CN102231035B - All optical wavelength converter and all optical wavelength conversion method for dual-semiconductor optical amplifier structure - Google Patents
All optical wavelength converter and all optical wavelength conversion method for dual-semiconductor optical amplifier structure Download PDFInfo
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Abstract
The invention provides an all optical wavelength converter and all optical wavelength conversion method for a dual-semiconductor optical amplifier structure and relates to a hybrid wavelength division time division multiplex passive optical network system. A downlink signal light can be divided into two paths through a 1:2 optical splitter, i.e., one path of light is compensated by an erbium-doped fiber amplifier (EDFA), combined by a wavelength division multiplexer and then sent to a user terminal; the other path of light successively passes through the EDFA, a first semiconductor optical amplifier and an adjustable optical attenuator and then is used for the probe light input of a cross-gain modulation structure; after being divided by the wavelength division multiplexer, an uplink signal light is successively connected with the EDFA, the adjustable optical attenuator and a polarization controller and is used for the pump light input of the cross-gain modulation structure; and the probe light and the pump light can be input into an optical coupler, converted through a second semiconductor optical amplifier and a band pass filter and then output. The all optical wavelength converter and the all optical wavelength conversion method are in accordance with the optical passive and colorless requirements; and meanwhile, the all optical wavelength converter has a simple system structure, thus reducing the operation and maintenance costs of the system and being beneficial to the application and later maintenance for large-scale projects.
Description
Technical field
The utility model relates to the hybrid wavelength-division and time-division multiplexing passive optical network system, is specifically All Optical Wave Converter and the conversion method of a kind of pair of semiconductor optical amplifier structure.
Background technology
" light entering and copper back " has been the trend of the times of access layer network future development, and band optical fiber is progressively replacing to the family technology first-selection that various traditional narrow copper cable access technologies become the fixed network operator.And EPON (Passive Optical Network, PON) is shown one's talent from multiple optical fiber access technology with advantages such as the large capacity, full-service, low cost of himself, highly reliable, easy cares.The passive optical network technique of existing main flow is divided into two kinds of Wave division multiplexing passive optical network (WDM-PON) and time division multiplex EPONs (TDM-PON), and it cuts both ways.Thereby merge WDM-PON and two kinds of passive optical network technique of TDM-PON, and learn from other's strong points to offset one's weaknesses, become the development trend of PON network of future generation.
The hybrid wavelength-division and time-division multiplexing passive optical network system is in fact take the TDM-PON technology as the basis, at its a plurality of optical line terminals (Optical Line Terminal, OLT) and optical network unit (Optical Network Unit, ONU) insert wavelength-division multiplex and All Optical Wave Converter (the All-Optical Wavelength Converter of WDM-PON between, AOWC), utilize wavelength-division multiplex to realize the access dilatation of simple optical fiber, utilize All Optical Wavelength Conversion to realize being connected of WDM-PON and TDM-PON system.The various optical non-linear effects of many based semiconductors of All Optical Wave Converter image intensifer (Semiconductor Optical Amplifer, SOA) of research, mainly comprise XGM, Cross-phase Modulation and four-wave mixing at present.
Various nonlinear effects based on SOA all need the direct current light of a branch of specific wavelength as the detection light of wavelength conversion, and supplying with at present the mode of surveying light in the hybrid wavelength-division and time-division multiplexing passive optical network system has two kinds.A kind of is in far-end All Optical Wavelength Conversion inside modules, use specific wavelength to survey light laser, because its Wavelength-converting is corresponding one by one with laser wavelength, thereby need produces and safeguard and the All Optical Wavelength Conversion module of different wave length model be unfavorable for large-scale engineering applications and later stage system maintenance.Another kind is to adopt multi-wavelength to survey radiant at local side, seed light remotely pumping far-end All Optical Wavelength Conversion module is provided, effectively avoided the All Optical Wavelength Conversion inside modules to use wavelength specific laser although adopt this kind mode, but it need to increase expensive multi wave length illuminating source and at optical distribution network (Optical Distribution Network at local side, ODN) increase multichannel seed light wavelength channel in, system architecture is comparatively complicated.
