CN104426610B - Optical line terminal and optical network unit - Google Patents
Optical line terminal and optical network unit Download PDFInfo
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- CN104426610B CN104426610B CN201310396493.0A CN201310396493A CN104426610B CN 104426610 B CN104426610 B CN 104426610B CN 201310396493 A CN201310396493 A CN 201310396493A CN 104426610 B CN104426610 B CN 104426610B
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Abstract
The invention provides a kind of optical line terminal and optical network unit.The optical line terminal includes:Wavelength-division multiplex element, for being multiplexed and demultiplexing uplink optical signal and downlink optical signal;Coarse wavelength division demultiplexer, for filtering and demultiplexing uplink optical signal;Photo-coupler, for first via uplink optical signal and the second road uplink optical signal will to be divided into through filtering and demultiplexed uplink optical signal;Uplink multi-path receiver, for receiving first via uplink optical signal;Descending multichannel transmitter, it sends downlink optical signal via array waveguide grating and wavelength-division multiplex element;And wavelength shift monitoring unit, for detecting whether the wavelength of the second road uplink optical signal crosses the border boundary threshold, when the wavelength for detecting the second road uplink optical signal crosses the border boundary threshold, it is determined that needing to adjust the optical network unit of upstream wavelength, and configured information is included into the downlink optical signal of descending multichannel transmitter.
Description
Technical field
The present invention relates to time-division Wave division multiplexing passive optical network, more particularly, to time-division Wave division multiplexing passive optical network
Optical line terminal and optical network unit, and a kind of method for detection of crossing the border further to wavelength, and a kind of coarse adjustment
The method of the wavelength of uplink optical signal.
Background technology
Time-division Wave division multiplexing passive optical network (Time and Wavelength Division Multiplexed-
Passive Optical Network, TWDM-PON) major programme for NG-PON2 is thought of as by industry.It is not only applicable
In 40GbMs capacity, and the growth requirement suitable for following optical-fiber network is also contemplated as, for example, is suitable for capacity
The optical-fiber network of more than 100Gbit/s capacity.
Recently, wavelength plan and wavelength interval are FSAN (Full Service Access Network, Full-Services access
Network) two focus subjects under discussion.Tunable laser and laser array are two kinds of choosings of the light transmitter of optical network unit side
Select.Tunable laser with high stability be preferably as it occupies less wave band, thus its can limitation ripple
More wavelength are supported in the case of section.However, the cost of tunable laser is higher, and its related temperature control system limit
Make its application in TWDM-PON.Traditional user can not undertake the cost of tunable laser.In order to overcome the problem, need
A kind of inexpensive upstream wavelength stabilization technique is researched and developed for tunable laser or laser array.
In order to realize that upstream wavelength is stable, there is the scheme of two kinds of wavelength calibrations at present:Carried out in optical network unit side up
Wavelength calibration and optical line terminal side carry out upstream wavelength calibration.Upstream wavelength calibration is carried out in optical network unit side, is not required to
Wavelength information is delivered to optical line terminal.It can use traditional based on semiconductor thermoelectric refrigeration device
The cold and hot bidirectional tuning device of (Thermoelectric Cooler, TEC) adds light net as laser wavelength stable element
The wave length shift of laser, can be limited in the range of ± 5GHz, thus in regulation by the local feedback circuit control of network unit
Wave band in can support more wavelength.However, the cost of this kind of tunable laser is higher, therefore, can with inexpensive
Adjusting laser becomes preferred scheme, for example with the tunable Distributed Feedback Laser of heat.Although but it can use relatively low cost
Meet it and change wavelength in TWDM-PON up wave band.But the acquirement of wavelength information but needs optical network unit local
TEMP, and the wavelength that TEMP is reflected also has certain error sometimes.The generation of these problems is due in light
NE, which locally carries out wavelength calibration, can increase more cost, and the wavelength stability control technology of low cost is in TWDM-PON
Middle relative absence.Therefore, upstream wavelength calibration is carried out in optical line terminal side and provides a kind of inexpensive wavelength stability of development
The thinking of control technology.It can be each optical network unit progress upstream wavelength school using the equipment of optical line terminal side
Standard, and optical network unit side only includes the executive component of tuning wavelength：The heater and bi-directional wavelength of unidirectional wavelength tuning are adjusted
Humorous TEC.Optical line terminal is detected after optical network unit wave length shift information, and optical network unit is notified by related news,
Thus upstream wavelength regulation is carried out.
