CN105516831B - The Raman of optical access network based on microwave photon filtering inhibits system - Google Patents
The Raman of optical access network based on microwave photon filtering inhibits system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
Abstract
The invention discloses a kind of Ramans of optical access network based on microwave photon filtering to inhibit system.The present invention includes optical line terminal, branched system optical fiber, light distant-end node, multiple distribution type fiber-optics and multiple optical network units；Optical line terminal is connected to light distant-end node by branched system optical fiber, and light distant-end node passes through distribution type fiber-optic connecting optical network unit.On the one hand the present invention amplifies the power of downlink signal using cascade semiconductor optical amplifier, on the other hand its high pass attribute in depth zone of saturation is utilized, i.e. microwave photon filters, it realizes the pretreatment to signal low-frequency component, reduces Raman scattering influence of noise of the next-generation optical access network system to existing optical transmission system.The system is not necessarily to additional high speed electric treatment module, realizes the multiple use of single device, lowers system cost to a certain extent.
Description
Technical field
The present invention relates to the communication technology of Optical Access Network necks, connect more particularly to a kind of light based on microwave photon filtering
The Raman of networking inhibits system.
Background technique
With the continuous improvement of social informatization degree, the passback of IPTV, HD video, mobile multimedia, wireless data
With continuing to bring out for the emerging services such as forward pass, demand of the terminal user to access bandwidth is higher and higher.And as " last is public
In " user access networks (wire/wireless) then develop relatively slowly directly affect volume of business that communication network can be provided,
The development and utilization of quality, speed and Internet resources becomes the bottleneck for restricting the whole network development.At the same time, wireless access network
The critical asset that (RAN, Radio access network) depends on for existence as mobile operator, with mobile Internet, object
The rise of networking is faced with unprecedented challenge: 1) side of RAN access capability is promoted by enhancing air interface capability
Formula brings high energy consumption；2) high RAN capital expenditures (CAPEX, Capital Expenditure) and operation cost
(OPEX,Operating Expense)；3) tidal effect of customer service leads to low base station utilization rate；4) access of user
The income amplification of flow and operator is seriously disproportionate.
Wave stack PON technology can be expired using hybrid multiplex technology (WDM and TDM or WDM and Orthogonal OFDM)
Sufficient user is to the target of bandwidth upgrading and network operator's cost of implementation maximum revenue, by International Organization for standardization's U.S. electric
With Electronic Engineering Association (IEEE) and ITU Telecommunication Standardization Sector/full service access network forum (ITU-T/
FSAN) it is selected as next-generation PON major technique direction.Wave stack PON system is as existing PON system, different PON subsystems
Internal handling capacity greatly changes with the characteristic variations of user, and " tide is existing as the characteristic of user group shows
As ", this reduces network resource utilization to a certain extent.Meanwhile being counted according to NTT, from the point of view of whole network development trend, PON
System user has approached to saturation, and future development needs more new business and is based on wave stack mode integrated system.Therefore, in wave
On the long framework for stacking PON system, realize that the Full-Services access such as family, enterprise, wireless are one of main flow directions of its development.
However, in systems in practice, the downlink transfer of access net is merged with light based on the wireless forward pass of wave stack PON,
When for example CATV coexists with traditional PON business, system descending signal brings Raman scattering that will have an impact to CATV signal.Together
When, in order to not influence the transmission performance of traditional passive optical-fiber network, the compatibility feature with laying passive optical network in the past is kept, it is next
Wavelength O wave band (O-band), the S- wave band (S-band), C-band (C- in former passive optical network cannot be reused for PON
Band it) has all been dispensed with most of wavelength resource in L-band (L-band).Next-generation light is connect with wireless mix
For signal in networking, downstream wavelength is arranged at the wavelength being also not used by C-band and L-band thereon.When entering fine light
When power is larger, the nonlinear effect of optical fiber will will lead to the mutual shadow between the wavelength in light and wireless mixed transport network
It rings, the stimulated raman scattering (SRS, Stimulated Raman Scattering) especially in optical fiber, it can be to corresponding
Power and signal on wavelength causes bad influence.
Premenstruum (premenstrua) literature survey is it is found that the researcher world optical fiber of limited liability company, Huawei believes meeting (Optical
Fiber Communication Conference, OFC) on delivered " the delayed modulation technology in TWDM-PON system "
(Delay Modulation for TWDM PONs) is lowered by electrical domain coding and stacks drawing present in TDM-PON system
Influence of the graceful effect to RF-Video signal wavelength.Though the program can effectively solve Ramam effect, the electric appliance of high speed is needed
Part carries out encoding and decoding, increases the cost of system to a certain extent；And delay modulation changes turning over for bit in data flow " 1 "
Indexing is set, to carry out needing to modify to demodulator circuit in demodulating process to adapt to the letter of delay modulation to it in receiving end
Number characteristic.
