CN104579536B - Upper and lower row of channels reuses WDM passive optical network system - Google Patents
Upper and lower row of channels reuses WDM passive optical network system Download PDFInfo
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Abstract
The present invention relates to a kind of row of channels up and down to reuse WDM passive optical network system, the system produces beat frequency power by the second photoreceiver, the wavelength of the second optical sender is adjusted according to beat frequency noise watt level, so as to adjust the wavelength difference of the second optical sender and the first optical transmitter, in upper and lower row of channels reuses communication equipment, ensure to reduce backward Rayleigh scattering while OUN colourless property.
Description
Technical field
The present invention relates to communication technical field, and Wavelength division multiplexing-passive light is reused in particular to a kind of row of channels up and down
Network system.
Background technology
In recent years, with the fast development of broadband services and continuing to bring out for various new business, user is to network insertion band
Wide demand increases substantially, and Wave division multiplexing passive optical network (WDM PON) technology receives extensive concern both domestic and external.WDM
PON combines the advantages of WDM (extra long distance optical transport) technologies and PON (passive optical-fiber network) topological structure, is a kind of broadband
The PON access network technologies of Large Copacity, it is considered to be most prospect and desired access network technology of future generation.
WDM PON provide special wavelength WDM PON for each optical network unit ONU subscriber unit, and this will greatly be carried
Available bandwidth is risen however, available spectrum resource is limited in WDM PON, it is further raising system to improve spectrum utilization factor
The key technical problem of capacity.Improving the method that spectrum efficiency uses at present includes：Improve Single wavelength speed, reduce channel spacing
And up-downgoing Wavelength reuse.But these methods can bring the problems such as system cost increase, decline of systematic function.For pursuing
The access network of low cost, for high performance access network it is not optimal scheme.
Each ONU configures different wavelength in system, therefore realizes the colorless ONU technology to the configuration of ONU length flexibles
It is a key technology of the system.Colorless ONU technology can realize ONU uniformity, be easy to produce in batches, simplify network
Installation and management service work, can effectively reduce ONU costs and operation cost.Current colorless ONU technology includes：Based on spectrum
The colorless ONU of cutting techniques, based on the colorless ONU of Wavelength reuse technology, the colorless ONU and base issued based on seed light source array
In the colorless ONU of tunable transmitter.Due to high modulation bandwidth, the optical transport of long range superelevation speed can be supported, based on adjustable
The colorless ONU of humorous optical sender is considered as one of optimal scheme.
The content of the invention
The technical problems to be solved by the invention are, how in upper and lower row of channels reuses communication equipment, ensure that OUN is colourless
Backward Rayleigh scattering is reduced while property.
For this purpose, the present invention, which proposes a kind of row of channels up and down, reuses WDM passive optical network system, including：Light
Line terminal, feeder fiber, the second OWDM demultiplexer, branch optical fiber and n optical network unit, wherein, the light
Line terminal includes：First OWDM demultiplexer, and the photoreceiver of n groups first, the first optical sender and the first light
Circulator, the first photoreceiver and the first optical sender in every group are connected to first light wave point by the first optical circulator
Multiplexer and demultiplexer, n are integer more than 1, and the first OWDM demultiplexer is in downlink transmission direction, by each the
The downstream signal of one optical sender is multiplexed with signal all the way and transmitted to the feeder fiber, will be from described in uplink direction
Each first photoreceiver is transmitted separately to after the upward signal demultiplexing that feeder fiber receives, the feeder fiber will receive
Multiplexing downstream signal feed-in described in the second OWDM demultiplexer, by described in the multiplexing upward signal feed-in received
One OWDM demultiplexer, the second OWDM demultiplexer demultiplex FD feed in downlink transmission direction
Transmit after to the branch optical fiber, transmitted behind uplink direction, the signal multiplexing that will be received from the branch optical fiber
To the feeder fiber, each optical network unit includes：Second optical sender, the second photoreceiver, the second optical circulator and
Control unit, wherein, second photoreceiver is received by second optical circulator and comes from second OWDM
The downstream signal of demultiplexer, described control unit controls the second optical sender ground connection, according to second optical sender
Output wavelength and the beat frequency power of second photoreceiver carry out power analysis and wavelength and set, complete power analysis and ripple
Second optical sender is controlled to disconnect the connection with ground after long setting, second optical sender is modulated to upward signal
And transmitting, wherein, passband center wavelengths and second light wave in the first OWDM demultiplexer wavelength channel
The passband center wavelengths divided in the corresponding wavelength channel of multiplexer and demultiplexer are equal, the operation wavelength of second optical sender,
Preset value is offset relative to the passband center wavelengths of the second OWDM demultiplexer.