Now the problem of, is, for laser array, and multiple gratings are placed on chip, therefore for the laser of output
Device will appear from the resident wavelength (residential wavelength) of some offset criteria wavelength.The problem of resident wavelength, can be with
Alleviated by the reinforcement of manufacturing process, but this problem still have impact on TWDM-PON uplink communication in recent years.
On the other hand, for tunable laser, tunable laser or wavelength control therein are all very expensive, and uncontrolled
Wavelength will all be influenceed by wavelength shift.Influenceed by the skew of foozle and temperature, the laser in optical network unit
Device array or tunable laser can all have problems with:1. the crosstalk between adjacent wavelength channel.2. it is up at optical line terminal
The reception processing of optical signal.For example, the accurate thin wave filter in optical line terminal, such as array waveguide grating (Arrayed
Waveguide Grating, AWG) so that the uplink optical signal for receiving the wavelength with skew is extremely difficult.
In a word, how the light transmitter in optical network unit is used as using laser array or inexpensive tunable laser
It is still a problem, it is especially desirable to which simple regulation controlling mechanism is set in optical network unit.
At present, accurate temperature control mechanism is applied in optical network unit.However, cost is in optical network unit
Key factor.Preferably, it is desirable to uncontrolled laser is applied in optical network unit.Current coarse wavelength division demultiplexer is not
It disclosure satisfy that the wave band requirement in TWDM-PON.Current coarse wavelength division demultiplexer is used without temperature controlled laser.Due to
The wave band that it is assigned with about 10nm for a passage, the wave band of the 20nm in C-band only can support TWDM-PON's upper
Two capable wavelength channels.Accordingly, it would be desirable to continue to research and develop the thick temprature control method in TWDM-PON, and there is provided a kind of cost
Relatively low solution.
The content of the invention
In order to solve the above-mentioned technical problem, according to the first aspect of the invention, it is a kind of to be used for time-division Wavelength division multiplexing-passive light
The optical line terminal of network, wherein, N number of mutually different upstream wavelength is applied in the time-division Wave division multiplexing passive optical network
With N number of mutually different downstream wavelength, the optical line terminal is connected via optical splitter with least one optical network unit, described
Optical line terminal includes:Wavelength-division multiplex element, for being multiplexed and demultiplexing uplink optical signal and downlink optical signal;Thick wavelength-division is demultiplexed
With device, it is coupled with the wavelength-division multiplex element, for filtering and demultiplexing the uplink optical signal;Photo-coupler, for inciting somebody to action
It is divided into first via uplink optical signal and the second road uplink optical signal through filtering and demultiplexed uplink optical signal, wherein described the
The power of uplink optical signal is more than the power of second road uplink optical signal all the way;Uplink multi-path receiver, for receiving
State first via uplink optical signal;Descending multichannel transmitter, it sends institute via array waveguide grating and the wavelength-division multiplex element
State downlink optical signal;And wavelength shift monitoring unit, for detecting whether the wavelength of second road uplink optical signal crosses the border
Boundary threshold, when the wavelength for detecting second road uplink optical signal crosses the border boundary threshold, it is determined that needing to adjust on described
The optical network unit of traveling wave length, and configured information is included into the downlink optical signal of the descending multichannel transmitter, wherein institute
State configured information and indicate that identified optical network unit needs the wavelength of its uplink optical signal of coarse adjustment.