Summary of the invention
For the defective that exists in prior art, the object of the present invention is to provide All Optical Wave Converter and the conversion method of a kind of pair of semiconductor optical amplifier structure, meet " light is passive " and " decolorizable " requirement, the system architecture advantages of simple, reduction system operation maintenance cost is beneficial to large-scale engineering applications and later stage system maintenance.
the All Optical Wave Converter of a kind of pair of semiconductor optical amplifier structure, comprise the 1:2 optical branching device that receives downgoing signal light, the wavelength division multiplexer that is connected with the user side light path, two adjustable optical attenuators, two photo-couplers that the common light path of adjustable optical attenuator connects, two adjustable optical attenuators are connected with the wavelength division multiplexer light path with the 1:2 optical branching device respectively, the 1:2 optical branching device and with adjustable optical attenuator that its light path is connected between be connected to the first semiconductor optical amplifier, be connected to Polarization Controller between another adjustable optical attenuator and photo-coupler, photo-coupler light path successively connects the second semiconductor optical amplifier and bandpass filter.
On the basis of technique scheme, between described 1:2 optical branching device and wavelength division multiplexer, between described 1:2 optical branching device and the first semiconductor optical amplifier, between described wavelength division multiplexer and adjustable optical attenuator, all be provided with Erbium-Doped Fiber Amplifier (EDFA).
On the basis of technique scheme, described photo-coupler, the second semiconductor optical amplifier and bandpass filter consist of the XGM structure.
On the basis of technique scheme, described wavelength division multiplexer is three port filter plate type Coarse Wave Division Multiplexers.
The present invention also provides the All Optical Wavelength Conversion method of a kind of pair of semiconductor optical amplifier structure, comprise 1:2 optical branching device, wavelength division multiplexer, the first semiconductor optical amplifier and the second semiconductor optical amplifier, downgoing signal light is divided into two-way via the 1:2 optical branching device, one road light exports user side to after closing ripple via wavelength division multiplexer after Erbium-Doped Fiber Amplifier (EDFA) compensation; Another road light is used for the detection light input of XGM structure successively via Erbium-Doped Fiber Amplifier (EDFA), the first semiconductor optical amplifier and adjustable optical attenuator; Upward signal light via described wavelength division multiplexer partial wave after, connect successively Erbium-Doped Fiber Amplifier (EDFA), adjustable optical attenuator and Polarization Controller, be used for the pump light input of XGM structure; Described detection light and pump light input photo-coupler are by output after the second semiconductor optical amplifier and bandpass filter conversion.
On the basis of technique scheme, described another Lu Guangxian carries out power amplification by Erbium-Doped Fiber Amplifier (EDFA), make it work in the degree of depth saturation region of the first semiconductor optical amplifier, the modulation intelligence that carries on it is thoroughly wiped, become the direct current signal light of power invariability, then regulate its performance number via adjustable optical attenuator.
On the basis of technique scheme, described upward signal light first passes through the wavelength division multiplexer partial wave, then regulates its performance number through Erbium-Doped Fiber Amplifier (EDFA) and adjustable optical attenuator respectively, and regulates its polarization state by Polarization Controller.
On the basis of technique scheme, described the second semiconductor optical amplifier is synchronously transferred to the data message in pump light and is surveyed on light, through bandpass filter filtering pump light frequency component, the detection light frequency component of output carries the data message opposite with up pump signal light amplitude, and the information that realizes is from pump light to the transfer of surveying on light.
Beneficial effect of the present invention is: the first semiconductor optical amplifier is wiped the Data Modulation information of carrying on downgoing signal light in the hybrid wavelength-division and time-division multiplexing passive optical network system, the direct current that is used for All Optical Wavelength Conversion is surveyed light, compare with the existing two kinds methods of supplying with detection light, the All Optical Wave Converter of of the present invention pair of semiconductor optical amplifier structure and conversion method, has " light is passive " and " decolorizable " characteristic, and need not the long-range supply seed light of local side, make network structure further simplify, guarantee cheap operation maintenance cost.
Description of drawings
Fig. 1 is hybrid wavelength-division and time-division multiplexing passive optical network system structured flowchart;
Fig. 2 is the structured flowchart of ODN in Fig. 1;
Fig. 3 is the structured flowchart of the AOWC of the two semiconductor optical amplifier structures of the present invention;
Fig. 4 is the principle of work schematic diagram of the first semiconductor optical amplifier;
Fig. 5 is the second semiconductor optical amplifier gain saturation characteristic curve map.
