CN106602403A - Method and device for realizing low-power all-optical quantization based on micro-nano resonant cavity - Google Patents
Method and device for realizing low-power all-optical quantization based on micro-nano resonant cavity Download PDFInfo
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- CN106602403A CN106602403A CN201710114371.6A CN201710114371A CN106602403A CN 106602403 A CN106602403 A CN 106602403A CN 201710114371 A CN201710114371 A CN 201710114371A CN 106602403 A CN106602403 A CN 106602403A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1042—Optical microcavities, e.g. cavity dimensions comparable to the wavelength
Abstract
The present invention discloses a method for realizing low-power all-optical quantization based on a micro-nano resonant cavity. The current all-optical sampling technology and the linear relation of the resonance wavelength and he incident light pulse of the micro-nano resonant cavity are combined, and the spectrum coding is performed by using a filter to realize the all-optical quantification. The device comprises an all-optical sampling system based on the nonlinear polarization rotation of a semiconductor optical amplifier, a sampling pulse spectrum broadening system through intensity modulation, an optical quantization system based on the micro-nano resonant cavity and an optical encoding system; and simulation optical signals are loaded to the strength envelop function of the sampling optical pulse sequence to realize optical sampling, the optical pulse after sampling is first subjected to the spectrum broadening system broadening, then realizes the optical quantification through the micro-nano resonant cavity to, and finally performs encoding through the optical encoding system. The method and device for realizing low-power all-optical quantization based on the micro-nano resonant cavity can greatly reduce the requirement on the sampling pulse power and break through the defects of the current all-optical quantification technology so as to have a chance to realize the high-speed and high-precision all-optical quantification.
Description
Technical field
The invention belongs to analog optical signal quantification technique field, specially realizes the full light quantity of low-power using micro-nano resonator cavity
The method and apparatus of change, can break through existing full light quantization technical disadvantages, be expected to realize high speed, high-precision full light quantization.
Background technology
At present, the information in fiber optic communication will realize fiber optic communication mostly in the form of analogue signal in the optical domain
Analogue signal must be converted into digital signal.Analog-digital converter（ADC）Mould is realized by sampling, quantization, three processes of coding
Intend signal to the conversion of digital signal, be the bridge for connecting analogue signal and digital signal.Optical analog signal passes through in area of light
Sampling, quantization, three processes of coding realize analogue signal to the conversion of digital signal.
Optical Sampling and coding techniques relative maturity, now the difficult point of full light ADC technologies be concentrated mainly on full light with emphasis
On quantification technique, this is also the major technology bottleneck of the full light ADC development of puzzlement.It is main that more full light quantization scheme is studied at present
Two classes, the first kind can be classified as：Light quantization, Equations of The Second Kind are realized using the modulating characteristic of manipulator period multiplication：Using non-linear
The intensity envelope information of sampling pulse is converted to wavelength information by effect, realizes quantization encoding by wave filter.
First kind quantization scheme is that Taylor by USN's electronic leaning laboratory et al. was proposed earliest in 1975.Profit
Quantization encoding is realized with the periodic modulation characteristic of electrooptic modulator, its ultimate principle is to be carried in signal parallel to be quantified
Multiple electrodes length multiplication electrooptic modulator on, using each manipulator modulation characteristics curve period multiplication characteristic come reality
Now to exporting the coding of light signal strength, therefore also it is referred to as period multiplication type full light quantization coding.Will be manipulator maximum defeated
The half for going out light intensity is set to decision threshold, is judged to digital signal " 1 " higher than decision threshold, is judged to numeral less than threshold value
Signal " 0 ", for different input voltage amplitudes can obtain one group of corresponding quantization encoding.The method is the voltage to being input into
Amplitude is quantified, and is not particularly suited for the full optical analog to digital conversion of optical analog signal.The researcher of Osaka, Japan university in 2005 exists
Identical coding principle is utilized on the basis of this, it is proposed that one kind utilizes properties in nonlinear optical loop mirror（NOLM）To realize modulation period
The quantization scheme of multiplication.Replace the Electro-optical Modulation in former scheme using a series of NOLM doubled through curve periodic
Device, carries out full light quantization coded treatment to the light pulse after sampling.The difficult point of this scheme is NOLM rings in input signal power
The nonlinear effect of large amount of complex can be produced after increase, it is difficult to obtain and quantify necessary ideal multicycle transfer curve,
Have a strong impact on quantification effect.Later, the scholar of Osaka University was improved to the program, but cannot still produce uniform tune
Characteristic curve processed.In addition, the shortcoming of this quantization scheme is that each significance bit is required to one group of quantizer and comparator,
Complex structure, it is relatively costly, and the setting of comparator threshold has had a strong impact on quantified precision.
