CN102778801B - Normal-phase/inverse-phase all-optical wavelength conversion device - Google Patents
Normal-phase/inverse-phase all-optical wavelength conversion device Download PDFInfo
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- CN102778801B CN102778801B CN201210298025.5A CN201210298025A CN102778801B CN 102778801 B CN102778801 B CN 102778801B CN 201210298025 A CN201210298025 A CN 201210298025A CN 102778801 B CN102778801 B CN 102778801B
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Abstract
The invention discloses a normal-phase/inverse-phase all-optical wavelength conversion device. The normal-phase/inverse-phase all-optical wavelength conversion device is capable of realizing all-optical wavelength conversion by means of cross gain modulation and cross polarization modulation of a high polarization sensitive semiconductor optical amplifier, and regulating the polarization states of detection light and pump light through a polarization controller in stead of the traditional way of adding a polarization beam splitter or a delay interferometer behind the semiconductor optical amplifier; therefore, the normal-phase detection light or inverse-phase detection light is output after conversion is realized. The normal-phase/inverse-phase all-optical wavelength conversion device is simplified in the optical wavelength conversion structure based on the cross gain modulation and the cross polarization modulation of the semiconductor optical amplifier, which is advantageous for integration of such a product; therefore, a powerful promotion effect is provided for the realization of routing of next-generation optical network; and the normal-phase/inverse-phase all-optical wavelength conversion device has a wide application prospect.
Description
Technical field
The present invention relates to the full light signal treatment technology in photoelectron technology field, be specifically related to a kind of positive and anti-phase full optical wavelength converting device.
Background technology
In the optical communication network of wavelength-division multiplex, wavelength conversion is to solve wavelength competition, realizes the gordian technique of wavelength re-using and clog-free wavelength route.It need to carry out digital signal modulated that the pump light signals of wavelength conversion is loaded with to the detection light signal different from pump light signals wavelength of another road, and as shown in Figure 1, at the light input end of Wavelength converter, input wavelength is λ
pumpthe pulsed light that is loaded with digital signal as pump light, at light input end input wavelength, be simultaneously λ
probecontinuous light as surveying light, at output terminal, can obtain wavelength is λ
probethe detection light that is loaded with digital signal, the digital signal that this digital signal is loaded with pump light is consistent, thereby realizes wavelength conversion.
In the Wavelength transformational structure of traditional based semiconductor image intensifer, the light signal before and after conversion is anti-phase.In order to make light signal and the pump light homophase after conversion, generally need to after semiconductor optical amplifier, add a polarization beam apparatus or delay interferometer (DI), will make like this system become complicated.
Document " Y. Liu, et al. Wavelength conversion using nonlinear polarization rotation in a single semiconductor optical amplifier [J] .IEEE Photonics Technology Letters., 2003, 15 (1): 90-92 " reported a kind of full optical wavelength converting device of based semiconductor image intensifer polarization rotation effect, this device comprises two Polarization Controllers, semiconductor optical amplifier and polarization beam apparatus, at semiconductor optical amplifier, realize after wavelength conversion, utilize its Polarization Controller below and the light signal of polarization beam apparatus regulation output, to obtain light signal after positive or anti-phase conversion.This scheme additionally adds polarization beam apparatus and Polarization Controller after semiconductor optical amplifier, though it is anti-phase to realize wavelength, uses device more, is unfavorable for Wavelength conversion devices integration of compact.
Document " J. Leuthold; L. Moller; J. Jaques; et al.160 Gbit/s SOA all-optical wavelength converter and assessment of its regenerative properties[J] .Electron.Lett.; 2004; 40 (9): 554-555 " reported that a kind of full optical wavelength converting device of based semiconductor image intensifer, this device comprise a Coupling power device, semiconductor optical amplifier, delay interferometer; From light input end input wavelength, be λ
pumpthe pulsed light that is loaded with digital signal as pump light, at light input end input wavelength, be simultaneously λ
probecontinuous light as surveying light.At the output terminal of semiconductor optical amplifier, can obtain wavelength is λ
probethe detection light that is loaded with digital signal.Delay interferometer plays the anti-phase effect of this digital signal light, and the digital signal that this digital signal is loaded with pump light is consistent, thereby realizes wavelength conversion.This XGM that installs main based semiconductor image intensifer is realized wavelength dress and is changed, and has feature simple in structure, to be easy to realization.Its principle is when pump light enters semiconductor optical amplifier with detection light two-beam simultaneously, and while there is no the input of signal pump light, semiconductor optical amplifier often amplifies surveying light positive, gains higher, and the detection of optical power of output is higher; But when having the input of superpower signal pump light, because the light intensity of signal pump light is stronger, semiconductor optical amplifier gain is reached capacity, diminish thereby cause surveying the gain of light, the detection of optical power of output is lower, Here it is cross-gain modulation.Like this, by signal pump light, semiconductor optical amplifier is carried out to gain modulation, and then the light intensity of modulation detection light, the information that realized, from flashlight to the transfer of surveying light, has completed All Optical Wavelength Conversion.But this scheme is with other, to utilize the cross-gain modulation of semiconductor optical amplifier to realize optical wavelength exchange the same, all needs delay interferometer DI to realize wavelength anti-phase.Delay interferometer DI is by carrying out filtering, screening at frequency domain to surveying light spectrum, thereby obtains the detection light signal of positive output, can make like this structure more complicated, and also very harsh for the requirement of filtering device, implements more difficult.