According to the second aspect of the invention, it is proposed that a kind of optical-fiber network list for time-division Wave division multiplexing passive optical network
Member, wherein, N number of mutually different upstream wavelength is applied in the time-division Wave division multiplexing passive optical network and N number of different
Downstream wavelength, optical line terminal is connected via optical splitter with the optical network unit, and the optical network unit includes:Wavelength-division is answered
With element, for being multiplexed and demultiplexing uplink optical signal and downlink optical signal;Tunable receiver, for passing through the wavelength-division multiplex
Element receives the downlink optical signal, and the downlink optical signal includes configured information, and the configured information indicates the optical-fiber network
Unit needs the wavelength of its uplink optical signal of coarse adjustment;Emitter, for sending described up by the wavelength-division multiplex element
Optical signal;And thermoregulator, it adjusts temperature grade emitter described in coarse adjustment according to the configured information and sent
The uplink optical signal wavelength, wherein the temperature grade correspond to thick regulation step-length.
By the preferred embodiment of the invention, by setting temperature adjustment in optical network unit, and it is whole in optical link
Boundary filter is set in end, a kind of thick wavelength control schemes are realized.Pass through the program, it is not necessary to again in optical network unit
Implement being accurately controlled or accurate wavelength regulation for high cost, so as to significantly reduce the cost of each optical network unit.
And the application of the present invention is larger, and (such as it is tunable laser and laser battle array to go for emitter in optical network unit
The situation of row).In addition, transboundary testing mechanism also causes uplink communication more to stablize to the wavelength in optical line terminal, and in fact
Now get up more convenient.Additionally, it is also to carry out in real time according to the solution of the present invention, so as to further increase accuracy.
Various aspects of the invention will be become apparent from by the explanation of embodiment in detail below.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention is other
Feature, objects and advantages will become more apparent:
Fig. 1 shows the optical-fiber network framework of the TWDM-PON according to one embodiment of the present of invention;
Fig. 2 shows the detailed embodiment party of the wavelength shift monitoring unit in Fig. 1 according to one embodiment of the present of invention
Formula;
Fig. 3 shows the detailed implementation of the wavelength shift monitoring unit in Fig. 1 according to an alternative embodiment of the invention
Mode;
Fig. 4 shows the corresponding relation according to the temperature grade of one embodiment of the present of invention and the regulation step-length of wavelength;
And
Fig. 5 shows the spectrogram according to one embodiment of the present of invention.
In figure, through different diagrams, same or similar reference represents identical or corresponding part or spy
Levy.
Embodiment
Fig. 1 shows the optical-fiber network framework of the TWDM-PON according to one embodiment of the present of invention.As shown in figure 1, light
Road terminal is connected via optical splitter with multiple optical network unit 1...n, wherein the structure of optical network unit 1 is shown in detail, its
The structure of his optical network unit is similar with the structure of optical network unit 1.
4 mutually different upstream wavelengths and 4 mutually different downstream wavelengths are applied in this TWDM-PON.At it
In his example, the upstream wavelength and downstream wavelength of other numbers can also be applied.
According to the present invention optical line terminal include wavelength-division multiplex element, its be used to be multiplexed and demultiplex uplink optical signal and
Downlink optical signal.In the optical line terminal, coarse wavelength division demultiplexer is coupled with wavelength-division multiplex element, for filtering and demultiplexing
Uplink optical signal.As illustrated, coarse wavelength division demultiplexer outputs uplink optical signal of 4 tunnels through filtering and demultiplexing.At one
In embodiment, coarse wavelength division demultiplexer can be filter plate.
As shown in figure 1, photo-coupler is coupled with coarse wavelength division demultiplexer, it is used for through filtering and demultiplexed up
Optical signal is divided into first via uplink optical signal and the second road uplink optical signal, and wherein the power of first via uplink optical signal is more than the
The power of two road uplink optical signals.
In one embodiment of the invention, the power of first via uplink optical signal accounts for the 95% of the power of uplink optical signal,
The power of second road uplink optical signal accounts for the 5% of the power of uplink optical signal.Alternatively, the power of first via uplink optical signal is accounted for
The 90% of the power of uplink optical signal, the power of the second road uplink optical signal accounts for the 10% of the power of uplink optical signal.
Uplink multi-path receiver in optical line terminal receives first via uplink optical signal from photo-coupler.And wavelength shift
Monitoring unit then receives the second road uplink optical signal from photo-coupler.
Here, referring to Fig. 2 and Fig. 3, which respectively show the two of wavelength shift monitoring unit kind embodiment.