Again through literature survey it is found that the U.S. NEC experiment researcher delivered on OFC " towards next-generation PON with
The 10Gb/s system that CATV coexists is more than 5dB Raman scattering noise suppressed based on PSD control " (" Beyond 5dB
Nonlinear Raman Crosstalk Reduction via PSD Control of 10Gb/s OOK in RF-Video
Coexistence Scenarios for Next-Generation PON), which is mainly filtered using simple electrical domain
Method solves the influence as brought by excited Raman between TWDM-PON and RF-video, although the program can be certain
Raman scattering effect is able to suppress in degree, but the program is using the receiving sensitivity of sacrificial system as cost.
Summary of the invention
The purpose of the invention patent is mentioned aiming at the problem that Raman scattering noise suppression proposal in existing access net system
Inhibit system for a kind of Raman of the optical access network based on microwave photon filtering of full light.Downlink optical signal injection of the present invention
Before optical fiber, a microwave photon filter is first passed through to realize the predistortion of optical signal, to realize that reduction stacks PON system list
Raman scattering effect of the member to existed system unit.Structure of the invention is implemented simple, it is only necessary to add one at optical line terminal (OLT)
A cascaded semiconductor image intensifer (SOA) or reflective semiconductor optical amplifier (RSOA), can be realized putting for downlink signal
Big and pretreatment；And it does not need to do any processing in the electrical domain of system structure.
The technical solution adopted by the present invention to solve the technical problems is as follows:
The Raman of optical access network based on microwave photon filtering inhibits system, including optical line terminal, branched system optical fiber, light
Distant-end node, multiple distribution type fiber-optics and multiple optical network units.Wherein, optical line terminal is connected to by branched system optical fiber
Light distant-end node, light distant-end node connect each optical network unit by distribution type fiber-optic.
Optical line terminal includes the data signal transmission module of several multiple downlinks, several multiple upstream data signals data
Receiving module, wave multiplexer, channel-splitting filter and the cascaded semiconductor image intensifer based on SOA/RSOA, in which: multiple downlink data letters
The input terminal that number transmitting module is connected to wave multiplexer with downlink data transmitting module is connect, and the output end of wave multiplexer is connected to
1st port of one optical circulator, the 2nd port connection cascaded semiconductor image intensifer of the first optical circulator is to realize downlink data
Predistortion and amplification；The connection of the output end of the multiple upstream data signals receiving modules of upstream data receiving module and channel-splitting filter connects
It connects, the input terminal of channel-splitting filter is connected to the 3rd port of the first optical circulator, the 2nd port connection cascade half of the first optical circulator
The reception of conductor image intensifer realization upstream data；
Optical network unit includes optic tunable filter, the second optical circulator, photodetector and upstream data signals transmitting
Machine, one end of optic tunable filter connect the second the 2nd port for connecing optical circulator, connect after the 3rd port output of the second optical circulator
Photodetector is connect, to complete the demodulation of downlink signal；Upstream data signals transmitter is real by the 1st port of optical circulator
The transmitting of existing upstream data.
Preferably, downlink data signal transmitting module is divided into external modulation and directly two kinds of forms of modulation according to modulation format:
1) external modulation transmitting module includes: downlink continuous light source CW, external modulator and downlink data signal.The continuous light of downlink
Source CW is connected to external modulator as downlink light carrier, and downlink data signal, by bias voltage, makes for driving external modulator
External modulator works in the linear zone of its transmission curve, and then realizes the transmitting of downlink data.
Wherein, downlink continuous light source CW is the vertical-cavity surface-emitting of distribution bragg reaction type Distributed Feedback Laser or Single wavelength
The CW light source such as laser；External modulator is the external modulator that Mach increases the high-speeds such as Dare modulation or electroluminescent Absorption modulation device；
2) directly modulate emission module includes: direct modulation laser, row data-signal and biasing circuit, and directly modulation swashs
Light device is connect with biasing circuit and row data-signal respectively, and downlink signal is modulated on light carrier by realization, in which: passes through biasing
Circuit makes directly to modulate laser works in the linear zone of its transmission curve, and then realizes downlink overloading based on wave filter group
The transmitting of wave modulation data.
