chiao Tung | Passive optical network system |
| CN103916179B (en) * | 2014-03-28 | 2016-09-07 | 武汉光迅科技股份有限公司 | Method by local side optical line terminal monitoring user side tunable laser wavelength |
| CN103986525A (en) * | 2014-06-03 | 2014-08-13 | 武汉光迅科技股份有限公司 | Receiving and transmitting module of optical access unit |
| JP6974427B2 (en) * | 2016-07-21 | 2021-12-01 | 華為技術有限公司Huawei Technologies Co., Ltd. | Wavelength shift control method and system |
| WO2018103004A1 (en) * | 2016-12-07 | 2018-06-14 | 华为技术有限公司 | Wavelength locking method and laser |
| CN110945802B (en) * | 2017-07-29 | 2023-01-20 | 光速株式会社 | Optical transmitter operating in burst mode and method for controlling optical transmitter operating in burst mode |
| CN111092690A (en) * | 2019-12-27 | 2020-05-01 | 京信通信系统（中国）有限公司 | WDM-based baseband signal transmission device, method, storage medium and electronic device |
| CN114567380B (en) * | 2020-11-27 | 2024-05-14 | 华为技术有限公司 | Wavelength control device and method, optical line terminal, optical network terminal and system |
| CN114698009A (en) * | 2020-12-28 | 2022-07-01 | 上海诺基亚贝尔股份有限公司 | Apparatus, method, device and medium for wavelength shift measurement |
| CN116916199B (en) * | 2023-09-12 | 2023-12-05 | 武汉长光科技有限公司 | Wavelength locking method and device of multi-wavelength access system ONU |
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| EP1291988A1 (en) * | 2001-09-10 | 2003-03-12 | Intune Technologies Limited | Frequency locking of multi-section laser diodes |
| CN101369713B (en) * | 2008-09-16 | 2011-07-13 | 中兴通讯股份有限公司 | Control device for implementing optical module wavelength locking and method thereof |
| CN101510802A (en) * | 2008-12-16 | 2009-08-19 | 成都优博创技术有限公司 | Circuit for measuring outburst mode optical signal power |
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| WO2010018913A1 (en) * | 2008-08-13 | 2010-02-18 | Electronics And Telecommunications Research Institute | Burst-mode optical signal receiver |
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