As shown in Fig. 2 wavelength shift monitoring unit includes power amplifier, boundary filter, photodetector and electricity
Subprocessing module.Wherein, power amplifier is used for the power for amplifying the second road uplink optical signal from photo-coupler, that is, passes through
The power per uplink optical signal all the way of demultiplexing.In the embodiment of fig. 2, the quantity of boundary filter is upstream wavelength
2 times of quantity.In the case of 4 upstream wavelengths of application, Fig. 2 embodiment have 8 boundary filters (lL, lR, 2L, 2R,
3L, 3R, 4L and 4R).Each boundary filter has boundary threshold, and is located at the wavelength that 4 upstream wavelengths are allowed respectively
The upper side and lower side of passage, namely coarse wavelength division demultiplexer the passage allowed short wavelength and long wave strong point.These borders
Wave filter is used to filter the second amplified road uplink optical signal.Here, the side of boundary filter can be tuned by temperature
Boundary's threshold value ensures the accuracy of boundary threshold, and can also be used for increasing or reduce the bandwidth of allowed wavelength channel.
Photodetector in wavelength shift monitoring unit is used to detect whether the wavelength of the second road uplink optical signal crosses the border
Boundary threshold.For example, when filtering out the second road uplink optical signal in boundary filter, now photodetector will detect work(
Rate, so as to judge that the wavelength of the second road uplink optical signal crosses the border boundary threshold.If on the contrary, is not filtered out in boundary filter
Two road uplink optical signals, now photodetector will can't detect power, so as to judge the wavelength of the second road uplink optical signal
Do not cross the border boundary threshold.
When the wavelength for detecting the second road uplink optical signal crosses the border boundary threshold, the electronics in wavelength shift monitoring unit
Processing module will be determined to need the optical network unit of regulation upstream wavelength, and configured information is included into the descending multichannel into Fig. 1
In the downlink optical signal of transmitter.Here, configured information indicates that identified optical network unit needs its up light letter of coarse adjustment
Number wavelength.Preferably, configured information, which also includes identified optical network unit, needs the uplink optical signal of its transmission of coarse adjustment
Wavelength regulation step-length.
For example, when photodetector detects the up light in the second tunnel in the boundary filter positioned at the upside of wavelength channel
During signal, electron process module will carry out the optical network unit of wavelength adjustment the need for determining accordingly, and will indicate letter accordingly
Breath is included into downstream signal.Here, the configured information can indicate that the optical network unit adjusts downwards temperature, to adjust downwards
Its upstream wavelength, or the temperature grade that the optical network unit is adjusted downwards is more specifically indicated, so that the clearly optical-fiber network list
The regulation step-length that member should be implemented.
Conversely, when photodetector detects the up light in the second tunnel in the boundary filter positioned at the downside of wavelength channel
During signal, electron process module will carry out the optical network unit of wavelength adjustment the need for determining accordingly, and will indicate letter accordingly
Breath is included into downstream signal.Here, the configured information can indicate that the optical network unit adjusts upward temperature, to be adjusted up
Its upstream wavelength.Similarly, the configured information can also include the temperature grade adjusted upward.
In summary, Fig. 2 embodiment can assist optical network unit by bidirectional modulation temperature come bidirectional modulation thereon
The wavelength of row signal.
Referring now to Fig. 3, the embodiment of Fig. 3 wavelength shift monitoring unit and Fig. 2 wavelength shift monitoring unit
Embodiment is similar, and it distinguishes the quantity for being the quantity of wave filter in the embodiments of figure 3 for upstream wavelength.Applying 4
In the case of individual upstream wavelength, with 4 boundary filters (lL, 2L, 3L, 4L).It is similar with the boundary filter in Fig. 2, should
A little boundary filters equally have boundary threshold, are also used for filtering the second amplified road uplink optical signal.With Fig. 2 embodiment
Difference, each boundary filter is located at the downside for the wavelength channel that 4 upstream wavelengths are allowed, namely thick wavelength-division demultiplexing respectively
The shortwave strong point of the passage allowed of device.In addition, power amplifier, photodetector and electricity in the embodiments of figure 3
The function mode of subprocessing module and Fig. 2 embodiment are similar, will not be described in detail herein.