Wherein, directly modulation laser be chirp management direct modulation laser (CML) perhaps Distributed Feedback Laser or
VCSEL laser or distributed Bragg reflection laser (Distributed Bragg Reflector laser, DBR) etc.
Directly modulate laser etc.；
Preferably, the wave multiplexer and channel-splitting filter in optical line terminal is array waveguide grating or other passive/active waves
Divide multiplexing reconciliation multiplexing device；
Preferably, optical line terminal cascade semiconductor optical amplifier is SOA or RSOA；
It is preferably based on the cascaded semiconductor image intensifer of SOA/RSOA, is made of amplifier and corresponding biasing circuit,
Biasing circuit is used to control the working condition of SOA/RSOA cascade image intensifer, makes its work in depth saturation state, thus together
The predistortion and amplification of Shi Shixian downlink signal；
Preferably, optic tunable filter is selected for the wavestrip of downlink signal；
Preferably, distant-end node can be 1:N optical branching/combiner or light wave multiplexer, be mainly used for will under
Row signal is distributed to each optical network unit being attached thereto by distribution type fiber-optic；Meanwhile the difference of different optical network units
The upstream data of wavelength is coupled by distribution type fiber-optic by combiner, and the upstream data after coupling is uploaded to by branched system optical fiber
Optical line terminal is handled.
Preferably, above-mentioned N takes 64,128,256 or 512.
Preferably, downlink data signal transmitting module is M, and M takes 4,8 or 10.
Preferably, row photodetectors can be PIN or APD.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention will be designed based on semiconductor optical amplifier cascode device and adjust this at the end OLT, and by biasing circuit
Cascode device makes its work in depth saturation state, can on the one hand be carried out using the self character of image intensifer to downlink signal
Amplification is to improve the incident optical power of downlink signal；On the other hand, cascade SOA/RSOA work is made full use of to be saturated in depth
There is high pass characteristic when state, that is, realize the function of microwave photon filter, to realize the processing downlink data letter of its full light
Number, its part low frequency cost is filtered, to effectively realize next-generation stacking PON bring Raman scattering in real net system.
The system structure is simple, it is easy to accomplish, realize that amplification and microwave photon filter action are realized simultaneously using cascade SOA/RSOA
A kind of multiple use of device and then reduce system cost；Simultaneously, it is only necessary to be handled on light and electrical domain does not need to do any high speed electricity
Processing, which achieves that, stacks PON system bring Raman scattering noise to existing or Future Access Network system influence.
Detailed description of the invention
Fig. 1 is that the Raman of the optical access network based on microwave photon filtering in the invention patent inhibits system construction drawing；
Fig. 2 is the structure principle chart of the downlink module in the invention patent, and the transmitting module of (a) external modulation is (b) straight
Connect modulation module；
Schematic illustration of the Fig. 3 based on cascade SOA/RSOA work under depth saturation state.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The present invention is directed to based in existing optical access network system, implementing Next Generation Access system and bring Raman scattering
Problem designs the system structure of the inhibition of the Raman scattering noise of the microwave photon filter based on cascade SOA/RSOA.
As shown in Figure 1, the present embodiment includes: optical line terminal, branched system optical fiber, light distant-end node, multiple distributed light
Fine and multiple optical network units.Wherein, optical line terminal is connected to light distant-end node, light distant-end node by branched system optical fiber
Each optical network unit is connected by distribution type fiber-optic, specific: optical line terminal is connected with one end of branched system optical fiber, branched system
The other end of optical fiber connects light distant-end node, light distant-end node be 1:N optical branching/combiner (N takes 64,128,256 or 512) or
For N-port wavelength division multiplex device (N takes 64,128,256 or 512, the wavelength division multiplex device can for array waveguide grating or
Cyclic array waveguide raster), optical branching/combiner (Splitter) or wavelength division multiplexer pass through distribution type fiber-optic connection light net
Network unit 1, optical network unit 2 ..., optical network unit N.Specifically, N value depends on the splitting ratio of optical branching combiner, and N can
Take 64,128,256 or 512.
