CN103002358A - Optical network unit of passive optical network and control method thereof - Google Patents
Optical network unit of passive optical network and control method thereof Download PDFInfo
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Abstract
An optical network unit of a passive optical network and a control method thereof. The optical network unit receives a downlink signal from a passive optical network, wherein the downlink signal includes a data signal or further includes a continuous optical wave. The optical network unit comprises a coupler, a reflective semiconductor optical amplifier, a receiver and a controller. The coupler splits the continuous lightwave or data signal into a first portion and a second portion. The reflective semiconductor optical amplifier amplifies and remodulates the first portion, and then uploads the first portion to the passive optical network. The receiver measures the power injected into the receiver by the second part. The controller controls the uploading speed of the reflective semiconductor optical amplifier according to the incident power.
Description
Technical field
The present invention relates to the optical network unit (ONU:optical network unit) and its control method of a kind of EPON (PON:passive optical network).
Background technology
At traditional wavelength-division multiplex (MUX) EPON (wavelength-division multiplexing passive optical network, be called for short WDM PON) among, optical fiber head end (OLT:optical line terminal) can divide a plurality of optical network units (ONU:optical networking unit) of delivering to user side with the lower number of delivering a letter by wavelength-division multiplexer (wavelength-division multiplexer), also can receive by the wavelength-division multiplexer signal of uploading of a plurality of optical network units.In the system of wavelength-division multiplex (MUX) EPON, each transmits the signal of each optical network unit with different wave length.If certain user's optical network unit damages, must replace with the equipment of identical wavelength.
Therefore, the someone proposes to use the wavelength-division multiplex (MUX) EPON (colorless WDM-PON) of colourless light source, and the various different wave lengths in its optical network unit acceptable operating scope are to solve the problem of above-mentioned optical network unit and specific wavelength binding.
Fig. 1 is a kind of schematic diagram of traditional colourless wavelength-division multiplex (MUX) EPON 100.EPON 100 adopts reflective semiconductor optical amplifier (reflective semiconductor optical amplifier, be called for short RSOA), but because RSOA amplified broad band signal, and be not subjected to light polarization (polarization) impact, be applicable to following wavelength-division multiplex (MUX) EPON or colourless wavelength-division multiplex (MUX) EPON.Wherein, each laser diode of optical fiber head end 140 (LD:laser diode) 111～113 separately the respective user end optical network unit 160,170 and 180 one of them, each receiver 121～123 also separately the optical network unit 160 of respective user end, 170 and 180 one of them.The corresponding user of each optical network unit.Each laser diode is the light source of the lower number of delivering a letter that receives of its corresponding optical network unit.Each user's the lower number of delivering a letter is merged into single signal by wavelength-division multiplexer 131, is sent to the wavelength-division multiplexer 151 of distant-end node (remote node) 150 via light circulator (optical circulator) 133.
Each wavelength-division multiplexer of Fig. 1 is filter (filter).For example wavelength-division multiplexer 151 can utilize the different wave length that different optical network units receive, and above-mentioned single signal is decomposed into the number of delivering a letter under different wave length a plurality of, and each lower number of delivering a letter is sent to corresponding optical network unit.Each optical network unit has same configuration, and for example optical network unit 160 comprises coupler (coupler) 161, RSOA 162 and receiver 163.Optical coupler 161 is divided into two parts that power equates with the lower number of delivering a letter, and receiver 163 receives wherein a part of to process down the data in the number of delivering a letter.The lower number of delivering a letter of 162 pairs of another part of RSOA is amplified and modulation (remodulation) data wanting to upload to load optical network unit 160 again, then will be uploaded to through amplification and heavy fresh signal the wavelength-division multiplexer 151 of distant-end node 150.
Wavelength-division multiplexer 151 will synthesize single signal from the signal of uploading of each optical network unit, be sent to wavelength-division multiplexer 132 via light circulator 133.Wavelength-division multiplexer 132 is decomposed into the signal of uploading of each optical network unit with single signal, each is uploaded signal be sent to corresponding receiver 121～123.
