Method for obtaining optical path difference of optical switch and device

An optical switch, optical path difference technology, applied in the direction of testing optical performance, etc., can solve the problem that the optical switch optical path difference index cannot be provided.
CN101539474AInactive Publication Date: 2009-09-23BEIHANG UNIV
0 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More