Preferably, the passband center wavelengths of n wavelength channel of the first OWDM demultiplexer are respectively λ1、
λ2、…、λn, n n wavelength channels of first optical circulator respectively with the first OWDM demultiplexer are connected, its
In, in the operation wavelength of first optical sender and the corresponding wavelength channel of the first OWDM demultiplexer
Passband center wavelengths are equal.
Preferably, the passband center wavelengths of n wavelength channel of the second OWDM demultiplexer are respectively λ1、
λ2、…、λn, n n wavelength channels of second optical circulator respectively with the second OWDM demultiplexer are connected, its
In, the operation wavelength of second optical sender is relative to the corresponding wavelength channel of the second OWDM demultiplexer
In passband center wavelengths skew preset value.
Preferably, second photoreceiver includes：Light receiving element, spectrophotometric unit, photo-coupler, photodetector and
Microwave power meter is received, wherein, the light receiving element receives the downstream signal from second optical circulator, the light splitting
Unit receives the downstream signal from second optical circulator, and the photo-coupler is received from the part of the spectrophotometric unit
Downstream signal and the part upward signal from second optical sender, and both are coupled, by the letter after coupling
Number transmit to the photodetector, the photodetector is used to produce beat frequency noise, and the microwave power meter is used to detect
The beat frequency power of the beat frequency noise.
Preferably, the bandwidth of the photo-detector is less than 10GHz.
Preferably, the spectrophotometric unit includes：First optical splitter, it is arranged at second optical circulator and the optical coupling
Between device, for transmitting and adjusting the power of the part downstream signal from second optical circulator.
Preferably, the spectrophotometric unit also includes：Second optical splitter, it is arranged at second optical sender and the optocoupler
Between clutch, for transmitting and adjusting the power of the part upward signal from second optical sender.
Pass through above-mentioned technical proposal, spectrum efficiency can be effectively improved so that WDM PON system total capacities are improved, together
When can also reduce the influence of backward Rayleigh scattering, improve signal quality.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to accompanying drawing, accompanying drawing is schematically without that should manage
Solve to carry out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows that row of channels up and down according to an embodiment of the invention reuses the structure of Wavelength division multiplexing-passive photosystem
Schematic diagram；
Fig. 2 shows the concrete structure schematic diagram of the second photoreceiver according to an embodiment of the invention；
Fig. 3 shows that the second photoreceiver according to an embodiment of the invention produces the schematic diagram of beat frequency noise；
Fig. 4 shows according to an embodiment of the invention to the reuse Wavelength division multiplexing-passive photosystem checking of upper and lower row of channels
Schematic diagram；
Fig. 5 shows that row of channels up and down according to an embodiment of the invention reuses the mistake that Wavelength division multiplexing-passive spectrum obtains
Rate curve figure；
Fig. 6 A to Fig. 6 F show the second optical sender according to an embodiment of the invention and the second OWDM solution
The schematic diagram of the wavelength difference of multiplexer and corresponding spectrum；
Fig. 7 shows the second optical sender according to an embodiment of the invention and the second OWDM demultiplexer
The schematic diagram of wavelength difference and corresponding beat frequency power.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
As shown in figure 1, row of channels up and down according to an embodiment of the invention reuses WDM passive optical network system,
Including：Optical line terminal, feeder fiber 301, the second OWDM demultiplexer 203, branch optical fiber and n optical-fiber network list
Member, wherein, optical line terminal includes：First OWDM demultiplexer 103, and the first photoreceiver of n groups 102, first
The optical circulator 104 of optical sender 101 and first, the first photoreceiver 102 and the first optical sender 101 in every group pass through first