Summary of the invention
For above-mentioned prior art, the object of this invention is to provide a kind of positive and anti-phase full optical wavelength converting device, its technical matters that will solve is: existing converting system is too complicated, and also very harsh to the requirement of filtering device, implements more difficult.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of positive and anti-phase full optical wavelength converting device, it is characterized in that, comprise laser instrument, the first Polarization Controller, the second Polarization Controller, the 3rd Polarization Controller, lithium niobate modulator, Erbium-Doped Fiber Amplifier (EDFA), the first bandpass filter, the second bandpass filter, tunable attenuator, microwave amplifier, programmable pulse generator, Wavelength tunable laser, photo-coupler, high Polarization-Sensitive semiconductor optical amplifier; Described laser instrument, the first Polarization Controller, lithium niobate modulator, Erbium-Doped Fiber Amplifier (EDFA), the first bandpass filter, tunable attenuator, the second Polarization Controller, photo-coupler, high Polarization-Sensitive semiconductor optical amplifier, the second bandpass filter, connected by said sequence successively by single-mode fiber; Programmable pulse generator connects microwave amplifier through single-mode fiber, and microwave amplifier connects an input end of lithium niobate modulator, and Wavelength tunable laser is connected to an input end of photo-coupler through the 3rd Polarization Controller.
Described laser instrument produces direct current light, and pulse signal generator produces microwave signal, and microwave signal is loaded on lithium niobate modulator after microwave amplifier amplifies, and modulates this direct current light and makes direct current light as the pump light λ in wavelength conversion
pump; Pump light coordinates with adjustable attenuator through Erbium-Doped Fiber Amplifier (EDFA) controls its light intensity, and through the first bandpass filter filtering noise, through the second Polarization Controller, controls polarization state; The λ that Wavelength tunable laser output wavelength is
probedirect current light is as surveying light, and the 3rd Polarization Controller is controlled its polarization state.Pump light λ
pumpwith detection light λ
probeafter photo-coupler coupling, the light signal after output optical signal is wavelength conversion after the XGM of too high Polarization-Sensitive semiconductor optical amplifier and cross polarization modulation.Because adopted semiconductor optical amplifier is extremely sensitive to polarization characteristic, only have a kind of light signal of polarization state effectively to pass through, the active optical waveguide that is similar to image intensifer inside has the function of polarization signal being carried out to analyzing.
Explanation further, regulates the polarization state of the second Polarization Controller that the polarization state of pump light is changed, and output optical signal switches between positive and anti-phase output state.
Compared with prior art, beneficial effect of the present invention shows:
The present invention only utilizes single Polarization-Sensitive semiconductor optical amplifier just to realize the wavelength conversion of positive, simple in structure, does not introduce other additional device; Its structure is simpler, and all devices can be integrated on same semiconductor chip, have structure simplify little, be easy to integrated feature.
Accompanying drawing explanation
Fig. 1 is full optical wavelength converting device principle schematic;
Fig. 2 is principle schematic of the present invention;
Fig. 3 is experimental result comparison diagram of the present invention;
Reference numeral is: 1 Polarization Controller, the 2nd, lithium niobate modulator, the 3rd, bandpass filter, the 4th, photo-coupler.A be pump light signals, b for from the Polarization-Sensitive semiconductor optical amplifier outgoing of height with the anti-phase detection light signal of pump light, c for from the Polarization-Sensitive semiconductor optical amplifier outgoing of height and detection light signal pump light homophase.
embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
Shown in Fig. 2, a kind of positive and anti-phase full optical wavelength converting device, it comprises laser instrument, the first Polarization Controller, the second Polarization Controller, the 3rd Polarization Controller, lithium niobate modulator, Erbium-Doped Fiber Amplifier (EDFA), the first bandpass filter, the second bandpass filter, tunable attenuator, microwave amplifier, 2.5Gbit/s programmable pulse generator, Wavelength tunable laser, photo-coupler, high Polarization-Sensitive semiconductor optical amplifier, between each device, with single-mode fiber, connects.Laser instrument produces direct current light, produces microwave signal by pulse signal generator simultaneously, after microwave amplifier amplifies, is carried on lithium niobate modulator, and the direct current light that modulated laser produces, as the pump light λ in wavelength conversion
pump, Erbium-Doped Fiber Amplifier (EDFA) and adjustable attenuator are used in conjunction with, and control pump light light intensity, the first bandpass filter filtering noise, and the second Polarization Controller is controlled pumping polarisation of light state.The λ that tunable laser output wavelength is
probe direct current light is as surveying light, and the 3rd Polarization Controller is controlled its polarization state.Pump light λ
pumpwith detection light λ
probeafter photo-coupler coupling, through cross-gain and the cross polarization modulation of semiconductor optical amplifier, output optical signal is the light signal after wavelength conversion.