Reference numeral: local side wavelength division multiplexer 201, far-end wavelength division multiplexer 202, luminous power splitter 204,1:2 optical branching device 301, Erbium-Doped Fiber Amplifier (EDFA) (302,304,307), wavelength division multiplexer 303, the first semiconductor optical amplifiers 305 (SOA1), adjustable optical attenuator (306,308), Polarization Controller 309, photo-coupler 310, the second semiconductor optical amplifiers 311 (SOA2), bandpass filter 312.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, be hybrid wavelength-division and time-division multiplexing passive optical network system structured flowchart.Networks converge point/central machine room is placed the OLT local side of a plurality of TDM-PON, and the downlink data in this equipment adopts the specific wavelength optical modulation, exports different optical wavelength (λ
1, λ
2... λ
n-1, λ
n), to distinguish each OLT, the downgoing signal light of different wave length OLT is through transmission downwards in WDM repeated use of device to an optical fiber.Distant-end node at optical link uses WDM device demultiplexing to go out each branch road optical wavelength signal (λ equally
1, λ
2... λ
n-1, λ
n), then be sent to each ONU through the luminous power splitter respectively.For each ONU time-division slot (TS
1... TS
32) the upstream data wavelength λ that sends
upSignal, process luminous-power distributor convert the upwards transmission of specific wavelength of light signal to after converging to AOWC, then utilize WDM device demultiplexing by local side, deliver to respectively each OLT of TDM-PON corresponding to different wave length.Realized the fusion of traditional TDM-PON and WDM-PON technology with this.
As shown in Figure 2, ODN is as the important component part of hybrid wavelength-division and time-division multiplexing passive optical network system, for providing optical transmission physical channel between local network element OLT and terminal device ONU.Described ODN comprises local side wavelength division multiplexer 201, far-end wavelength division multiplexer 202, AOWC (1...n) and luminous power splitter 204.Wavelength-division multiplex adopts two fine one-way transmission modes, utilizes local side wavelength division multiplexer 201 to close ripple, and far-end wavelength division multiplexer 202 carries out partial wave, avoids the mutual interference of bidirectional data communication phase.AOWC (1...n) transparent transmission downlink data λ
x(x=1,2 ... n), and with the unified λ that sends of each ONU
upWavelength signals light is converted to and the descending light wavelength lambda of this branch road
x(x=1,2 ... n) identical upward signal light, i.e. the signal light wavelength of descending input and upper line output AOWC is identical.1: 32 branching ratio of the maximum support of luminous power splitter in this real-time example.
As shown in Figure 3, the AOWC of described pair of semiconductor optical amplifier structure is the key network element equipment in ODN.The All Optical Wave Converter of described pair of semiconductor optical amplifier structure comprises 1:2 optical branching device 301, the wavelength division multiplexer 303 that is connected with the user side light path, two adjustable optical attenuators, three Erbium-Doped Fiber Amplifier (EDFA)s (EDFA), the first semiconductor optical amplifier 305 (SOA1), the second semiconductor optical amplifier 311 (SOA2), a Polarization Controller 309, a photo-coupler 310 and bandpass filter 312 that receive downgoing signal light.In the present embodiment, 1:2 optical branching device 301 light path respectively connects EDFA302 and EDFA304, and the EDFA302 light path connects wavelength division multiplexer 303 (being three port filter plate type Coarse Wave Division Multiplexers 303 in the present embodiment); EDFA304 light path successively connects SOA1 and adjustable optical attenuator 306.Described three port filter plate type Coarse Wave Division Multiplexers 303 also are connected with the EDFA307 light path, EDFA307 light path successively connects adjustable optical attenuator 308 and Polarization Controller 309, Polarization Controller 309 and adjustable optical attenuator 306 are connected to SOA2 by photo-coupler 310 jointly, SOA2 light path connecting band bandpass filter 312.
As shown in Figure 3, the All Optical Wavelength Conversion method of two semiconductor optical amplifier structures comprises:
Down direction, the C-band wavelength that is input in All Optical Wave Converter is λ
x(x=1,2 ... downgoing signal light n) is divided into two-way through 1:2 optical branching device 301.Wherein one road light is used for normal data downstream, first by EDFA302 power back-off, then exports after closing ripple through three port filter plate type Coarse Wave Division Multiplexers 303, and ONU receives by user side.Other one road light also first carries out power amplification by EDFA304, make it work in the degree of depth saturation region of semiconductor optical amplifier SOA1, the modulation intelligence that carries on it is thoroughly wiped, become the direct current signal light of power invariability, then regulate its performance number via adjustable optical attenuator 306, be used at last the detectable signal light of XGM.
