Optical device frequency response measurement method and device

Abstract

The invention discloses a method for measuring the frequency response of an optical device, which divides a linear frequency modulated continuous optical signal into two channels, one channel introduces a fixed frequency shift Δω, and the other channel performs delay matching to ensure that the instantaneous frequency difference of the two channels of optical signals is always constant; The two lines of linear frequency modulated continuous optical signals are coupled and divided into two paths, one path is photoelectrically converted into the measurement circuit electrical signal after passing through the optical device to be measured, and the other path is directly photoelectrically converted into the reference circuit electrical signal; The Δω component is used as a reference to extract the amplitude and phase information of the Δω component in the measurement circuit signal, thereby obtaining the amplitude response and group delay response of the optical device to be measured at the sampling point. The invention also discloses an optical device frequency response measuring device. Compared with the prior art, the present invention can greatly improve the measurement speed and reduce the performance requirements for hardware.

Description

technical field [0001] The invention relates to a method for measuring the frequency response of an optical device, and belongs to the technical field of optical device measurement. Background technique [0002] The spectral response of optical devices is a key parameter to reveal the characteristics of materials and systems of microwave photonic devices, and it is also an important basis for guiding the realization of functions of microwave photonic devices in various applications. In recent years, with the rapid development of laser technology, photonic systems have been widely used in the new generation of high-speed optical fiber communication systems, backbone transmission, airborne and shipborne optical transmission control systems, optically controlled phased array radar systems and optoelectronic weapon equipment systems. , which puts forward higher requirements for the testing of high-speed optical / electrical and electrical / optical converters, fiber amplifiers, lase...

AI Technical Summary

Problems solved by technology

[0004] However, the measurement method of optical devices based on SSB modulation also has serious deficiencies

First of all, the generation of optical SSB will make the system very complicated. At present, the generation methods of SSB modulation are roughly divided into filtering method and 90° phase shift method. The former requires the use of filters, which increases the complexity and instability of the system. And the extinction ratio is limited; the latter requires a 90° phase shift of the microwave signal loaded to the dual-drive optoelectronic modulator, which requires the use of a broadband 90° bridge and a dual-drive optoelectronic modulator, the system is complex and inconvenient to adjust

Secondly, the SSB frequency sweep method is a point-by-point measurement, and the measurement speed is slow

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