In the embodiment of fig. 3, it is similar with Fig. 2 embodiment, when photodetector is under wavelength channel
When the second road uplink optical signal is detected in the boundary filter of side, electron process module carries out wavelength the need for determining accordingly
The optical network unit of adjustment, and corresponding configured information is included into downstream signal.Here, the configured information can indicate this
Optical network unit adjusts upward temperature, to adjust its upward upstream wavelength.Similarly, the configured information can also be included to up-regulation
Whole temperature grade.
Therefore, Fig. 3 embodiment can assist optical network unit and its up letter is unidirectionally adjusted by unidirectionally adjusting temperature
Number wavelength.This can be with cost-effective, and can for example apply when in optical network unit starting, and optical network unit is set
In the situation of room temperature.
Turning now to Fig. 1, descending multichannel transmitter by the configured information received from wavelength shift monitoring unit include to
In downlink optical signal, and the downlink optical signal is sent via array waveguide grating and wavelength-division multiplex element.Here, Waveguide array light
Grid are used for the downlink optical signal for being multiplexed multichannel.
The operation of the side of optical network unit 1 is described referring now to Fig. 1.As shown in figure 1, optical network unit 1 includes ripple
Divide multiplex element, it is used to being multiplexed and demultiplexing uplink optical signal and downlink optical signal.Being additionally provided with optical network unit 1 can
Receiver is adjusted, it includes tunable filter and receiver.Tunable receiver receives downlink optical signal by wavelength-division multiplex element.
This, the downlink optical signal can include configured information, and it indicates that the optical network unit needs the ripple of its uplink optical signal of coarse adjustment
It is long.Additionally, the configured information includes the regulation that the optical network unit needs the wavelength of its uplink optical signal sent of coarse adjustment
Step-length.
Thermoregulator in optical network unit 1 will be adjusted temperature grade according to configured information and be sent out with coarse adjustment emitter
The wavelength of the uplink optical signal sent, wherein temperature grade correspond to thick regulation step-length.
Fig. 4 shows the corresponding relation according to the temperature grade of one embodiment of the present of invention and the regulation step-length of wavelength.
As shown in figure 4, with five 0 degree, 20 degree, 40 degree, 60 degree and 80 degree of temperature grades.Often it is adjusted up a temperature grade, ripple
Length will correspondingly increase about 0.8nm, and vice versa.It is pointed out that above-mentioned corresponding relation is only exemplary, rather than limit
Property processed.In other embodiments, it would however also be possible to employ others correspondence regulation relation.Therefore, can be with by changing temperature
The coarse adjustment of wavelength is realized, this also greatly reduces cost while correct transmission is realized compared to original fine-tuning.
Specifically, when the wavelength shift monitoring unit of optical line terminal includes 2N boundary filter, (N is upstream wavelength
Quantity) when, thermoregulator is heat converter, and it will adjust temperature up or down according to configured information, be sent out with coarse adjustment
Penetrate the wavelength of the uplink optical signal of machine transmission.Reference picture 4, per a temperature grade is adjusted downward or upward, wavelength will all change
0.8nm, because the regulation step-length of wavelength is 0.8nm.Therefore, in the wavelength shift of heat application converter and optical line terminal
In the case that monitoring unit includes 2N boundary filter (in Fig. 1 with 8 boundary filters), it is possible to achieve upstream wavelength
Bidirectional modulation.
And when the wavelength shift monitoring unit of optical line terminal includes N number of boundary filter, thermoregulator is heating
Device, it is used to be adjusted up temperature according to configured information, the wavelength of the uplink optical signal sent with coarse adjustment emitter.Namely
In the case of this, it is possible to achieve unidirectional regulation.For example, referring to Fig. 4, a temperature grade is often heated, wavelength all will be with a tune
Section step-length 0.8nm changes upwards.As it was previously stated, this right and wrong in the case where the initial temperature of optical network unit is set to room temperature
Often applicable.Cost can further be saved by the embodiment.
