A Broadband High Resolution Spectral Response Measurement Method

Abstract

The invention proposes a broadband high-resolution spectral response measurement system and method, which belong to the field of spectral response measurement and microwave photonics, and are used to solve the problems of narrow measurement range, low measurement resolution and only band-blocking optical devices in existing methods. question. The specific technical solution is: the optical carrier emitted by the fine-step adjustable light source enters the dual-parallel Mach-Zehnder modulator, and the fine-step RF source is combined with a microwave 90° coupler to obtain two RF signals, which are respectively input into the upper and lower sub-modulators , the bias voltage is adjusted by a bias control circuit to generate a carrier-suppressed single-sideband signal. The signal is divided into upper and lower optical signals through a 50:50 polarization maintaining coupler, and the upper path passes through the device under test and then enters the photodetector; after the lower path passes through a 1:99 polarization maintaining coupler, 1% of the signal enters the bias as feedback information Control circuit, 99% of the signal goes to the photodetector. The control and signal acquisition circuit performs balanced detection on the two input electrical signals, so as to obtain the spectral response of the device under test.

Description

technical field [0001] The invention proposes a broadband high-resolution spectral response measurement method, which belongs to the fields of spectral response measurement and microwave photonics. Background technique [0002] With the rapid development of my country's electronic countermeasures, radar systems, satellite remote sensing, broadband wireless communications, and astronomical detection and other application fields, the requirements for the characteristics of optical devices for building systems are getting higher and higher. Correspondingly, the measurement range and The requirements for measurement accuracy are also getting higher and higher. However, the measurement accuracy of existing technologies is generally low. Taking optical filters as an example, it is difficult to use existing technologies to measure optical devices with extremely narrow bandwidths, which cannot meet actual needs. [0003] APEX company has developed OCSA multi-functional spectrum anal...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing methods, such as narrow measurement range, low measurement resolution and only being able to measure band-blocking optical devices, the present invention proposes a broadband high-resolution spectral response measurement method

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