CN102360149A - Method for improving full light sampling linearity based on semiconductor light amplifier polarization rotation effect - Google Patents
Method for improving full light sampling linearity based on semiconductor light amplifier polarization rotation effect Download PDFInfo
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Abstract
The invention provides a method for improving the full light sampling linearity based on the semiconductor light amplifier polarization rotation effect, which is characterized in that maintaining light at proper power is filled for inhibiting the nonlinearity effect of the light gain of a semiconductor light amplifier, the output sampling pulse enveloped harmonic distortion is reduced, and the linearity of a full light sampling system is improved. The method has the characteristics that the structure of the semiconductor light amplifier does not need to be changed, the operation is simple and convenient, and the effect is obvious. The method has the powerful promoting effect on improving the conversion precision of a next generation of an optical analog-to-digital converter, and wide application prospects are realized.
Description
Technical field
The invention belongs to the photoelectron technology field, integrated optics field and Photoelectric Signal Processing field, it is particularly related to improves the method that based semiconductor image intensifer polarization rotates the full gloss appearance linearity.
Background technology
The signal transformation technology that the full gloss appearance technology of based semiconductor image intensifer (SOA) polarization rotation is a kind of light-operated light (see that document Zhang Shangjian Zhang Qian states Li Heping etc. the full gloss appearance [J] of based semiconductor image intensifer nonlinear polarization rotation effect. the semiconductor journal; 2008; 29 (6): 1031-1035); Utilize the modulating action of simulating signal light, make the sampling pulse polarization state of light rotate, become intensity modulated to the polarization state modulation conversion of pulsed light through analyzer to carrier concentration in the semiconductor optical amplifier and gain; Obtain intensity by the sampling light pulse of flashlight modulation, realize the high-speed sampling of high repetition pulsed light simulating signal light with this.
Because this scheme based on nonlinear effect mechanism, certainly exists nonlinear distortion, the non-linear conversion accuracy that will directly influence all-light analog-digital converter of sampling system in the sampling process.Therefore, it is very necessary improving the non-linear of sampling system.The gain of light of semiconductor optical amplifier is the key factor that produces nonlinear distortion to the characteristic that input optical power presents nonlinearities change; Can in semiconductor optical amplifier, introduce gain blocked structure (Gain-clamped) controls the carrier concentration mudulation effect; The non-linear of the gain of light that reduces semiconductor optical amplifier (seen document CHEN G X; LI W; XU C L et al.Time and spectral domain properties of distributed feedback type gain-clamped semiconductor optical amplifiers [J] .IEEE Photon.Tech.Lett., 2006,18 (8): 932-934); Gain blocked structure comprises several types such as distributed feedback structure, distributed Bragg reflector structure, Fiber Bragg Grating FBG structure and ring cavity structure; Realize the complex manufacturing of these several kinds of structures, cost is higher, is not suitable for the application scenario of general semiconductor optical amplifier.
Summary of the invention
The purpose of this invention is to provide a kind of method of improving the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity; This method reduces the non-linear of the semiconductor optical amplifier gain of light through the maintenance light that injects appropriate power, improves full gloss appearance system linearity degree.It has characteristics such as implementation is simple, effect is obvious.