The basic thought of Equations of The Second Kind quantization scheme is believed the intensity of the light pulse after sampling by certain nonlinear effect
Breath is converted to certain change on optical pulse spectrum, then using now very ripe wavelength processor to change spectrally
Change is processed, and realizes full light quantization coding.P. P. Ho in 1997 et al. utilize cross-phase modulation effect, varying strength
Signal pulse makes probing wave produce different phase shifts, and its phase-shift phase is relevant with the intensity of signal pulse, so as to realize light intensity-frequency
Transformation.2002, T. Konishi et al. were proposed first using ultrashort pulse soliton self-frequency sh effect in a fiber
（SSFS）Realize the scheme of full light quantization.University of Electronic Science and Technology, Beijing University of Post ＆ Telecommunication are to realizing quantization encoding based on SSFS effects
Scheme be also carried out numerous studies, and achieve the result of study that quantified precision is 6bit.S.Oda in 2005 et al. proposes base
The scheme of full optical analog to digital conversion is realized in cutting super continuous spectrums, using the sampling light pulse through intensity modulated in dispersion flattene light
During fine generation super continuous spectrums, its spectrum width and sampling pulse intensity are linear, cut super continuous spectrums by array waveguide grating
Into the signal of different wave length, and each passage is detected, the strong of incident pulse is judged according to the number of active lanes for detecting
Degree, so as to realize light quantization.This full light quantization encoding scheme advantage for realizing that based on nonlinear effect " intensity-wavelength " maps
It is that it need not obtain preferable multicycle transfer curve, and the maximum difficult point of this exactly Taylor scheme.On the other hand,
The program does not need each significance bit one group of quantizer of correspondence and comparator, it also avoid the setting of comparator threshold to quantifying
The impact of precision.
But as current the commonly used optical fiber of such scheme is used as nonlinear dielectric, nonlinear factor is relatively small,
Wanting the enough nonlinear effects of generation needs the sampling pulse of higher-energy, and this can improve and sampling pulse power is wanted
Ask, greatly limit the use range of analog digital conversion.Due to the refractive index of silicon（n=3.48）Much larger than silicon dioxide（n=1.46）
With the refractive index of air, very strong light field can be provided based on fiber waveguide made by silicon and limited, and then improve unit area
Interior energy density, enhances the interaction of light and material, greatly strengthen the nonlinear effect in medium.Existing silicon substrate
Nonlinear factor can be lifted 5 orders of magnitude for silica fibre by nanometer waveguide.Silicon substrate micro-nano resonator cavity it is another
Individual advantage is that it has very high quality factor, has reached million orders of magnitude.
The content of the invention
To solve, the full light quantization technical pattern of current optical analog signal is complicated, sampling pulse power is higher asks the present invention
Topic, using silicon-based micro ring resonator high non-linearity and high-quality-factor the characteristics of, by existing full Optical Sampling technology and micro-nano
Resonator cavity technology combines, carried out using wave filter it is optical spectrum encoded, propose one kind the full light of low-power is realized based on micro-nano resonator cavity
The method and apparatus of quantization.The program not only greatly reduces the requirement to sampling pulse power, and breaches existing complete
Light quantization technical disadvantages, are expected to realize high speed, high-precision full light quantization.
The present invention adopts the following technical scheme that realization：
A kind of method that the full light quantization of low-power is realized based on micro-nano resonator cavity：Analog optical signal is loaded into into sampled light arteries and veins first
Rush, then to the optical pulse spectrum broadening after sampling（Broadening width is approximately more than free light
Spectral limit）, then reflected using the high non-linearity and filter effect of micro-nano resonator cavity complete to sample " intensity-wavelength " of light pulse
Penetrate and realize light quantization, finally optical encoding is carried out using optically filtering method.