Present EPON has gauged distance (standard-reach) EPON and long apart from two kinds of (long-reach) EPONs.Fig. 2 illustrates a kind of traditional gauged distance EPON.Wherein, capital node 221 that all can network (metro network) 220 is via a plurality of optical fiber head ends of wavelength-division multiplexer 222 connectivity serving networks (access network) 240, and for example the optical fiber head end 241.Each optical fiber head end connects a plurality of optical network units, and for example optical fiber head end 241 connects a plurality of optical network units 242.In the EPON of gauged distance, the distance between optical fiber head end and the optical network unit generally is no more than 25 kilometers.
Fig. 3 illustrates a kind of traditional long-distance passive optical network 320.For energy savings, optical fiber head end 322 is moved into all can node 321.Optical fiber head end 322 via wavelength-division multiplexer 323 with the lower number of delivering a letter from all can node 321 delivering to numerous optical network units in downstream, for example optical network unit 324.In the EPON of long distance, the distance between optical fiber head end and the optical network unit can reach 100 kilometers.
Summary of the invention
The invention provides a kind of optical network unit and its control method, can dynamically adjust the uploading rate of RSOA (upstream data rate) according to the power (injection power) of injecting of RSOA, and then the bit error rate of uploading signal (BER:bit error rate) of optical network unit is controlled in the permissible range.
The present invention proposes a kind of optical network unit, and this optical network unit receives the number of delivering a letter from an EPON, and number of delivering a letter comprises a continuous light wave (continuous wave) under this.Above-mentioned optical network unit comprises coupler, RSOA, receiver and controller.Coupler receives continuous light wave, is first and second portion with the continuous light wavelength-division.RSOA couples coupler, and first is amplified and again modulation, then uploads first to EPON.Receiver couples coupler, receives second portion, and measures second portion to the power of injecting of receiver.Controller couples RSOA and receiver, according to the above-mentioned uploading rate of injecting power control RSOA.
The present invention proposes a kind of optical network unit in addition, and this optical network unit receives the number of delivering a letter from an EPON, and number of delivering a letter comprises a data-signal under this.Above-mentioned optical network unit comprises coupler, RSOA, receiver and controller.The coupler reception of data signal is divided into first and second portion with data-signal.RSOA couples coupler, and first is amplified and again modulation, then uploads first to EPON.Receiver couples coupler, receives second portion, and measures second portion to the power of injecting of receiver, and processes the data-signal of second portion.Controller couples RSOA and receiver, according to the above-mentioned uploading rate of injecting power control RSOA.
The present invention proposes a kind of control method in addition, is used for control one optical network unit, and this optical network unit comprises RSOA, and above-mentioned control method comprises the following steps: to receive the number of delivering a letter from an EPON, and number of delivering a letter comprises a continuous light wave under this; Be first and second portion with the continuous light wavelength-division; Use RSOA that first is amplified and again modulation, then upload first to EPON; Measure the power of injecting of second portion; And according to the above-mentioned uploading rate of injecting power control RSOA.
The present invention proposes a kind of control method in addition, is used for control one optical network unit, and this optical network unit comprises RSOA, and above-mentioned control method comprises the following steps: to receive the number of delivering a letter from an EPON, and number of delivering a letter comprises a data-signal under this; Data-signal is divided into first and second portion; Use RSOA that first is amplified and again modulation, then upload first to EPON; Measure the power of injecting of second portion, and process the data-signal of second portion; And according to the above-mentioned uploading rate of injecting power control RSOA.
Based on above-mentioned, the present invention can be according to the uploading rate that power is dynamically adjusted RSOA of injecting of RSOA.Reduce if inject power, can decrease the uploading rate of RSOA, upload the bit error rate of signal with guarantee.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate accompanying drawing to be described in detail below.
Description of drawings
Fig. 1, Fig. 2 and Fig. 3 are the schematic diagrames of known EPON.
Fig. 4 is according to a kind of optical network unit of one embodiment of the invention and the schematic diagram of EPON.
Fig. 5 is according to a kind of optical network unit of another embodiment of the present invention and the schematic diagram of EPON.
Fig. 6 illustrates the experimental data according to one embodiment of the invention.
Fig. 7 is the flow chart according to the control method of a kind of optical network unit of one embodiment of the invention.
Fig. 8 is the flow chart according to the control method of a kind of optical network unit of another embodiment of the present invention.