The content of the present invention of description for ease, at first do term definition:
Define the polarization rotation effect of 1 semiconductor optical amplifier
In semiconductor optical amplifier, can the linearly polarized light of any direction of vibration of input be divided into and be parallel to the waveguide aspect and perpendicular to two parts of waveguide aspect, i.e. TE mould and TM mould.TE mould and TM mould are not independent fully the propagation in SOA, and they have different gains and refractive index through indirect the connecting of charge carrier, thereby these two patterns cause that producing gain inequality and phase differential through after the SOA polarization direction changes.After SOA, connect a polarization beam combiner, TE mould and TM mould are interfered on the light transmission shaft of polarization beam combiner, obtain the linearly polarized light that intensity is modulated, the polarization rotation effect of Here it is semiconductor optical amplifier.(Dorren?H?J?S，Lenstra?D，Liu?Y?et?al.Non-linear?polarization?rotation?in?a?semiconductor?amplifiers：Theory?and?application?to?all-optical?flip-flop?memories[J].IEEE?J.Quantum?Electron.，2003，39(1)：141-147)。
The linearity and the conversion efficiency of definition 2 full gloss appearance
According to signal analysis theory, periodic signal is a discrete spectrum through its frequency spectrum of Fourier expansion; Nonperiodic signal is a continuous spectrum through its frequency spectrum of Fourier transform; Periodic signal and nonperiodic signal, Fourier series and Fourier transform, discrete spectrum and continuous spectrum can be changed mutually and united under certain condition.Therefore distortion analysis is the basis that the distortion of arbitrary mould analog signal gloss appearance is discussed to the single frequency signal sampling.The general introducing linearity and two indexs of conversion efficiency are estimated sampling system, and (establish intensity is A to the single-frequency cosine signal of input
0, frequency is ω) through after the sampling system, the output signal on frequency spectrum, will occur incoming frequency the frequency multiplication composition (2 ω, 3 ω ...).Secondary and the above harmonic component of secondary characterize harmonic distortion, i.e. D with the ratio of fundametal compoment in the output signal
k=A
k/ A
l(k=2,3 ...), A wherein
kBe the spectrum intensity of k order harmonic components, A
lSpectrum intensity for first-harmonic.D
kBig more explanation harmonic distortion is serious more, otherwise then more little.The intensity of output signal fundametal compoment characterizes conversion efficiency with the ratio of input first-harmonic intensity, also can regard the slope of sampling transmission curve as, i.e. E
f=A
l/ A
0, A wherein
0Be input fundamental signal intensity.
The present invention proposes a kind of method of improving the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity, it is characterized in that it comprises following steps:
The full gloss appearance system of step 1 constitutes
As shown in Figure 2, full gloss appearance system is by input optical fibre 1, input optical fibre 2, input optical fibre 3; First Polarization Controller 6, coupling mechanism 7, semiconductor optical amplifier 8; Second Polarization Controller 9, optical band pass filter 10, polarization beam combiner 11 connects and composes through light with output optical fibre 5 successively;
Confirming of step 2 optics running parameter
Step 2a: confirm the working current I of semiconductor optical amplifier 8, maximum input optical power P from the technical descriptioon file of semiconductor optical amplifier 8
m, and by the variable power scope [P of sampled signal light
l, P
h];
Step 2b: input electrode 4 input intensities at semiconductor optical amplifier 8 are the working current of I, and input optical power is P in input optical fibre 1
pThe small-signal continuous light, guarantee P simultaneously
pLess than P
l, in the measurement of output end luminous power size of output optical fibre 5;
Step 2c: the ducting layer angle theta of the polarization direction of first Polarization Controller 6 and semiconductor optical amplifier 8
aBe made as 45 degree, the ducting layer angle β of the light transmission shaft of polarization beam combiner 11 and semiconductor optical amplifier 8 is made as 45 degree, and input optical wavelength in centre wavelength to the input optical fibre 1 of adjustment optical band pass filter 10 leaches the small-signal continuous light in the optical fiber 1.Adjust the ducting layer angle theta of second Polarization Controller, 9 polarization directions and semiconductor optical amplifier 8
bThereby, be TE mould and the additional Φ that differs of TM mould introducing
Pc, make from the luminous power of output optical fibre 5 outputs minimum;
Near step 2d: the polarization direction of adjustment first Polarization Controller 6 and the ducting layer angle theta of semiconductor optical amplifier 8 45 degree
a, record θ when the luminous power in the output optical fibre 5 is zero
a, θ
bValue with β;