A kind of device that the full light quantization of low-power is realized based on micro-nano resonator cavity, including the full Optical Sampling based on SOA-NPR
Optical pulse spectrum broadening system, the optics quantization system based on micro-nano resonator cavity and the light based on optically filtering after system, sampling
Spectral encoding system.Described is by a SOA, two Polarization Controllers, a light belt based on the full Optical Sampling system of SOA-NPR
Bandpass filter, two fiber couplers and a polarization beam apparatus composition.Described optical pulse spectrum broadening system is by height
Non-thread dispersion shifted optical fiber is constituted.Described is by silicon substrate micro-nano resonator cavity group based on the optics quantization system of micro-nano resonator cavity
Into.Described optical filter system is made up of waveguide optical grating Array wave filter.Analog optical signal is loaded into into sampling light pulse
Optical Sampling is realized on the intensity envelope of sequence, the light pulse after sampling is through high nonlinear dispersion shifted fiber frequency domain broadening time domain
Keep constant, the high non-linearity and wavelength of micro-nano resonator cavity and the mapping relations of intensity are then utilized by silicon substrate micro-nano resonator cavity
Light pulse to sampling carries out optics quantization, eventually passes waveguide optical grating Array wave filter and is filtered coding.
The operation principle of the present invention is as follows：
1st, due to the unsymmetry of TE and TM moulds in semiconductor laser, TE and TM moulds possess different gains and different refractions
, there is birefringence effect in rate.When pump light and detection light are incided in SOA simultaneously, the stronger pump light of power can be consumed rapidly
SOA active area carriers so as to carrier concentration redistribute, now detect light TE and TM moulds experienced different gains and
, there is non-linear rotation so as to cause the polarization state for detecting light in output in the change of effective refractive index.In the outfan profit of SOA
The polarization state information for detecting light is converted to into amplitude information with analyzer, so as to realize the sampling to detecting light.
2nd, temporal signatures are constant to be ensured to light pulse frequency domain broadening using high non-thread dispersion shifted optical fiber, the light after broadening
Spectral width makes full use of the resonance wavelength of micro-nano resonator cavity strong with incident pulse slightly larger than the Free Spectral Range of micro-nano resonator cavity
The linear region of degree.
3rd, micro-nano resonator cavity is consisted of Shu field parallel with two straight wave guide couplings of dying a ring resonator, is metThe light of condition will occur resonance in resonance intracavity, and corresponding wavelength is referred to as resonance wavelength.Its
In：λ is resonance wavelength, and neff is the effective refractive index of micro-nano resonator cavity, and D is the diameter of microcavity, and m is integer.Due to non-linear
Effect, the incident pulse of injection change the effective refractive index of resonator cavity, and different capacity incident pulse will cause different effective foldings
Penetrate rate change, it will there are different resonance wavelength outputs, realize the mapping of " intensity-wavelength ", complete full light quantization.
Compared with prior art, the present invention not only overcomes the modulating characteristic of manipulator period multiplication to realize light quantization
The complex structure of scheme, relatively costly, and the setting of comparator threshold has had a strong impact on the shortcoming of quantified precision, also overcomes
The mapping of generally " intensity-wavelength " completes the higher shortcoming of sampling pulse power that full light quantization needs, and its advantage embodies as follows：
The present invention not only greatly reduces the requirement to sampling pulse power, and breaches existing full light quantization technical disadvantages, has
Hope and realize high speed, high-precision full light quantization.
The present invention is reasonable in design, and the realization of the method contributes to Networks of Fiber Communications technology and related optical treatment technology
Development.
Description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of sampler of the present invention.
Fig. 3 is the structural representation of quantizer of the present invention.
Fig. 4 is optical spectrum encoded device used in the present invention.
Fig. 5 is the output light spectrogram at quantizer through used herein and drop ends.