[main element symbol description]
100,320,400,500: EPON
111～113: laser diode
121～123,163,423,464,466,522,563: receiver
131,132,151,222,323,422,424,442,521,523,542: the wavelength-division multiplexer
133,441,541: light circulator
150,440,540: distant-end node
160,170,180,242,324,460,470,480,560,570,580: optical network unit
161,462,561: coupler
162,463,562: reflective semiconductor optical amplifier
220: all can network
221,321: all can node
240: service network
241,322,420,520: the optical fiber head end
421,461: band filter
465,564: controller
710～770,810～850: process step
CW: continuous light wave
DS: data-signal
Embodiment
Fig. 4 is according to a kind of optical network unit 460 of one embodiment of the invention and the schematic diagram of EPON 400.Although the optical fiber head end 420 of EPON 400 only illustrates 421 and receivers 423 of a band filter (red/blue filter), optical fiber head end 420 can comprise a plurality of band filter and a plurality of receiver in fact, each user each corresponding one of them band filter and a receiver.Take band filter 421 as example, each user's the lower number of delivering a letter comprises a continuous light wave CW and a data-signal DS, light wave CW and data-signal DS respectively use the different-waveband transmission continuously, for example light wave CW uses red spectral band (red band) transmission continuously, and data-signal DS uses blue wave band (blue band) transmission.Band filter 421 is with continuous light wave CW and the synthetic single lower number of delivering a letter of data-signal DS, then wavelength-division multiplexer 422 is sent to distant-end node 440 with the further synthetic single signal of each user's the lower number of delivering a letter, and is sent to wavelength-division multiplexer 442 via wherein light circulator 441.
Wavelength-division multiplexer 442 is a plurality of lower number of delivering a letter for each user of the signal decomposition that receives, and each lower number of delivering a letter is sent to the optical network unit of correspondence, for example optical network unit 460,470 and 480.Each optical network unit of Fig. 4 has same configuration, and below explanation is take optical network unit 460 as example.Optical network unit 460 comprises the band filter 461 that couples EPON 400, the coupler 462 that couples band filter 461 and receiver 466, the RSOA 463 that couples coupler 462 and receiver 464 and couples RSOA 463 and the controller 465 of receiver 464.
Band filter 461 number of delivering a letter under EPON 400 receives, and with the continuous light wave CW in the lower number of delivering a letter and extremely original two wave bands that use of data-signal DS difference cutting, for example with continuous light wave CW cutting to red spectral band, with data-signal DS cutting to blue wave band.
Receiver 461 receives and processes the data-signal DS of blue wave band.Coupler 462 receives the continuous light wave CW of red spectral bands, and continuous light wave CW is divided into two parts, and this two-part continuous light wave CW injects power and can be a preset ratio.For example, if above-mentioned preset ratio is 1: 1, then coupler 462 is divided into two identical continuous light waves of power with continuous light wave CW.
The first of 463 couples of continuous light wave CW of RSOA amplifies and again modulation, then upload through amplification and the first of heavy fresh continuous light wave CW to EPON 400.Receiver 464 receives the second portion of continuous light wave CW and measures this second portion to the power of injecting of receiver 464.Controller 465 is according to the above-mentioned uploading rate (details aftermentioned) of injecting power control RSOA 463.
Next, the wavelength-division multiplexer 442 of distant-end node 440 will synthesize single signal from the signal of uploading of each optical network unit, be sent to the wavelength-division multiplexer 424 of optical fiber head end 420 via light circulator 441.Wavelength-division multiplexer 424 is decomposed into a plurality of signals of uploading from each optical network unit with the single signal that receives, and then each is uploaded signal and is sent to corresponding receiver, and for example receiver 423.
In the explanation in front, light wave CW uses the red spectral band transmission continuously, and data-signal DS uses the blue wave band transmission, but the present invention is not as limit.In other embodiments, above Red and blue light wave band can be used its all band instead.
Fig. 5 is according to a kind of optical network unit 560 of another embodiment of the present invention and the schematic diagram of EPON 500.The similar Fig. 4 of the embodiment of Fig. 5, but in this embodiment, each user's the lower number of delivering a letter only comprises data-signal DS.Each optical network unit of Fig. 5 has same architecture, and below explanation is take optical network unit 560 as example.Optical network unit 560 comprises the coupler 561 that couples EPON 500, the RSOA 562 that couples coupler 561 and receiver 563 and couples RSOA 562 and the controller 564 of receiver 563.