Embodiment
The present invention, under following design parameter, has carried out experimental verification to a kind of positive provided by the invention and anti-phase full optical wavelength converting device.By the 2.5Gbit/s programmable pulse generator of Error Detector AnritsuMT1810A, produced the pseudo-random code sequence " 10000000 " of 2.5Gbit/s, after amplifying, microwave loads on the logical 2.5Gbit/s lithium niobate optical modulator of alive dimension, the wavelength that modulation is sent by laser instrument is the direct current light of 1554.5nm, as the pump light in wavelength conversion, in order to make the pump light light intensity of high Polarization-Sensitive semiconductor optical amplifier enough large, and can in experiment, regulate pumping light intensity, by Erbium-Doped Fiber Amplifier, it is amplified, and coordinate an adjustable attenuator to control its light intensity.The direct current light that is 1545.25nm by Agilent HP 8168F Wavelength tunable laser output wavelength is as surveying light.Pump light is coupled into high Polarization-Sensitive semiconductor optical amplifier with detection light by a 1:1 coupling mechanism, high Polarization-Sensitive semiconductor optical amplifier is selected the IPSAD1503 model of Inphenix company, the Polarization-Dependent Gain of the high Polarization-Sensitive semiconductor optical amplifier of this model can reach 18dB, after the Polarization-Sensitive semiconductor optical amplifier of height, utilize bandpass filter that a centre wavelength is 1545.25nm by pump light filtering, obtain the detection light of exporting after wavelength conversion.Regulate the second Polarization Controller, regulate the polarization state of pump light, from the light signal of the second bandpass filter output, can between positive and anti-phase output state, switch.Experimental result as shown in Figure 3, in figure, the signal of arrow a indication, for the pump light signals of the high Polarization-Sensitive semiconductor optical amplifier of input, is a row positive pulse signal; After the signal of arrow b indication is wavelength conversion, from the detection light signal anti-phase with pump light of the Polarization-Sensitive semiconductor optical amplifier outgoing of height, be a row negative pulse; Regulating after the second Polarization Controller, can obtain the signal output of arrow c indication, after it is wavelength conversion, from the Polarization-Sensitive semiconductor optical amplifier outgoing of height and detection light signal pump light homophase, is a row positive pulse.
Above-mentioned embodiment has realized the transfer of light signal from wavelength 1554.5nm to 1545.25nm, has completed All Optical Wavelength Conversion, and has reached the light signal output polarity of controlling after wavelength conversion, i.e. positive output or anti-phase output.
The route implementing of optical-fiber network of future generation needs miniaturization, integrated, superfast All Optical Wave Converter part.From specific embodiments of the invention, the present invention can meet device to requirement at a high speed and miniaturization, integrated trend.Therefore, a kind of positive and anti-phase full optical wavelength converting device realized that the present invention proposes, has simplified similar light wavelength conversion device, is easy to integratedly, can for the route implementing of optical-fiber network of future generation, provide strong impetus, is with a wide range of applications.
By reference to the accompanying drawings the embodiment of invention has been carried out to exemplary description above, obviously the invention is not restricted to this, the various remodeling that carry out within the scope of the present invention all do not exceed protection scope of the present invention.
Claims (1)
1. a positive and anti-phase full optical wavelength converting device, comprise tunable laser source, adjustable lock mode laser, the first Polarization Controller, the second Polarization Controller, the 3rd Polarization Controller, lithium niobate modulator, Erbium-Doped Fiber Amplifier (EDFA), the first bandpass filter, tunable attenuator, programmable pulse generator, it is characterized in that, also comprise laser instrument, Wavelength tunable laser, photo-coupler, high Polarization-Sensitive semiconductor optical amplifier; Described laser instrument, the first Polarization Controller, lithium niobate modulator, Erbium-Doped Fiber Amplifier (EDFA), the first bandpass filter, tunable attenuator, the second Polarization Controller, photo-coupler, high Polarization-Sensitive semiconductor optical amplifier, the second bandpass filter, connected by said sequence successively by single-mode fiber; Programmable pulse generator connects microwave amplifier through single-mode fiber, and microwave amplifier connects an input end of lithium niobate modulator, and Wavelength tunable laser is connected to an input end of photo-coupler through the 3rd Polarization Controller.
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| CN101174073A (en) * | 2007-09-29 | 2008-05-07 | 清华大学 | Crossing polarization modulation type full light wavelength converter |
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| KR100730363B1 (en) * | 2003-11-11 | 2007-06-19 | 학교법인 한국정보통신학원 | Optical wavelength converter apparatus and method using the injection locking of a fabry-perot laser diode |
| US8098989B2 (en) * | 2008-05-08 | 2012-01-17 | Nec Laboratories America, Inc. | All-optical wavelength conversion for a polarization multiplexing optical signal |
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