A method and device for equal optical path difference processing

Abstract

The invention discloses a processing method and device for equal optical path difference, wherein the method includes: connecting the four optical fibers of the optical mixer with the two I-channel optical fibers of the first detector and the The two Q-path optical fibers of the second detector are fused; the optical path difference between the I-path optical fiber and the Q-path optical fiber is measured by an oscilloscope; the two Q-path optical fibers are cut according to the optical path difference and then Secondary fusion splicing, so that the difference between the length of the Q optical fiber and the length of the I optical fiber is within an error range. The equal optical path difference processing method disclosed in the present invention can accurately test the optical path difference between the I-path optical fiber and the Q-path optical fiber, and after the optical path difference is calculated, the longer Q-path optical fiber is processed by a secondary fusion splicing process, so that The length of the Q optical fiber is substantially equal to the length of the I optical fiber.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method and a device for equal optical path difference processing. Background technique [0002] In the laser BPSK (Binary Phase Shift Keying, Binary Phase Shift Keying) coherent demodulation communication system, the block diagram of the coherent demodulation module is as follows figure 1 shown. The optical mixer is the core component of the coherent demodulation module. Its function is to mix the local oscillator light with the same polarization direction and similar or the same frequency with the signal light to obtain the phase information of the signal light. One optical signal and the local oscillator optical signal enter from the optical mixer, and the optical signal is demodulated by the phase shifting method. The optical mixer outputs two sets of I and Q optical signals, and the Q optical signal is a phase shift of the optical signal by 90 °, it is r...

AI Technical Summary

Problems solved by technology

However, in optical communication, the optical devices are interconnected through the method of optical fiber fusion, and the fusion point of the optical fiber cannot be disconnected after fusion, and the cross-connection test cannot be performed.

If the cross-connection test is performed after disconnection, the length of the optical fiber will change and there is no reference point. Therefore, the above-mentioned direct and cross-connection test cannot be performed, and only a new measurement method can be used for testing.

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