Optical line terminal include the data signal transmission module of M downlink, M upstream data signals data reception module,
Wave multiplexer, channel-splitting filter and cascaded semiconductor image intensifer, in which: M downlink data signal transmitting module is sent out with downlink data
The input terminal connection that module is connected to wave multiplexer is penetrated, the output end of wave multiplexer is connected to the 1st port of the first optical circulator, and first
2nd port of optical circulator connects cascaded semiconductor image intensifer to realize the predistortion and amplification of downlink data；Upstream data
The connection connection of the output end of the multiple upstream data signals receiving modules of receiving module and channel-splitting filter, the input terminal of channel-splitting filter are connected to
The 2nd port connection cascaded semiconductor image intensifer of 3rd port of the first optical circulator, the first optical circulator realizes upstream data
Reception；Specific M value depends on the downstream rate in the PON system of upgrading, M desirable 4,8 or 10 etc..
Downlink data signal transmitting module generates the road M (M=4 or 8 or 10) and is modulated at the downlink signal on different wave length,
After wave multiplexer, passed by the first optical circulator by being input to branched system optical fiber after the amplification of cascaded semiconductor image intensifer
It is defeated.
Further, the structure of downlink data signal transmitting module such as Fig. 2 (a) and (b) are shown, wherein Fig. 2 (a), downlink
Data signal transmission module includes downlink continuous light source CW, external modulator and downlink data signal.The CW connection of downlink continuous light source
To external modulator as downlink light carrier, downlink data signal, by bias voltage, makes external modulator for driving external modulator
It works in the linear zone of its transmission curve, and then realizes the transmitting of downlink data.In Fig. 2 (b), downlink data signal transmitting module
Including directly modulating laser, row data-signal and biasing circuit, directly modulation laser respectively with biasing circuit and row data
Downlink signal is modulated on light carrier by signal connection, realization, in which: by biasing circuit, makes directly to modulate laser works
In the linear zone of its transmission curve, and then realize the transmitting of downlink multi-carrier modulation data based on wave filter group.
Optical branching/the combiner or wavelength division multiplexer of distant-end node are to pass through distribution type fiber-optic for downlink data signal
It is distributed to each optical network unit being attached thereto；Meanwhile the upstream data of the different wave length of different optical network units is by dividing
Cloth optical fiber is coupled by combiner or wavelength division multiplexer, and the upstream data after coupling uploads to optical link by branched system optical fiber
Terminal is handled.
Again as shown in Figure 1, optical network unit includes optic tunable filter, the second optical circulator, photodetector and uplink
Data signal transmitter, one end of optic tunable filter connect the second the 2nd port for connecing optical circulator, and the 3rd of the second optical circulator the
Photodetector is connected after the output of port, to complete the demodulation of downlink signal；The output of upstream data signals transmitter connects
To the 1st port of optical circulator, the transmitting of upstream data is realized by the 1st port of optical circulator, passes through the 2nd end of optical circulator
Mouth enters optic tunable filter and then realizes the output of upstream data.
Wherein, in PON system, tunable filter to stack PON WDM-PON system be it is existing, to TDM-PON
It is not present.
Downlink data signal receiving module is made of PD and tunable optical filter；Tunable optical filter is used for down going wave device group
Multi-carrier modulation data-signal selection.After downlink data signal reaches optical network unit by distribution type fiber-optic, pass through
Tunable optical filter and the selection for realizing downlink signal reach downlink data receiving module, Jin Ershi via the second optical circulator
The detection of existing downlink signal.
Cascaded semiconductor image intensifer based on SOA/RSOA, is mainly made of amplifier and corresponding biasing circuit,
Biasing circuit is mainly used for controlling the working condition of SOA/RSOA cascade image intensifer, makes its work in depth saturation state, from
And the predistortion and amplification of downlink signal are realized simultaneously；Its structure for cascading SOA/RSOA image intensifer and working condition signal are such as
Shown in Fig. 3.
The present embodiment is in the Transmission system of next-generation wave stack passive optical network using based on photon microwave filtering skill
Art has the advantage that
1) system structure should be inhibited based on the Raman of the access net of photon microwave filtering, and utilized the self character of image intensifer
Downlink signal is amplified to improve the incident optical power of downlink signal, does not change existing wave stack PON system and mentions
The transmitting power reponse (projector power response) that downlink signal is improved using amplifier out；
2) make full use of cascade SOA/RSOA work that there is high pass characteristic, i.e. realization microwave photon in depth saturation state
The function of filter filters its part low frequency cost to realize the processing downlink data signal of its full light, thus effective real
Now a generation stacks PON bring Raman scattering in real net system.