Turning now to Fig. 1, the upstream wavelength adjusted with thermoregulator is sent up by the emitter in optical network unit 1
Signal.Here, the emitter both can be tunable laser or laser array.Therefore, application of the invention
It is quite extensive.
Fig. 5 shows the spectrogram according to one embodiment of the present of invention.In Figure 5 with the transmitting in optical network unit 1
Machine be laser array exemplified by be illustrated.As shown in figure 5, showing the up light that optical network unit is sent in the first row
The frequency spectrum of signal, it can for example have positive and negative 1nm error.
The spectrogram of coarse wavelength division demultiplexer is schematically shown in Fig. 5 the second row.It is used to filter and demultiplexed
With the uplink optical signal in the first row.
Boundary filter (lL, lR, 2L, 2R, 3L, 3R) 4L and 4R is schematically shown in Fig. 5 the third line) position
Put.The schematic diagram corresponds to the 2 times such case of the quantity of boundary filter for the quantity of uplink optical signal.As illustrated,
Boundary filter be located at coarse wavelength division demultiplexer frequency spectrum short wavelength and long wave strong point, namely its boundary threshold be located at allowed
Wavelength channel the upper side and lower side.As shown in figure 5, the embodiment supports 4 wavelength channels, and each wavelength channel institute
The scope of permission is 4.2nm.It should be noted that above-mentioned numerical value is only exemplary, and it is transformable (can for example lead to
Excess temperature changes to change boundary threshold or directly change boundary filter).Therefore, the present invention is also easy to extend to other feelings
Shape, such as upgoing wave long number are 8 situation.When filtering out uplink optical signal in these boundary filters, that is, show that wavelength crosses the border,
Corresponding optical network unit needs to adjust the wavelength of its upward signal.
It should be noted that above-described embodiment is only exemplary, rather than limitation of the present invention.It is any without departing substantially from this hair
The technical scheme of bright spirit all should be fallen under the scope of the present invention, and this including the use of occurring not in different embodiments
Same technical characteristic, installation method can be combined, to obtain beneficial effect.
Claims (15)
1. a kind of optical line terminal for time-division Wave division multiplexing passive optical network, wherein, in the time-division Wavelength division multiplexing-passive
In optical-fiber network apply N number of mutually different upstream wavelength and N number of mutually different downstream wavelength, the optical line terminal via point
Light device is connected with least one optical network unit, and the optical line terminal includes：
Wavelength-division multiplex element, for being multiplexed and demultiplexing uplink optical signal and downlink optical signal；
Coarse wavelength division demultiplexer, it is coupled with the wavelength-division multiplex element, for filtering and demultiplexing the uplink optical signal；
Photo-coupler, for first via uplink optical signal and the second tunnel will to be divided into through filtering and demultiplexed uplink optical signal
Traveling optical signal, wherein the power of the first via uplink optical signal is more than the power of second road uplink optical signal；
Uplink multi-path receiver, for receiving the first via uplink optical signal；
Descending multichannel transmitter, it sends the downlink optical signal via array waveguide grating and the wavelength-division multiplex element；With
And
Wavelength shift monitoring unit, for detecting that whether the wavelength of second road uplink optical signal crosses the border boundary threshold, works as inspection
Measure second road uplink optical signal wavelength cross the border boundary threshold when, it is determined that needing to adjust the optical-fiber network of the upstream wavelength
Unit, and configured information is included into the downlink optical signal of the descending multichannel transmitter, wherein the configured information is indicated
Identified optical network unit needs the wavelength of its uplink optical signal of coarse adjustment；
Wherein described wavelength shift monitoring unit includes：
Power amplifier, the power for amplifying second road uplink optical signal；
Multiple boundary filters, each boundary filter has boundary threshold, the up light letter in second tunnel amplified for filtering
Number；
Photodetector, for detecting whether the wavelength of second road uplink optical signal crosses the border boundary threshold；And
Electron process module, for when the wavelength for detecting second road uplink optical signal crosses the border boundary threshold, it is determined that needing
The optical network unit of the upstream wavelength is adjusted, and configured information is included into the descending light letter to the descending multichannel transmitter
In number.