Up direction, the wavelength that a plurality of ONU send is all λ
upUpward signal light at first through three port filter plate type Coarse Wave Division Multiplexer 303 partial waves, then regulate its performance number through EDFA307 and adjustable optical attenuator 308 respectively, and regulate its polarization state by Polarization Controller 309, last pump signal light as XGM, and the input that is coupled together with detectable signal light has in the SOA2 of gain saturation characteristic.In the XGM process of carrying out on SOA2, wavelength is λ
upPump light consumed its a large amount of charge carriers, make SOA2 be operated in the gain saturation state, meanwhile, wavelength is λ
xThe data message that carried on pump light of detection light modulate, be about to data message in pump light and synchronously transfer to and survey light and come up.Be λ finally by crossing centre wavelength
xBandpass filter 312 filtering pump light frequency components, the detection light frequency component of output carries the data message opposite with up pump signal light amplitude, thus the information that realizes is from λ
upWavelength light to the descending smooth λ of this branch road
xTransfer on co-wavelength light.
As shown in Figure 4, the curve in figure has reflected output signal strength and the input signal strength funtcional relationship between the two of SOA1.SOA1-the three dB bandwidth value is less, and during less than-three dB bandwidth value, SOA1 is in the linear workspace of amplifying when the input optical power value, and the value of Output optical power increases along with the value of input optical power is linear; And when the input optical power value during greater than-three dB bandwidth value, SOA1 is in the gain saturation workspace, and the value of Output optical power no longer increases and increases along with the value of input optical power, reaches the duty of gain saturation.The present invention utilizes the gain saturation characteristic of SOA1 to wipe downgoing signal light λ
xUpper entrained data message, make the direct current light that changes a branch of power invariability with the downgoing signal light of modulation intelligence into, the detection light as XGM after the adjustable optical attenuator power attenuation uses.As can be seen from Figure 4, after amplifying through SOA1 front end EDFA, with the downgoing signal light λ of data message
xLevel "0" and the performance number of level"1", all considerably beyond SOA1-the three dB bandwidth value, SOA1 is in the saturated duty of the degree of depth at this moment, make output light in logic level " 0 " and " 1 " corresponding performance number difference very little, output light is close to the direct current light of a branch of power invariability, and in input light, entrained data message is wiped fully.
As shown in Figure 5, be output gain signal and the input signal strength relation between the two of SOA2.Its-input optical power Pin=0dBm corresponding to three dB bandwidth place, output saturation luminous power Psat=13dBm, yield value Gs=27dB.When input optical power Pin＜0dBm, SOA2 gain G s＞27dB; And when input optical power Pin＞0dBm and lasting the increase, the SOA2 gain can sharply descend.And utilize the gain saturation characteristic work of SOA2 based on the All Optical Wave Converter of cross-gain modulation.Pump light and detection light with data message are inputted from the end of SOA2 simultaneously, and when pump light was " 0 ", the yield value of SOA2 was higher, survey light and obtain higher gain, through being output as " 1 " after bandpass filter filtering pump light spectrum component; Otherwise when pump light was " 1 ", the SOA2 yield value was less, and the gain of surveying the light acquisition is lower, surveyed light after filtering pump light spectrum component and was output as " 0 ".As seen, the detection light amplitude of output is just in time opposite with the pump signal light amplitude of input after the conversion of XGM type All Optical Wave Converter.Due to pump signal luminous power in input XGM type wavelength shifter much larger than detection of optical power, so can ignore on the impact that pump light produces by surveying the change in gain that light causes.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, within these improvements and modifications also are considered as protection scope of the present invention.The content that is not described in detail in this instructions belongs to the known prior art of this area professional and technical personnel.
Claims (7)
1. the All Optical Wave Converter of two semiconductor optical amplifier structures, comprise 1: 2 optical branching device that receives downgoing signal light, the wavelength division multiplexer that is connected with the user side light path, two adjustable optical attenuators, two photo-couplers that the common light path of adjustable optical attenuator connects, it is characterized in that: two adjustable optical attenuators are connected with the wavelength division multiplexer light path with 1: 2 optical branching device respectively, 1: 2 optical branching device and with adjustable optical attenuator that its light path is connected between be connected to the first semiconductor optical amplifier, be connected to Polarization Controller between another adjustable optical attenuator and photo-coupler, photo-coupler light path successively connects the second semiconductor optical amplifier and bandpass filter, between described 1: 2 optical branching device and wavelength division multiplexer, between described 1: 2 optical branching device and the first semiconductor optical amplifier, between described wavelength division multiplexer and adjustable optical attenuator, all be provided with Erbium-Doped Fiber Amplifier (EDFA).