Optical circulator 104 is connected to the first OWDM demultiplexer 103, and n is the integer more than 1, and the first OWDM demultiplexes
With device 103 in downlink transmission direction, the downstream signal of each first optical sender 101 is multiplexed with signal all the way and transmitted to feeder line
Optical fiber 301, in uplink direction, each the will be transmitted separately to after the upward signal received from feeder fiber 301 demultiplexing
One photoreceiver 102, multiplexing downstream signal the second OWDM of feed-in demultiplexer 203 that feeder fiber 301 will receive,
Multiplexing upward signal the first OWDM of the feed-in demultiplexer 103 that will be received, the second OWDM demultiplexer 203
In downlink transmission direction, transmitted after FD feed is demultiplexed to the fibre of branch's light 205, will be from branch's light in uplink direction
Being transmitted after the signal multiplexing that fibre 205 receives to feeder fiber 301, each optical network unit includes：Second optical sender 201,
Second photoreceiver 202, the second optical circulator and control unit 206, wherein, the second photoreceiver 202 passes through second ring of light
Shape device 204 receives 203 downstream signals from the second OWDM demultiplexer, and control unit 206 controls the transmitting of the second light
Machine 201 is grounded, and power point is carried out according to the beat frequency power of the output wavelength of the second optical sender 201 and the second photoreceiver 202
Analysis and wavelength are set, and control the second optical sender 201 to disconnect the connection with ground, the second light after completing power analysis and wavelength setting
Emitter 201 is modulated and launched to upward signal, wherein, the passband center wavelengths of the first OWDM demultiplexer and
Passband center wavelengths corresponding to second OWDM demultiplexer are equal, the operation wavelength of the second optical sender 201, relative to
The passband center wavelengths skew preset value of second OWDM demultiplexer 203.
Second photoreceiver can produce beat frequency noise, and can be accurately set by the wavelength set-up mode of beat frequency noise
The operation wavelength of one optical sender, so as to realize that upper and lower row of channels reuses and ensured ONU colourless property, and effectively above and below control
Row signal light wavelength is to produce certain deviation.
It is same or like descending of wavelength that the mode of beat frequency noise, which sets the general principle of tunable optical transmitter wavelength,
The continuous light (Continuous Wavelength, CW) that the tunable optical emitter of flashlight and unmodulated signal is sent is through coupling
Low bandwidth (below 1GHz) photodetector is inputted after conjunction can produce beat frequency noise by being set to tunable optical transmitter wavelength
The detection with beat frequency noise is put, the accurate control to tunable optical transmitter wavelength can be achieved, so that upstream signal wavelengths
With downstream signal wavelengths (the i.e. operation wavelength of the second optical sender and the bandpass center ripple of the second OWDM demultiplexer
It is long) offset needed is produced, and then influence of the rayleigh noise to uplink and downlink signals in passage reuse system is reduced as needed
(OSNR for reducing signal).
Preferably, the passband center wavelengths of first n wavelength channel of OWDM demultiplexer are respectively λ1、λ2、…、
λn, n n wavelength channels of first optical circulator respectively with the first OWDM demultiplexer are connected, wherein, the first light is sent out
The passband center wavelengths penetrated in the operation wavelength and the wavelength channel that the first OWDM demultiplexer is corresponding of machine are equal.
Preferably, the passband center wavelengths of second n wavelength channel of OWDM demultiplexer are respectively λ1、λ2、…、
λn, n n wavelength channels of second optical circulator respectively with the second OWDM demultiplexer are connected, wherein, the second light is sent out
The operation wavelength for penetrating machine is inclined relative to the passband center wavelengths in the corresponding wavelength channel of the second OWDM demultiplexer
Move preset value.