In figure：The full optical samplers of 1-, optical pulse spectrum broadening device after 2- samplings, the full optical quantizers of 3-, 4- are optical spectrum encoded
Device, the first Polarization Controllers of 1a-, the first fiber couplers of 1b-, 1c- semiconductor optical amplifiers（SOA）, the second Polarization Controls of 1d-
Device, 1e- optical band pass filters, 1f- polarization beam apparatus, the second fiber couplers of 1g-, the optical branching device of 4a-1*3, the second ripples of 4b-
Guide-lighting grating filter, 4c- second waveguide grating filters, the 3rd waveguide optical grating wave filter of 4d-.
Specific embodiment
A kind of method that the full light quantization of low-power is realized based on micro-nano resonator cavity in the present embodiment, first by analog optical signal
It is loaded on the intensity envelope of sampling light pulse sequence and realizes Optical Sampling, the light pulse after sampling is through high non-linearity dispersion shift
Optical fiber frequency domain broadening time domain keeps constant, and the high non-linearity and wavelength of micro-nano resonator cavity are then utilized by silicon substrate micro-nano resonator cavity
Optics quantization is carried out to the light pulse sampled with the mapping relations of intensity, waveguide optical grating Array wave filter is eventually passed and is filtered
Coding.The method is that existing full Optical Sampling technology and the resonance wavelength of micro-nano resonator cavity and the power of incident light pulse are linear
Relation combines, and is carried out optical spectrum encoded using wave filter, realizes full light quantization.
It is a kind of in the present embodiment to realize that the device of the full light quantization of low-power is included based on SOA-NPR's based on micro-nano resonator cavity
Full Optical Sampling system, pulse spectrum broadening system, the optical quantities based on micro-nano resonator cavity are constituted by high non-thread dispersion shifted optical fiber
Change system and the filtering code system being made up of waveguide optical grating Array wave filter.
The full light quantization scheme proposed by the present embodiment greatly reduces the requirement to sampling pulse power, and breaches
Existing full light quantization technical disadvantages, are expected to realize high speed, high-precision full light quantization.
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.
A kind of experimental provision for realizing full light quantization, as shown in figure 1, including optical pulse spectrum after full optical sampler 1, sampling
Broadening device 2, full optical quantizer 3 and optical spectrum encoded device 4.
Wherein, full optical sampler 1 is by a SOA, two Polarization Controllers, an optical band pass filter, two optical fiber couplings
Clutch and a polarization beam apparatus composition；Concrete annexation is, as shown in Fig. 2 the first Polarization Control of full optical sampler 1
The outfan of device 1a connects the input of the first fiber coupler 1b, and the outfan connection of the first fiber coupler 1b is partly led
The input of body image intensifer 1c, the outfan of the semiconductor optical amplifier 1c connect the input of the second Polarization Controller 1d
End, the outfan of the second Polarization Controller 1d connect the input of optical band pass filter 1e, the optical band pass filter 1e
Outfan connect the input of polarization beam apparatus 1f, the outfan of the polarization beam apparatus 1f connects the second fiber coupler 1g
Input, the outfan of the outfan of the second fiber coupler 1g as full optical sampler 1.
Optical pulse spectrum broadening device 2 is made up of high non-thread dispersion shifted optical fiber.
Full optical quantizer 3 is as shown in figure 3, be made up of silicon substrate micro-nano resonator cavity.The Input ends of the silicon substrate micro-nano resonator cavity
The outfan of optical pulse spectrum broadening device 2 after connection sampling, the Drop ends connection of the silicon substrate micro-nano resonator cavity are optical spectrum encoded
The input of device 4.
Optical spectrum encoded device 4 as shown in figure 4, including optical branching device 4a and first, second and third waveguide optical grating Array wave filter 4b,
4c、4d。
Analogue signal connects full optical sampler, and the pulse after sampling connects one section of high nonlinear dispersion shifted fiber, then
Couple with the Input ends of silicon substrate micro-nano resonator cavity, the drop ends connection waveguide optical grating Array wave filter of silicon substrate micro-nano resonator cavity.