The function of other elements of Fig. 5 and mode of operation, all the counter element with Fig. 4 is identical, so it will not go into details.
The EPON 400 of Fig. 4 and the EPON 500 of Fig. 5 can produce down the number of delivering a letter with colourless light source.The EPON 400 of Fig. 4 and the EPON 500 of Fig. 5 can be gauged distance EPON or long-distance passive optical network.The EPON that Fig. 4 and Fig. 5 illustrate all is wavelength-division multiplex (MUX) EPON, but in other embodiments of the invention, also can use wavelength-division multiplex (MUX) time division multiplexing EPON (wavelength-division multiplexing time-division multiplexing passive optical network is called for short WDM-TDM PON) instead.
Fig. 6 illustrates the experimental data according to one embodiment of the invention.The corresponding relation of the bit error rate of uploading signal of injecting power and RSOA463 when the uploading rate of RSOA 463 is respectively 6.22Mb/s, 1.25Gb/s and 2.5Gb/s of the continuous light wave CW that present embodiment use optical network unit 460 measurement RSOA 463 as shown in Figure 4 receive.Wherein transverse axis be RSOA 463 receive inject power, the longitudinal axis is the bit error rate of uploading signal (use logarithmic coordinates) of RSOA 463.For example, when the uploading rate of RSOA 463 is respectively 6.22Mb/s, 1.25Gb/s and 2.5Gb/s, remain on below the 10-9 if will upload the bit error rate of signal, then RSOA 463 inject power must be respectively-21dBm ,-18dBm and-more than the 10dBm.This is because the uploading rate of RSOA depends on again modulation rate, and the again modulation rate of RSOA is directly proportional with the power of injecting of its reception.If inject power less than above critical value, the bit error rate of uploading signal will exceed 10-9, has a strong impact on communication quality.
For the maintain communications quality, must guarantee that RSOA receives the enough power of injecting.But each element of EPON, for example optical fiber, light circulator and wavelength-division multiplexer all can cause the power attenuation of light signal, reduce the power of injecting that RSOA receives.The LASER Light Source of optical fiber head end aging also can reduce the power of injecting that RSOA receives.If the power of injecting of RSOA has been lower than critical value, also continue to keep original uploading rate, the bit error rate of then uploading signal will be too high, when serious the quality of uploading signal can't be accepted.This moment should dynamic reducing RSOA uploading rate, could ensure the bit error rate of uploading signal.
As previously mentioned, coupler 462 is two parts with continuous light wave CW cutting, transfers to respectively RSOA463 and receiver 464, and this two-part power is a preset ratio.Controller 465 can be learnt the second portion of continuous light wave CW for the power of injecting of receiver 464 by receiver 464, then can calculate that the first of continuous light wave CW is for the power of injecting of RSOA 463 according to above-mentioned preset ratio.Therefore, the first of the continuous light wave CW that controller 465 can receive according to RSOA 463 injects power and experimental data as shown in Figure 6, dynamically adjust the uploading rate of RSOA 463, make the bit error rate of uploading signal of RSOA 463 not exceed preset value, example 10-9 described above is to keep communication quality.
In order to reach above-mentioned control effect, controller 465 must be stored the corresponding relation between power and the bit error rate injected of as shown in Figure 6 experiment gained, and according to the uploading rate of this corresponding relation control RSOA 463.For example, controller 465 can be stored the corresponding power threshold of injecting of each uploading rate.When the power of injecting of RSOA 463 is lower than the present corresponding critical value of first uploading rate, controller 465 can switch to RSOA 463 second lower uploading rate.When the power of injecting of RSOA 463 is reduced to again second corresponding critical value of uploading rate, controller 465 can switch to RSOA463 the 3rd lower uploading rate.The bit error rate of uploading signal that so just can guarantee RSOA 463 does not exceed preset value all the time.As for uploading rate how to switch RSOA, can reach easily those skilled in the art, this is not emphasis of the present invention.
In like manner, the second portion of the data-signal DS that the controller 564 of Fig. 5 can receive according to receiver 563 inject power, calculate the data-signal DS that RSOA 562 receives first inject power, dynamically adjust according to this uploading rate of RSOA 562, make the bit error rate of uploading signal of RSOA 562 not exceed preset value.