As shown in Figure 2, it is preferable that the second photoreceiver 202 includes：Light receiving element, spectrophotometric unit, photo-coupler, light
Electric explorer 2021 and reception microwave power meter 2022, wherein, light receiving element is received from the descending of the second optical circulator 204
Signal, spectrophotometric unit receive the downstream signal from the second optical circulator, and photo-coupler is received under the part from spectrophotometric unit
Row signal and the part upward signal from the second optical sender 201, and both are coupled, the signal after coupling is passed
Photodetector 2021 is transported to, photodetector 2021 is used to produce beat frequency noise, and microwave power meter 2022 is used to detect beat frequency
The beat frequency power of noise.Wherein control unit 206 can control the connection of the first optical sender and ground by switching.
The process of second photoreceiver generation beat frequency noise can be equivalent to the signals transmission shown in Fig. 3.DWDM light
Transmitter module sends 10Gb/s rate signals, and through an OWDM/demultiplexing module (i.e. the first OWDM solution
Multiplexer, can be specifically waveguide array grating) and optical splitter (i.e. the first optical splitter) be coupled to the 3dB light of one 2 × 2
Coupler, tunable optical emitter (i.e. the first optical sender) output light of a unmodulated signal through another optical splitter (i.e.
Second optical splitter) after be also coupled to this photo-coupler of identical 2 × 2, the output end of this 2 × 2 photo-coupler and a low bandwidth light
The input of electric explorer (with a width of below 10GHz) is connected, for producing beat frequency noise, the output end of this photodetector
It is connected with a microwave power meter (Microwave Power Meter), this microwave power meter is used to measure beat frequency noise power.
First optical splitter and the second optical splitter can be used for the two-way luminous power size of adjustment 2 × 2 photo-couplers of input, and then adjust beat frequency
Noise power.
Preferably, the bandwidth of photo-detector is less than 10GHz.
Preferably, the spectrophotometric unit includes：First optical splitter 2023, it is arranged at second optical circulator 204 and institute
Between stating photo-coupler, for transmitting and adjusting the power of the part downstream signal from second optical circulator 204；Second
Optical splitter 2024, it is arranged between second optical sender 201 and the photo-coupler, for transmitting and adjusting from described
The power of the part upward signal of second optical sender 201.
The power of the downstream signal of input photo-coupler can be adjusted by the first optical splitter, the second optical splitter can be adjusted
The power of the upward signal of photo-coupler is inputted, so as to adjust the power of photo-coupler output signal, that is, adjusts the beat frequency of generation
The beat frequency power of noise, operating personnel are facilitated to be arranged as required to beat frequency power needed for oneself.Wherein, the size of beat frequency power with
Wavelength difference between flashlight and continuous light is relevant, and the bigger caused beat frequency noise of wavelength difference is smaller.Generally when tunable optical is sent out
Penetrate machine output wavelength it is consistent with downstream signal optical wavelength when the beat frequency noise power that measures to will be above tunable optical emitter defeated
More than the beat frequency noise power 3dB that the wavelength gone out measures with downstream signal optical wavelength when inconsistent.
As shown in figure 4, down direction network data analyzer MD1230B emission ports TX1 provides for optical line terminal OLT
10G/s rate business signals, it is (i.e. another by optical module 1 (i.e. one group of first optical sender and the first photoreceiver) and optical module 2
One group of first optical sender and the first photoreceiver) carry out wavelength convert after by optical module 2 send wavelength be λ 10Gb/s speed
Downlink business signal, signal pass through the first optical circulator and array waveguide grating (AWG1, i.e. the first OWDM demultiplexing
Device) λ wavelength channels be connected, through 40km optical fiber pass (i.e. feeder fiber) it is defeated after enter array waveguide grating (AWG2, i.e. the second light
Wave division multiplexer/demultiplexer), then by optical module 3 (i.e. one group of second optical sender and the second light-receiving after the second optical circulator
Machine) and optical module 4 (i.e. another group of the second optical sender and the second photoreceiver) complete receive and reception is obtained into downlink business
Signal is passed to network data analyzer MD1230B receiving ports RX1 and carries out Bit Error Ratio Measurement.