2. optical line terminal according to claim 1, it is characterised in that the multiple boundary filter includes 2N border
Wave filter, the 2N boundary filter is located at the upper side and lower side for the wavelength channel that N number of upstream wavelength is allowed respectively.
3. optical line terminal according to claim 1, it is characterised in that the multiple boundary filter includes N number of border
Wave filter, N number of boundary filter is located at the downside for the wavelength channel that N number of upstream wavelength is allowed respectively.
4. optical line terminal according to claim 1, it is characterised in that the coarse wavelength division demultiplexer is filter plate.
5. optical line terminal according to claim 1, it is characterised in that the border can be changed by temperature control and filtered
The boundary threshold of ripple device.
6. optical line terminal according to claim 1, it is characterised in that the boundary filter is replaceable.
7. the optical line terminal according to Claims 2 or 3, it is characterised in that N is equal to 4.
8. optical line terminal according to claim 1, it is characterised in that the configured information includes identified optical-fiber network
Unit needs the regulation step-length of the wavelength of its uplink optical signal sent of coarse adjustment.
9. optical line terminal according to claim 1, it is characterised in that the power of the first via uplink optical signal accounts for institute
The 95% of the power of uplink optical signal is stated, the power of second road uplink optical signal accounts for the power of the uplink optical signal
5%, or the first via uplink optical signal power account for the uplink optical signal power 90%, the up light in the second tunnel
The power of signal accounts for the 10% of the power of the uplink optical signal.
10. a kind of optical network unit for time-division Wave division multiplexing passive optical network, wherein, in the time-division Wavelength division multiplexing-passive
N number of mutually different upstream wavelength and N number of mutually different downstream wavelength are applied in optical-fiber network, optical line terminal is via optical splitter
It is connected with the optical network unit, the optical network unit includes：
Wavelength-division multiplex element, for being multiplexed and demultiplexing uplink optical signal and downlink optical signal；
Tunable receiver, for receiving the downlink optical signal by the wavelength-division multiplex element, the downlink optical signal includes
Configured information, the configured information indicates that the optical network unit needs the wavelength of its uplink optical signal of coarse adjustment；
Emitter, for sending the uplink optical signal by the wavelength-division multiplex element；And
Thermoregulator, its adjusted according to the configured information temperature grade described in coarse adjustment emitter send it is described on
The wavelength of traveling optical signal, wherein the temperature grade corresponds to thick regulation step-length.
11. optical network unit according to claim 10, it is characterised in that when the wavelength shift of the optical line terminal is supervised
When controlling unit including 2N boundary filter, the thermoregulator is heat converter, and it is used for according to the configured information
Temperature is adjusted up or down, the wavelength of the uplink optical signal sent with emitter described in coarse adjustment.
12. optical network unit according to claim 10, it is characterised in that when the wavelength shift of the optical line terminal is supervised
When controlling unit and including N number of boundary filter, the thermoregulator is heater, and it is used for according to the configured information to up-regulation
Temperature is saved, the wavelength of the uplink optical signal sent with emitter described in coarse adjustment.
13. optical network unit according to claim 10, it is characterised in that the emitter includes tunable laser and swashed
Light device array.
14. optical network unit according to claim 10, it is characterised in that the configured information includes the optical-fiber network list
Member needs the regulation step-length of the wavelength of its uplink optical signal sent of coarse adjustment.
15. optical network unit according to claim 10, it is characterised in that the tunable receiver includes tunable filter
And receiver.
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| CN201310396493.0A CN104426610B (en) | 2013-09-03 | 2013-09-03 | Optical line terminal and optical network unit |
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| CN107911190B (en) * | 2017-12-29 | 2019-03-08 | 武汉长光科技有限公司 | A kind of optical line terminal for supporting ultra dense wavelength division multiple |
| CN113472450A (en) * | 2018-01-26 | 2021-10-01 | 华为技术有限公司 | OLT, ONU, PON system and information transmission method in PON system |
| CN110912615A (en) * | 2019-11-29 | 2020-03-24 | 四川天邑康和通信股份有限公司 | Laser wavelength drift rapid screening method for optical module product |
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