Orthogonal polarization modulated opto-opto 2-4 level coding conversion method and system based on semiconductor optical amplifier

Abstract

The invention relates to an orthogonal polarization modulated light-light 2-4 level coding conversion method and system based on a semiconductor optical amplifier. The method is that two 2-level light intensity modulated signals are orthogonal polarization combined and reversely or co-directionally inputted into the SOA together with the modulated signal light to achieve the 4-level intensity modulated coding conversion of the signal light. The system is that 2-level light intensity modulated signals are respectively connected into an optical orthogonal polarization coupler through a polarization controller, and then reversely or co-directionally connected into the SOA together with the modulated signal light through a polarization controller; the modulated optical signal is connected into the SOA through a polarization controller; the light outputted by SOA outputs a 4-level modulated signal through an optical filter. The invention simplifies the complexity of the system and directly outputs linearly polarized light, which achieves equidistant spacing power output by adjusting the modulation signal power ratio and realizes dynamic output range adjustment by regulating the work current of the SOA.

Description

technical field [0001] The present invention relates to a method and system for an all-optical information processing device, in particular to a conversion method and system for realizing all-optical 2-level light intensity coding modulation to 4-level light intensity coding modulation by utilizing the polarization modulation effect of a semiconductor optical amplifier . Background technique [0002] All-optical network and all-optical information processing are the goals of optical communication and even communication and information processing. Therefore, all-optical information processing and light-to-light direct conversion are currently research hotspots in the field of optical communication. In the communication system, in order to improve the transmission efficiency of information, the method of multi-level modulation can be used to improve the transmission code rate. In two-level modulation, the high and low levels represent "1" and "0" codes respectively, while in...

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Problems solved by technology

(2) The two-way 2-level modulation signals enter the SOA along the TE and TM modes, and the mutual gain modulation of the modulated signal light in the TE mode is different.

[0007] Utilize the polarization modulation effect of SOA to realize the conversion of 2-4 light multi-level modulation, and its difference with the present invention is: (1) require two-way 2-level input signal light to inject SOA in the same direction by polarization multiplexing; (2) The ratio of the power of the input signal to the optical signal needs to satisfy a relatively large proportional relationship, so the signal at the input end needs optical amplification; (3) An analyzer needs to be added at the output end; (4) Due to the output of the polarization analyzer, the incident modulation and the received The change of the interference phase difference between the TE and TM modes in the SOA caused by the change of the light intensity of the modulation signal will lead to the change of the modulation curve

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