As shown in figure 4, up direction network data analyzer MD1230B emission ports TX2 provides for optical network unit ONU
10G/s rate business signals, uplink service signal is modulated to by tunable optical emitter after the opto-electronic conversion of optical module 3, on
Row service signal passes through the second optical circulator and array waveguide grating (AWG2) λ wavelength channels be connected, through 40km optical fiber transmit
Enter array waveguide grating (AWG afterwards1), then after the first optical circulator, adjustable attenuator VOA it is complete by optical module 2 and optical module 1
The network data analyzer MD1230B receiving ports RX2 progress bit error rates are passed into receiving and reception being obtained into uplink service signal
Statistics.
It is tunable in ascending adjustment optical network unit ONU to keep the wavelength of optical line terminal OLT optical module 2 constant
The output wavelength of optical sender, it is other in tunable optical emitter output center wavelength of light dim light 2 output center wavelength difference of module
For 0nm, 0.02nm, 0.04nm, 0.06nm, 0.08nm when, the points of A as shown in Figure 5 that are measured by adjusting adjustable attenuator VOA
Ber curve figure under different luminous powers.Reused it can be seen that can be realized by system proposed by the present invention in upper and lower row of channels
On the basis of up-downgoing wavelength shift to reducing the feasibility and validity of backward Rayleigh scattering.
As shown in Fig. 6 A to Fig. 6 F, the output wavelength of respectively ascending adjustment tunable optical emitter, tunable
Optical sender output center wavelength of light subtract DWDM optical transmitter modules output center wavelength difference be respectively -0.8nm, -0.15nm, -
Corresponding spectrogram when 0.1nm, 0nm, 0.1nm, 0.15nm.
As shown in fig. 7, the beat frequency measured in the case of wavelength difference shown in Fig. 6 A to Fig. 6 F with microwave power meter
Noise power, surveyed when the wavelength difference described in Fig. 6 A to Fig. 6 F is 0nm (i.e. wavelength registration drift amount is 0) as shown in Figure 7
Beat frequency noise power it is maximum, and after the wavelength difference absolute value described in Fig. 5 is more than 0.15nm, particularly greater than 0.4nm is (i.e.
When the output wavelength and DWDM optical transmitter modules output wavelength of tunable optical emitter be not in an ITU 100GHz/50GHz
When in grid), the power measured tends to be minimum.System proposed by the invention is demonstrated by the principle feasibility Experiment to realize
Upper and lower row of channels reuses, the feasibility and validity of up-downgoing wavelength shift.
In the present invention, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint are relative
Importance.Term " multiple " refers to two or more, is limited unless otherwise clear and definite.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
1. a kind of row of channels up and down reuses WDM passive optical network system, it is characterised in that including：Optical line terminal, feedback
Linear light fibre, the second OWDM demultiplexer, branch optical fiber and n optical network unit,
Wherein, the optical line terminal includes：First OWDM demultiplexer, and the photoreceiver of n groups first, the first light
Emitter and the first optical circulator, the first photoreceiver and the first optical sender in every group are connected to by the first optical circulator
The first OWDM demultiplexer, n are the integer more than 1,
The downstream signal of each first optical sender is multiplexed in downlink transmission direction by the first OWDM demultiplexer
Transmitted for signal all the way to the feeder fiber, in uplink direction, the upward signal solution that will be received from the feeder fiber
Each first photoreceiver is transmitted separately to after multiplexing,
The feeder fiber will receive the second OWDM demultiplexer described in the multiplexing downstream signal feed-in received
Multiplexing upward signal feed-in described in the first OWDM demultiplexer,
The second OWDM demultiplexer is transmitted to the branch after FD feed is demultiplexed in downlink transmission direction
Optical fiber, transmitted behind uplink direction, the signal multiplexing that will be received from the branch optical fiber to the feeder fiber,
Each optical network unit includes：Second optical sender, the second photoreceiver, the second optical circulator and control unit, its
In, second photoreceiver is received under the second OWDM demultiplexer by second optical circulator
Row signal, described control unit control second optical sender ground connection, according to the output wavelength of second optical sender and
The beat frequency power of second photoreceiver carries out power analysis and wavelength is set, and is controlled after completing power analysis and wavelength setting
Second optical sender disconnects the connection with ground, and second optical sender is modulated and launched to upward signal,
Wherein, the passband center wavelengths of the first OWDM demultiplexer and the second OWDM demultiplexer are corresponding
Passband center wavelengths it is equal, the operation wavelength of the second optical sender, relative to the second OWDM demultiplexer
Passband center wavelengths offset preset value.