Step 2e: by the variable power scope [P of sampled analog flashlight
l, P
h] in change input optical power P in the input optical fibre 2
s, at the output terminal record Output optical power of output optical fibre 5.Do not injected the transmission curve of the Output optical power of maintenance light time with the input optical power variation;
Step 2f: input optical power is P in input optical fibre 3
bContinuous light, guarantee P simultaneously
bLess than P
m, the process of repeating step 2c～e obtains keeping the fashionable sampling transmission curve of light beam, changes to be input to the maintenance light luminous power P in the optical fiber 3
bSize, the process of repeating step 2c～e obtains injecting some the sampling transmission curves of the maintenance light time of different capacity, and is as shown in Figure 3;
Observable some transmission curves, compromise are chosen a sampling transmission curve wherein, make it at [P
l, P
h] internal linear degree and conversion efficiency all meet the requirements, the pairing luminous power of this curve is the maintenance luminous power in the input optical fibre 3;
The realization of the full gloss appearance of step 4
Step 4a: the working current I of semiconductor optical amplifier 8 and the maintenance luminous power P in the input optical fibre 3 are set
b, simultaneously in input optical fibre 2 power input greater than P
lLess than P
h, frequency is f
vSimulating signal light;
Step 4b: the input end input repetition frequency at the input optical fibre 1 of full gloss appearance system is f
s, peak power is P
pThe sampled light pulse, obtain the light pulse that luminous power changes with the input signal intensity as linear at the output terminal of output optical fibre 5, thereby, realized improvement simultaneously the sampling linearity complete accomplished gloss appearance.
Just accomplished optimization through above step to the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity.
Need to prove,
Among the step 2c the ducting layer angle theta of the polarization direction of first Polarization Controller 6 and semiconductor optical amplifier 8
aBeing made as 45 degree, is in order to make polarization rotation effect the strongest.
The ducting layer angle theta of adjustment second Polarization Controller, 9 polarization directions and semiconductor optical amplifier 8 among step 2c and the 2d
b, and near 45 degree, adjust the polarization direction of first Polarization Controller 6 and the ducting layer angle theta of semiconductor optical amplifier 8
aMake and do not import the light time in the input optical fibre 2; Minimum and be zero from the luminous power of output optical fibre 5 output, be in order to guarantee that in step 2e from output optical fibre 5 luminous power of output increases with the increase of signal light power in the input optical fibre 2 like this, promptly obtaining slope is positive sampling transmission curve.
In order to obtain the good transmission curve of the linearity, need to increase the maintenance luminous power in the step 3, but the gain saturation effect will cause semiconductor optical amplifier that the amplifying power of signal is descended, thus keep luminous power unsuitable too high, to guarantee high conversion rate.
The course of work of improving the full gloss appearance of based semiconductor image intensifer polarization rotation effect linearity method of the present invention is (as shown in Figure 2): the input end input repetition frequency at the input optical fibre 1 of full gloss appearance system is f
sSmall-signal sampled light pulse train, be provided with in the input optical fibre 3 that to keep luminous power be a desired value, make the interval [P of the simulating signal optical power change of sampling transmission curve in input optical fibre 2
l, P
h] in have the favorable linearity characteristic, input simulating signal light time to be sampled in input optical fibre 2, obtain the light pulse that luminous power receives the modulation of input simulating signal light property from the output terminal of output optical fibre 5, thereby realize optimization the full gloss appearance linearity.
Essence of the present invention is exactly to consume the charge carrier on part TE and the TM direction through the maintenance light that injects appropriate light power; Thereby influence the gain and the phase differential of TE and TM pattern; Suppressed the nonlinear distortion relevant, thereby accomplished optimization the sampling system linearity with gain fluctuation.
The advantage of invention or positive effect:
The method of the optimization sampling linearity that the present invention proposes has avoided in semiconductor optical amplifier, introducing complicated gain blocked structure; The nonlinear distortion that has suppressed semiconductor optical amplifier; Improve the linearity of full gloss appearance, enlarged the dynamic range of being adopted the bar light signal.And easy to operation, can realize dynamic control through regulating the power that injects maintenance light to the sampling linearity.
