Method for obtaining optical path difference of optical switch and device

Abstract

The invention relates to a method for obtaining optical path difference of an optical switch and a device. The proposal thereof is as follows: firstly an input electric signal provided by a vector network analysis module is modulated on an optical carrier by electric light to obtain an optical signal; then the optical signal is switched to an access by the optical switch, and a path of optical fiber transmission signal is obtained by combined light; the optical fiber transmission signal are demodulated by photoelectricity and then the group delay of the two accesses in the optical switch is obtained by vector network analysis; and finally the group delay of the two accesses is switched to obtain the optical path difference of the two accesses in the optical switch. The invention realizes the measurement of little optical path difference in the optical switch, thus improving the delay precision of an implementation system of the optical switch of the OTTD technology.

Description

technical field [0001] The invention relates to a photoelectric detection technology, in particular to a method and a device for obtaining the optical path difference of an optical switch. Background technique [0002] At present, OTTD (Optical True Time Delay, optical real-time delay line) technology mainly uses optical switches to control arrays of different fiber lengths to realize optical real-time delay. Other delay indicators such as time, isolation, and insertion loss are mainly determined by optical switches, so the performance of optical switches is also a major factor in the performance of OTTD technology. Especially in precise delay or phase control systems, the required accuracy is on the order of picoseconds or sub-picoseconds, and the optical path difference of optical switches is generally on the order of picoseconds. In this case, the optical path difference of optical switches cannot Neglected, but at present, optical switch manufacturers only provide conve...

AI Technical Summary

Problems solved by technology

Especially in precise delay or phase control systems, the required accuracy is on the order of picoseconds or sub-picoseconds, and the optical path difference of optical switches is generally on the order of picoseconds. In this case, the optical path difference of optical switches cannot Neglected, but at present, optical switch manufacturers only provide conventional indicators such as wavelength range, insertion loss, crosstalk, etc., and cannot provide optical path difference indicators of optical switches

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