2. row of channels reuses WDM passive optical network system up and down according to claim 1, it is characterised in that described the
The passband center wavelengths of one n wavelength channel of OWDM demultiplexer are respectively λ1、λ2、…、λn, n the first optical circulators
The n wavelength channel with the first OWDM demultiplexer is connected respectively, wherein, the work of first optical sender
Passband center wavelengths in wavelength and the corresponding wavelength channel of the first OWDM demultiplexer are equal.
3. row of channels reuses WDM passive optical network system up and down according to claim 1, it is characterised in that described the
The passband center wavelengths of two n wavelength channels of OWDM demultiplexer are respectively λ1、λ2、…、λn, n the second optical circulators
The n wavelength channel with the second OWDM demultiplexer is connected respectively, wherein, the work of second optical sender
Wavelength offsets default relative to the passband center wavelengths in the corresponding wavelength channel of the second OWDM demultiplexer
Value.
4. row of channels reuses WDM passive optical network system up and down according to claim 1, it is characterised in that described the
Two photoreceivers include：Light receiving element, spectrophotometric unit, photo-coupler, photodetector and reception microwave power meter,
Wherein, the light receiving element receives the downstream signal from second optical circulator, and the spectrophotometric unit, which receives, to be come
From the downstream signal of second optical circulator, the photo-coupler receive the part downstream signal from the spectrophotometric unit with
And the part upward signal from second optical sender, and both are coupled, the signal after coupling is transmitted to institute
Photodetector is stated, the photodetector is used to produce beat frequency noise, and the microwave power meter is made an uproar for detecting the beat frequency
The beat frequency power of sound.
5. row of channels reuses WDM passive optical network system up and down according to claim 4, it is characterised in that the light
The bandwidth of electric explorer is less than 10GHz.
6. row of channels reuses WDM passive optical network system up and down according to claim 4, it is characterised in that described point
Light device includes：
First optical splitter, it is arranged between second optical circulator and the photo-coupler, for transmitting and adjusting from institute
State the power of the part downstream signal of the second optical circulator.
7. row of channels reuses WDM passive optical network system up and down according to claim 6, it is characterised in that described point
Light unit also includes：Second optical splitter, it is arranged between second optical sender and the photo-coupler, for transmitting and adjusting
Save the power of the part upward signal from second optical sender.
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| CN108337066A (en) * | 2017-12-27 | 2018-07-27 | 北京格林威尔科技发展有限公司 | Optic fiber converter and fibre-optic transmission system (FOTS) |
| CN108391186A (en) * | 2018-04-19 | 2018-08-10 | 北京邮电大学 | A kind of reconfigurable optical access net system |
| WO2020069648A1 (en) * | 2018-10-02 | 2020-04-09 | Huawei Technologies Co., Ltd. | Transceiving with a predetermined frequency spacing |
| CN110475165A (en) * | 2019-07-31 | 2019-11-19 | 武汉长光科技有限公司 | A kind of optical network unit for supporting ultra dense wavelength division multiple |
| CN112350779A (en) * | 2019-08-07 | 2021-02-09 | 中国电信股份有限公司 | Wavelength division multiplexing device, fronthaul optical network device, system and operation method |
| CN112511229B (en) * | 2019-09-16 | 2022-08-30 | 中国移动通信有限公司研究院 | Forward transmission network system and optical module |
| CN113473268A (en) * | 2020-03-31 | 2021-10-01 | 华为技术有限公司 | Channel identification method and device based on multiplexing |
| CN114172580B (en) * | 2021-12-22 | 2023-07-25 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing network WDM-PON system based on adjustable ONU and signal propagation method |
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| US8542999B2 (en) * | 2011-02-01 | 2013-09-24 | Vello Systems, Inc. | Minimizing bandwidth narrowing penalties in a wavelength selective switch optical network |
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