Description of drawings
Fig. 1 is the full sampling system principle schematic through optimizing
Wherein 1 is the sampling pulse light input end, and 2 is the simulating signal light input end, and 3 for keeping light input end, and 4 is system's light output end.
Fig. 2 is full gloss appearance system architecture synoptic diagram
Wherein 1 is that sampling light pulse input optical fibre, 2 is to be maintenance light input optical fibre by sampled analog flashlight input optical fibre, 3, and 4 is the input electrode of semiconductor optical amplifier 8, and 5 is output optical fibre; 6 is first Polarization Controller; 9 is second Polarization Controller, and 7 is coupling mechanism, and 8 is semiconductor optical amplifier; 10 is optical band pass filter, and 11 is polarization beam combiner.
To be full gloss appearance system keep light and inject the sampling transmission curve synoptic diagram that different capacity keeps the light time injecting Fig. 3.
Fig. 4 is the light pulse signal synoptic diagram behind the full gloss appearance systematic sampling.
1 is output sampling pulse enveloping curve, and 2 is one of them sampling pulse.
Embodiment
The method of improving the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity that proposes through instance simulation value simulating, verifying the present invention to full gloss sampling device as shown in Figure 2 system.Institute in steps, conclusion all on matlab 7.0 checking correct.
The full gloss appearance system of step 1 constitutes
Step 2a: confirm the working current 550mA of semiconductor optical amplifier 5, maximum input optical power 10mW and by the variable power scope of sampled signal light [0.2mW 0.9mW] from the technical descriptioon file of semiconductor optical amplifier 8;
Step 2b: input electrode 4 input intensities at semiconductor optical amplifier 8 are the working current of 550mA, and the small-signal continuous light of input optical power 0.1mW in input optical fibre 1 is medium-sized little in the measurement of output end light merit of output optical fibre 5;
Step 2c: the ducting layer angle theta of the polarization direction of first Polarization Controller 6 and semiconductor optical amplifier 8
aBe made as 45 degree, the ducting layer angle β of the light transmission shaft of polarization beam combiner 11 and semiconductor optical amplifier 8 is made as 45 degree, and input optical wavelength in centre wavelength to the input optical fibre 1 of adjustment optical band pass filter 10 leaches the small-signal continuous light in the optical fiber 1.Adjust the ducting layer angle theta of second Polarization Controller, 9 polarization directions and semiconductor optical amplifier 8
b, be TE mould and the additional θ that differs of TM mould introducing
PcBe 100 degree, make from the luminous power of output optical fibre 5 outputs minimum;
Near step 2d: the polarization direction of adjustment first Polarization Controller 6 and the ducting layer angle theta of semiconductor optical amplifier 8 45 degree
aBe 30 when spending, the Output optical power in the output optical fibre 5 is zero;
Step 2e: input optical power P in input optical fibre 2
sGreater than the continuous light of 0.2mW, change P less than 0.9mW
sSize, at the output terminal of output optical fibre 5 record Output optical power, do not injected the transmission curve that the Output optical power that keeps the light time changes with input optical power;
Step 2f: the continuous light of input optical power 0.5mW in input optical fibre 3, the process of repeating step 2c～e obtains injecting the sampling transmission curve that 0.5mW keeps the light time.Change and be input to the maintenance light luminous power P in the optical fiber 3
bSize, make it to be 1mW, the process of repeating step 2c～e obtains injecting the sampling transmission curve that 1mW keeps the light time, obtains 3 sampling transmission curves, and is as shown in Figure 3;
Observable these 3 transmission curves, it is very high to inject the transmission curve conversion efficiency of maintenance light time, but the linearity is relatively poor; The transmission curve linearity when keeping luminous power to be 1mW is fine, but conversion efficiency is lower; In order to obtain the good transmission curve of the linearity, guarantee high conversion rate simultaneously, so compromise is chosen performance number 0.5mW as the luminous power in the input optical fibre 3.