2. the All Optical Wave Converter of as claimed in claim 1 pair of semiconductor optical amplifier structure, is characterized in that: described photo-coupler, the second semiconductor optical amplifier and bandpass filter formation XGM structure.
3. the All Optical Wave Converter of as claimed in claim 1 pair of semiconductor optical amplifier structure, it is characterized in that: described wavelength division multiplexer is three port filter plate type Coarse Wave Division Multiplexers.
4. the All Optical Wavelength Conversion method of two semiconductor optical amplifier structures, comprise 1: 2 optical branching device, wavelength division multiplexer, the first semiconductor optical amplifier and the second semiconductor optical amplifier, it is characterized in that:
Downgoing signal light is divided into two-way via 1: 2 optical branching device, and one road light exports user side to after closing ripple via wavelength division multiplexer after the first Erbium-Doped Fiber Amplifier (EDFA) compensation; Another road light is used for the detection light input of XGM structure successively via the second Erbium-Doped Fiber Amplifier (EDFA), the first semiconductor optical amplifier and the first adjustable optical attenuator;
Upward signal light via described wavelength division multiplexer partial wave after, connect successively the 3rd Erbium-Doped Fiber Amplifier (EDFA), the second adjustable optical attenuator and Polarization Controller, be used for the pump light input of XGM structure;
Described detection light and pump light input photo-coupler are by output after the second semiconductor optical amplifier and bandpass filter conversion.
5. the All Optical Wavelength Conversion method of as claimed in claim 4 pair of semiconductor optical amplifier structure, it is characterized in that: described another Lu Guangxian carries out power amplification by the second Erbium-Doped Fiber Amplifier (EDFA), make it work in the degree of depth saturation region of the first semiconductor optical amplifier, the modulation intelligence that carries on it is thoroughly wiped, become the direct current signal light of power invariability, then regulate its performance number via the first adjustable optical attenuator.
6. the All Optical Wavelength Conversion method of as claimed in claim 4 pair of semiconductor optical amplifier structure, it is characterized in that: described upward signal light first passes through the wavelength division multiplexer partial wave, then regulate its performance number through the 3rd Erbium-Doped Fiber Amplifier (EDFA) and the second adjustable optical attenuator respectively, and regulate its polarization state by Polarization Controller.
7. the All Optical Wavelength Conversion method of as claimed in claim 4 pair of semiconductor optical amplifier structure, it is characterized in that: described the second semiconductor optical amplifier is synchronously transferred to the data message in pump light and is surveyed on light, through bandpass filter filtering pump light frequency component, the detection light frequency component of output carries the data message opposite with up pump signal light amplitude, and the information that realizes is from pump light to the transfer of surveying on light.
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| GB201311862D0 (en) * | 2013-07-02 | 2013-08-14 | Queen Mary & Westfield College | Optoelectronic devices, methods of fabrication thereof and materials therefor |
| CN103955101A (en) * | 2014-03-20 | 2014-07-30 | 北京邮电大学 | Method of generating 16QAM (Quadrature Amplitude Modification) signal in twice four-wave mixing processes based on SOA (Semiconductor Optical Amplifier) |
| CN104468018A (en) * | 2014-12-12 | 2015-03-25 | 国网湖北省电力公司信息通信公司 | Optical transmission system and method based on semiconductor all-optical wavelength converter |
| CN104902353A (en) * | 2015-06-17 | 2015-09-09 | 武汉长光科技有限公司 | Ultra dense wavelength division access method and system based on all-optical wavelength conversion |
| EP3148100B1 (en) * | 2015-09-25 | 2019-03-13 | Alcatel Lucent | Amplification device with amplification stages with polarized soas and processing stage, for amplifying optical signals in a wdm transmission system |
| US9843410B2 (en) * | 2015-11-18 | 2017-12-12 | Fujitsu Limited | Low-noise optical phase sensitive amplifier using a semiconductor nonlinear optical device |
| CN110602575B (en) * | 2019-09-02 | 2022-03-25 | 烽火通信科技股份有限公司 | WDM PON wavelength expansion method and system |
| CN118282515A (en) * | 2022-12-29 | 2024-07-02 | 中兴通讯股份有限公司 | Optical amplifier, optical module, and optical relay device |
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