3) system structure is simple, it is easy to accomplish, realize that amplification and microwave photon filter simultaneously using cascade SOA/RSOA
Effect realizes a kind of multiple use of device and then reduces system cost；Simultaneously, it is only necessary to be handled on light and electrical domain does not need to do
Any high speed electric treatment, which achieves that, stacks PON system bring Raman scattering noise to existing or Future Access Network system
It influences.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (5)
1. the Raman of the optical access network based on microwave photon filtering inhibits system, it is characterised in that including optical line terminal, feeder line
Formula optical fiber, light distant-end node, multiple distribution type fiber-optics and multiple optical network units；Optical line terminal is connected by branched system optical fiber
It is connected to light distant-end node, light distant-end node passes through distribution type fiber-optic connecting optical network unit；
Optical line terminal include the data signal transmission modules of multiple downlinks, multiple upstream data signals receiving modules, wave multiplexer,
Channel-splitting filter and cascaded semiconductor image intensifer, in which: multiple downlink data signal transmitting modules are connected to the input terminal of wave multiplexer,
The output end of wave multiplexer is connected to the 1st port of the first optical circulator, and the 2nd port of the first optical circulator connects cascaded semiconductor
Image intensifer is to realize the predistortion and amplification of downlink data；The output end of multiple upstream data signals receiving modules and channel-splitting filter
Connection, the input terminal of channel-splitting filter are connected to the 3rd port of the first optical circulator, and the 2nd port of the first optical circulator connects cascade
The reception of semiconductor optical amplifier realization upstream data；
By cascaded semiconductor optical amplifier design at the end OLT, and the cascaded semiconductor image intensifer is adjusted by biasing circuit
Make its work in depth saturation state, make full use of cascade SOA/RSOA work that there is high pass characteristic in depth saturation state,
The function of microwave photon filter is realized, to effectively realize next-generation stacking PON bring Raman in real net system
Scattering；
Optical network unit includes optic tunable filter, the second optical circulator, photodetector and upstream data signals transmitter, light
One end of tunable filter connects the second the 2nd port for connecing optical circulator, connects photoelectricity after the 3rd port output of the second optical circulator
Detector, to complete the demodulation of downlink signal；Upstream data signals transmitter realizes uplink by the 1st port of optical circulator
The transmitting of data；
Downlink data signal transmitting module is divided into external modulation and directly two kinds of forms of modulation according to modulation format:
Downlink data signal transmitting module be external modulation emit form when, specifically include downlink continuous light source CW, external modulator and
Downlink data signal；Downlink continuous light source CW is connected to external modulator as downlink light carrier, and downlink data signal is for driving
External modulator makes external modulator work in the linear zone of its transmission curve by bias voltage, and then realizes the hair of downlink data
It penetrates；Wherein, downlink continuous light source CW is the vertical cavity surface-emitting laser of distribution bragg reaction type Distributed Feedback Laser or Single wavelength
Device；External modulator is that Mach increases Dare modulator or electroluminescent Absorption modulation device；
Downlink data signal transmitting module be direct modulate emission form when, specifically include directly modulation laser, line number it is believed that
Number and biasing circuit, directly modulation laser connect respectively with biasing circuit and row data-signal, realize downlink signal is modulated
On light carrier, in which: by biasing circuit, make directly to modulate linear zone of the laser works in its transmission curve, Jin Ershi
Now go the transmittings of multi-carrier modulation data based on wave filter group；Wherein, directly modulation laser is the direct of chirp management
Modulate laser or Distributed Feedback Laser or VCSEL laser or distributed Bragg reflection laser.
2. the Raman of the optical access network according to claim 1 based on microwave photon filtering inhibits system, it is characterised in that
Wave multiplexer and channel-splitting filter in optical line terminal are array waveguide grating or other passive/active wavelength-division multiplex and demultiplexing
Device.
3. the Raman of the optical access network according to claim 2 based on microwave photon filtering inhibits system, feature is in light
Line terminal cascade semiconductor optical amplifier is SOA or RSOA.
4. the Raman of the optical access network according to claim 3 based on microwave photon filtering inhibits system, it is characterised in that
Light distant-end node is the optical branching/combiner or light wave multiplexer of 1:N, and N takes 64,128,256 or 512.
5. the Raman of the optical access network according to claim 4 based on microwave photon filtering inhibits system, it is characterised in that
Downlink data signal transmitting module is M, and M takes 4,8 or 10.
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| CN114173226B (en) * | 2021-11-09 | 2023-12-22 | 武汉邮电科学研究院有限公司 | Novel passive optical network system based on distributed Raman optical amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102823160A (en) * | 2009-10-30 | 2012-12-12 | 班戈大学 | Use of the same set of wavelengths for uplink and downlink signal transmission |
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