The realization of the full gloss appearance of step 4
Step 4a: the working current that semiconductor optical amplifier 8 is set is 550mA, and the maintenance luminous power in the input optical fibre 3 is 0.5mW, and power input is the simulating signal light of 500MHz less than 0.9mW, frequency greater than 0.2mW in input optical fibre 2 simultaneously;
Step 4b: the input end input repetition frequency at the input optical fibre 1 of electro optic sampling system is 10GHz; Peak power is the sampled light pulse of 0.1mW; Output terminal at output optical fibre 5 obtains the light pulse that luminous power changes with the input signal intensity as linear; Thereby accomplished full gloss appearance, realized improvement simultaneously the sampling linearity.
Just accomplished optimization through above step, for example do not injected the maintenance light time, the second harmonic distortion D of output signal the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity
2=0.2813, third harmonic distortion D
3=0.0244, four-time harmonic distortion D
4=0.0066, conversion efficiency E
f=3.4486; When keeping luminous power to be 0.5mW, second harmonic distortion D
2=0.1529, third harmonic distortion D
3=0.0124, four-time harmonic distortion D
4=0.0031, conversion efficiency E
f=2.3706; When keeping luminous power to be 1mW, second harmonic distortion D
2=0.0510, third harmonic distortion D
3=0.0042, four-time harmonic distortion D
4=0.0012, conversion efficiency E
f=1.2746; It is thus clear that suitably improving the maintenance luminous power is fairly obvious to the effect of improving the sampling system linearity.
The real-time unperturbed measurement of optical analog-to-digital converter of future generation, hypervelocity electronic device characteristics needs miniaturization, integrated, hypervelocity and the little full optical sampler part of nonlinear distortion.The nonlinear distortion of sampling system is the key factor of restriction A/D conversion accuracy.Therefore, the method for improving the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity that the present invention proposes can play strong impetus for the conversion accuracy that improves optical analog-to-digital converter of future generation, be with a wide range of applications.
Claims (1)
1. the present invention proposes a kind of method of improving the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity, it is characterized in that it comprises following steps:
The full gloss appearance system of step 1 constitutes
Full gloss appearance system is by input optical fibre (1), input optical fibre (2), input optical fibre (3); First Polarization Controller (6), coupling mechanism (7), semiconductor optical amplifier (8); Second Polarization Controller (9), optical band pass filter (10), polarization beam combiner (11) and output optical fibre (5) connect and compose through light successively;
Confirming of step 2 optics running parameter
Step 2a: confirm the working current I of semiconductor optical amplifier (8), maximum input optical power P from the technical descriptioon file of semiconductor optical amplifier (8)
m, by the variable power scope [P of sampled signal light
l, P
h];
Step 2b: input electrode (4) input intensity in semiconductor optical amplifier (8) is the working current of I, and input optical power is P in input optical fibre (1)
pThe small-signal continuous light, guarantee P simultaneously
pLess than P
l, in the measurement of output end luminous power size of output optical fibre (5);
Step 2c: be made as 45 degree to the ducting layer angle theta a of the polarization direction of first Polarization Controller (6) and semiconductor optical amplifier (8); The ducting layer angle β of the light transmission shaft of polarization beam combiner (11) and semiconductor optical amplifier (8) is made as 45 degree; Input optical wavelength in centre wavelength to the input optical fibre (1) of adjustment optical band pass filter (10); Leach the small-signal continuous light in the optical fiber (1), adjust the ducting layer angle theta of second Polarization Controller (9) polarization direction and semiconductor optical amplifier (8)
bThereby, be TE mould and the additional Φ that differs of TM mould introducing
Pc, make from the luminous power of output optical fibre (5) output minimum;