Fig. 7 is the flow chart according to the control method of a kind of optical network unit of one embodiment of the invention, the optical network unit 460 of this control method corresponding diagram 4.At first, receive the number of delivering a letter from EPON, number of delivering a letter comprises continuous light wave and data-signal (step 710) under this.With continuous light wave and data-signal difference cutting to the first wave band and the second wave band (step 720).Be first and second portion (step 730) with the continuous light wavelength-division of the first wave band.Use RSOA that the first of continuous light wave is amplified and again modulation, then upload through amplifying and weighing fresh above-mentioned first to EPON (step 740).Measure continuous light wave second portion inject power (step 750).The uploading rate (step 760) of injecting power control RSOA according to above-mentioned second portion.And, receive and process the data-signal (step 770) of above-mentioned the second wave band.The correlative detail of the control method of Fig. 7 is described in detail at the embodiment of Fig. 4, repeats no more.
Fig. 8 is the flow chart according to the control method of a kind of optical network unit of another embodiment of the present invention, the optical network unit 560 of this control method corresponding diagram 5.At first, receive the number of delivering a letter from EPON, number of delivering a letter comprises a data-signal (step 810) under this.Data-signal is divided into first and second portion (step 820).Use RSOA that above-mentioned first is amplified and again modulation, then upload through amplifying and weighing fresh above-mentioned first to EPON (step 830).The second portion of measurement data signals inject power, and process the data-signal (step 840) of second portion.And, according to the uploading rate (step 850) of injecting power control RSOA of above-mentioned second portion.
In sum, the present invention can measure down the power of injecting of continuous light wave in the number of delivering a letter or data-signal, and injects the uploading rate that power is dynamically adjusted RSOA according to this, to keep the bit error rate of uploading signal of optical network unit.Even the power of the lower number of delivering a letter descends, the present invention still can keep the quality of uploading signal.
Although the present invention with embodiment openly as above; so it is not to limit the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the appended claims person of defining.
Claims (17)
1. an optical network unit receives the number of delivering a letter from an EPON, and number of delivering a letter comprises a continuous light wave under this, and this optical network unit comprises:
One coupler receives this continuous light wave, is a first and a second portion with this continuous light wavelength-division;
One reflective semiconductor optical amplifier couples this coupler, and this first is amplified and again modulation, then uploads this first to this EPON;
One first receiver couples this coupler, receives this second portion and measures this second portion to the power of injecting of this first receiver; And
One controller couples this reflective semiconductor optical amplifier and this first receiver, injects the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this.
2. optical network unit as claimed in claim 1, wherein this EPON uses colourless light source to produce the number of delivering a letter under this.
3. optical network unit as claimed in claim 1, wherein this EPON is gauged distance EPON or long-distance passive optical network.
4. optical network unit as claimed in claim 1, wherein this EPON is wavelength-division multiplex (MUX) EPON or wavelength-division multiplex (MUX) time division multiplexing EPON.
5. optical network unit as claimed in claim 1, wherein the power of injecting of this first and this second portion is a preset ratio.
6. optical network unit as claimed in claim 1, wherein this controller is injected the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this, so that the bit error rate of this first that this reflective semiconductor optical amplifier is uploaded does not exceed a preset value.
7. optical network unit as claimed in claim 6, wherein this controller is stored this and is injected corresponding relation between power and this bit error rate, and control the uploading rate of this reflective semiconductor optical amplifier according to this corresponding relation, so that this bit error rate does not exceed this preset value.
8. optical network unit as claimed in claim 1, wherein number of delivering a letter also comprises a data-signal under this, and this optical network unit also comprises:
One band filter is coupled between this EPON and this coupler, receives the number of delivering a letter under this, should distinguish cutting to the first wave band and one second wave band with this data-signal by continuous light wave, and wherein this coupler receives this continuous light wave of this first wave band; And
One second receiver couples this band filter, receives and process this data-signal of this second wave band.
9. an optical network unit receives the number of delivering a letter from an EPON, and number of delivering a letter comprises a data-signal under this, and this optical network unit comprises:
One coupler receives this data-signal, and this data-signal is divided into a first and a second portion;
One reflective semiconductor optical amplifier couples this coupler, and this first is amplified and again modulation, then uploads this first to this EPON;
One receiver couples this coupler, receives this second portion, measures this second portion to the power of injecting of this receiver, and processes this data-signal of this second portion; And
One controller couples this reflective semiconductor optical amplifier and this receiver, injects the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this.