During work, analog optical signal is loaded on the intensity envelope of sampling light pulse sequence and realizes Optical Sampling, after sampling
Light pulse through high nonlinear dispersion shifted fiber spectrum widening to about 30nm time domain specifications keep it is constant.Light arteries and veins after broadening
The Input ends for being mapped to silicon substrate micro-nano resonator cavity are poured, the wavelength for meeting condition of resonance will bring out from Drop and penetrate；Due to non-linear
Effect, different capacity incident pulse will change the effective refractive index of resonator cavity, it will have different resonance wavelength outputs, realize
The mapping of " intensity-wavelength ", completes full light quantization.The optical pulse strikes for completing full light quantization complete optical spectrum encoded to device 4.
This embodiment completes the optical branching device of the light pulse through 1*3 of full light quantization by taking the quantified precision of 3bit as an example
It is divided into 3 tunnels, this 3 road light beam is incided as 4b, 4c, 4d have the waveguide optical grating filter array of cycle double characteristic in Fig. 4, complete
Into optical spectrum encoded.The transmission spectrum at the Drop ends of silicon substrate micro-nano resonator cavity, simulation result such as Fig. 5 institutes are simulated using FDTD simulation softwares
Show.Different capacity incident pulse will change the effective refractive index of resonator cavity, have different resonance wavelength outputs.
The above is only, to presently preferred embodiments of the present invention, not to make any pro forma restriction to the present invention,
To any simple modification made for any of the above embodiments, equivalent variations belong to the present invention to every technical spirit according to the present invention
In the range of technical scheme.
Claims (6)
1. one kind realizes the full light quantization device of low-power based on micro-nano resonator cavity, it is characterised in that：Including full optical sampler（1）,
The full optical sampler（1）Outfan connection sampling after optical pulse spectrum broadening device（2）Input, light pulse after sampling
Spectrum widening device（2）Outfan connect full optical quantizer（3）Input, the full optical quantizer（3）Outfan connect
Connect optical spectrum encoded device（4）Input.
It is 2. according to claim 1 that the full light quantization device of low-power is realized based on micro-nano resonator cavity, it is characterised in that：It is described
Full optical quantizer is made up of silicon substrate micro-nano resonator cavity, light pulse light after the Input ends connection sampling of the silicon substrate micro-nano resonator cavity
Spectrum widening device（2）Outfan, the Drop ends of the silicon substrate micro-nano resonator cavity connect optical spectrum encoded device（4）Input.
It is 3. according to claim 1 and 2 that the full light quantization device of low-power is realized based on micro-nano resonator cavity, it is characterised in that：
The full optical sampler（1）Including the first Polarization Controller（1a）, first Polarization Controller（1a）Outfan connection the
One fiber coupler（1b）Input, first fiber coupler（1b）Outfan connection semiconductor optical amplifier（1c）
Input, the semiconductor optical amplifier（1c）Outfan connect the second Polarization Controller（1d）Input, described
Two Polarization Controllers（1d）Outfan connection optical band pass filter（1e）Input, the optical band pass filter（1e）It is defeated
Go out end connection polarization beam apparatus（1f）Input, the polarization beam apparatus（1f）Outfan connect the second fiber coupler
（1g）Input, second fiber coupler（1g）Outfan as full optical sampler（1）Outfan.
It is 4. according to claim 3 that the full light quantization device of low-power is realized based on micro-nano resonator cavity, it is characterised in that：It is described
Optical pulse spectrum broadening device after sampling（2）It is made up of high non-thread dispersion shifted optical fiber.
It is 5. according to claim 4 that the full light quantization device of low-power is realized based on micro-nano resonator cavity, it is characterised in that：It is described
Optical spectrum encoded device（4）It is made up of optical branching device and waveguide optical grating Array wave filter.
6. a kind of method that the full light quantization of low-power is realized based on micro-nano resonator cavity, it is characterised in that：First by analog optical signal
It is loaded on the intensity envelope of sampling light pulse sequence and realizes Optical Sampling, the light pulse after sampling is through high non-linearity dispersion shift
Optical fiber frequency domain broadening time domain keeps constant, and the high non-linearity and wavelength of micro-nano resonator cavity are then utilized by silicon substrate micro-nano resonator cavity
Optics quantization is carried out to the light pulse sampled with the mapping relations of intensity, waveguide optical grating Array wave filter is eventually passed and is filtered
Coding.
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Application publication date: 20170426 |