Near step 2d: the polarization direction of adjustment first Polarization Controller (6) and the ducting layer angle theta of semiconductor optical amplifier (8) 45 degree
a, record θ when the luminous power in the output optical fibre (5) is zero
a, θ
bValue with β;
Step 2e: by the variable power scope [P of sampled analog flashlight
l, P
h] the interior middle input optical power P of input optical fibre (2) that changes
s, the output terminal record Output optical power at output optical fibre (5) is not injected the transmission curve of the Output optical power of maintenance light time with the input optical power variation;
Step 2f: input optical power is P in input optical fibre (3)
bContinuous light, guarantee P simultaneously
bLess than P
m, the process of repeating step 2c～e obtains keeping the fashionable sampling transmission curve of light beam, changes to be input to the maintenance light luminous power P in the optical fiber (3)
bSize, the process of repeating step 2c～e obtains injecting some the sampling transmission curves that different capacity keeps the light time;
Step 3 is injected and is kept confirming of luminous power
Observable some transmission curves, compromise are chosen a sampling transmission curve wherein, make it at [P
l, P
h] internal linear degree and conversion efficiency all meet the requirements, the pairing luminous power of this curve is the maintenance luminous power in the input optical fibre (3);
The realization of the full gloss appearance of step 4
Step 4a: the working current I of semiconductor optical amplifier (8) and the maintenance luminous power P in the input optical fibre (3) are set
b, simultaneously in input optical fibre (2) power input at [P
l, P
h] in, frequency is f
vSimulating signal light;
Step 4b: the input end input repetition frequency at the input optical fibre (1) of full gloss appearance system is f
s, peak power is P
pThe sampled light pulse, obtain the light pulse that luminous power changes with the input signal intensity as linear at the output terminal of output optical fibre (5), thereby, realized improvement simultaneously the sampling linearity complete accomplished gloss appearance;
Just accomplished optimization through above step to the full gloss appearance of the based semiconductor image intensifer polarization rotation effect linearity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155721A (en) * | 2014-09-02 | 2014-11-19 | 中国科学院半导体研究所 | Optical sampling system based on quantum dot mode-locked laser devices |
| CN106602403A (en) * | 2017-02-28 | 2017-04-26 | 太原理工大学 | Method and device for realizing low-power all-optical quantization based on micro-nano resonant cavity |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482579A (en) * | 2008-12-26 | 2009-07-15 | 电子科技大学 | Electro-optical sampling method based on polarization rotation effect of semiconductor optical amplifier |
| CN101539591A (en) * | 2009-04-16 | 2009-09-23 | 电子科技大学 | Electro-optic sampling method based on polarization rotation effect of electroabsorption modulator |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482579A (en) * | 2008-12-26 | 2009-07-15 | 电子科技大学 | Electro-optical sampling method based on polarization rotation effect of semiconductor optical amplifier |
| CN101539591A (en) * | 2009-04-16 | 2009-09-23 | 电子科技大学 | Electro-optic sampling method based on polarization rotation effect of electroabsorption modulator |
Non-Patent Citations (1)
| Title |
|---|
| H. J. S. DORREN, DAAN LENSTRA,YONG LIU,ET.AL: "《Nonlinear Polarization Rotation in Semiconductor Optical Amplifiers: Theory and Application to All-Optical Flip-Flop Memories》", 《IEEE JOURNAL OF QUANTUM ELECTRONICS》, vol. 39, no. 1, 31 January 2003 (2003-01-31), pages 141 - 148 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155721A (en) * | 2014-09-02 | 2014-11-19 | 中国科学院半导体研究所 | Optical sampling system based on quantum dot mode-locked laser devices |
| CN104155721B (en) * | 2014-09-02 | 2016-09-14 | 中国科学院半导体研究所 | Optical Sampling system based on quantum dot mode-locked laser |
| CN106602403A (en) * | 2017-02-28 | 2017-04-26 | 太原理工大学 | Method and device for realizing low-power all-optical quantization based on micro-nano resonant cavity |
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