10. optical network unit as claimed in claim 9, wherein the power of injecting of this first and this second portion is a preset ratio.
11. optical network unit as claimed in claim 9, wherein this controller is injected the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this, so that the bit error rate of this first that this reflective semiconductor optical amplifier is uploaded does not exceed a preset value.
12. optical network unit as claimed in claim 11, wherein this controller is stored this and is injected corresponding relation between power and this bit error rate, and control the uploading rate of this reflective semiconductor optical amplifier according to this corresponding relation, so that this bit error rate does not exceed this preset value.
13. a control method is used for control one optical network unit, this optical network unit comprises a reflective semiconductor optical amplifier, and this control method comprises:
Receive the number of delivering a letter from an EPON, wherein number of delivering a letter comprises a continuous light wave under this;
Be a first and a second portion with this continuous light wavelength-division;
Use this reflective semiconductor optical amplifier that this first is amplified and again modulation, then upload this first to this EPON;
Measure the power of injecting of this second portion; And
Inject the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this.
14. control method as claimed in claim 13 also comprises:
Inject the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this, so that the bit error rate of this first that this reflective semiconductor optical amplifier is uploaded does not exceed a preset value.
15. control method as claimed in claim 13, wherein number of delivering a letter also comprises a data-signal under this, and this control method also comprises:
Should distinguish cutting to the first wave band and one second wave band with this data-signal by continuous light wave;
Be this first and this second portion with this continuous light wavelength-division of this first wave band; And
Receive and process this data-signal of this second wave band.
16. a control method is used for control one optical network unit, this optical network unit comprises a reflective semiconductor optical amplifier, and this control method comprises:
Receive the number of delivering a letter from an EPON, number of delivering a letter comprises a data-signal under this;
This data-signal is divided into a first and a second portion;
Use this reflective semiconductor optical amplifier that this first is amplified and again modulation, then upload this first to this EPON;
Measure the power of injecting of this second portion, and process this data-signal of this second portion; And
Inject the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this.
17. control method as claimed in claim 16 also comprises:
Inject the uploading rate that power is controlled this reflective semiconductor optical amplifier according to this, so that the bit error rate of this first that this reflective semiconductor optical amplifier is uploaded does not exceed a preset value.
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| CN106341190A (en) * | 2015-07-07 | 2017-01-18 | 上海贝尔股份有限公司 | Passive optical network system and device thereof |
| CN106656325A (en) * | 2016-11-14 | 2017-05-10 | 浙江大学 | High-speed single-light source two-way free space laser communication system |
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| US9250388B1 (en) * | 2014-07-17 | 2016-02-02 | Intel Corporation | Optical device using echelle grating that provides total internal reflection of light |
| US10197737B2 (en) | 2017-06-19 | 2019-02-05 | Intel Corporation | Low back reflection echelle grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104995854A (en) * | 2013-01-10 | 2015-10-21 | 奥林奇公司 | Reflecting method and device for performing the receiving function of an optical access network using wavelength division multiplexing |
| CN104995854B (en) * | 2013-01-10 | 2017-06-30 | 奥林奇公司 | Perform the method for reflection and device of the receive capabilities using the optical access network of wavelength-division multiplex |
| CN106341190A (en) * | 2015-07-07 | 2017-01-18 | 上海贝尔股份有限公司 | Passive optical network system and device thereof |
| CN106341190B (en) * | 2015-07-07 | 2019-10-25 | 上海诺基亚贝尔股份有限公司 | A kind of passive optical network and its device |
| CN106656325A (en) * | 2016-11-14 | 2017-05-10 | 浙江大学 | High-speed single-light source two-way free space laser communication system |
| CN106656325B (en) * | 2016-11-14 | 2019-04-30 | 浙江大学 | A kind of two-way free space laser communication system of the single light source of high speed |
Also Published As
| Publication number | Publication date |
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| CN103002358B (en) | 2016-03-30 |
| TWI473445B (en) | 2015-02-11 |
| TW201312956A (en) | 2013-03-16 |
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