Method for improving full light sampling linearity based on semiconductor light amplifier polarization rotation effect
An optical amplifier and polarization rotation technology, which is applied in the field of optoelectronics, can solve the problems of reducing the optical gain nonlinearity of semiconductor optical amplifiers, not being suitable for semiconductor optical amplifiers, and complicated production processes, so as to suppress nonlinear distortion, expand dynamic range, The effect of easy operation
Inactive Publication Date: 2013-06-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The characteristic that the optical gain of the semiconductor optical amplifier presents a nonlinear change to the input optical power is an important factor that produces nonlinear distortion. Gain-clamped structures can be introduced into the semiconductor optical amplifier to control the carrier concentration modulation effect. Reduce the nonlinearity of the optical gain of the semiconductor optical amplifier (see the literature 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), the gain clamping structure includes several types such as distributed feedback structure, distributed Bragg reflector structure, fiber Bragg grating structure and ring cavity structure, and the production process for realizing these structures is complex , the cost is high, and it is not suitable for the application of general semiconductor optical amplifiers
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[0041] through the pair such as figure 2 An example of the plenoptic sampling device system shown is simulated and numerically simulated to verify the method proposed by the present invention to improve the linearity of plenoptic sampling based on the polarization rotation effect of the semiconductor optical amplifier. All steps and conclusions are verified on matlab 7.0.
[0042] Step 1 Composition of all-optical sampling system
[0043] Step 2a: From the technical description document of the semiconductor optical amplifier 8, determine the working current of the semiconductor optical amplifier 5 of 550mA, the maximum input optical power of 10mW, and the power variation range of the sampled signal light [0.2mW to 0.9mW];
[0044] Step 2b: Input a working current with an intensity of 550mA at the input electrode 4 of the semiconductor optical amplifier 8, input a small-signal continuous light with an optical power of 0.1mW in the input optical fiber 1, and measure the half si...
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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 andconvenient, 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 [0001] The invention belongs to the field of optoelectronic technology, the field of integrated optics and the field of photoelectric signal processing, and particularly relates to a method for improving the linearity of polarization rotation all-optical sampling based on a semiconductor optical amplifier. Background technique [0002] The all-optical sampling technology based on the polarization rotation of the semiconductor optical amplifier (SOA) is a signal conversion technology of optical control (see the literature Zhang Shangjian, Zhang Qian, Li Heping, etc. All-optical sampling based on the nonlinear polarization rotation effect of the semiconductor optical amplifier[J]. Semiconductor Acta Sinica, 2008, 29(6): 1031-1035), using the modulation effect of analog signal light on the carrier concentration and gain in the semiconductor optical amplifier, the polarization state of the sampling pulse light is rotated, and the pulse The polarization state modu...
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IPC IPC(8): G02F7/00G02F1/35G01D5/28
Inventor 张尚剑张衎包小斌叶胜威陆荣国刘永刘永智
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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