Bias-voltage-control-based adjustable instantaneous frequency measure system

Abstract

The invention, which relates to the field of the microwave photonics, provides a bias-voltage-control-based adjustable instantaneous frequency measure system. A first continuous wave laser (11) and a second continuous wave laser (12) are respectively connected with a first polarization controller (21) and a second polarization controller (22); the first polarization controller (21) and the second polarization controller (22) are respectively connected with a polarization beam splitter (3); the polarization beam splitter (3) is connected with a third polarization controller (23); the third polarization controller (23), a radio frequency signal source (5) and a bias voltage source (6) are connected to a light input terminal (41), a radio frequency input terminal (42), and a bias input terminal (43) of a polarization modulator (4); the output of the polarization modulator (4) is connected with a fourth polarization controller (24) connected with a wire grid polarizer (7); and the wire grid polarizer (7) is connected with a single-mode fiber (8) and a wavelength division multiplexing device (9) is used for carrying out shunting. A first photoelectric detector and a second photoelectric detector (101 and 102) respectively detect separated two paths of signals and output the signals to a first input terminal and a second input terminal (131 and 132) of an electric treatment module (13), thereby obtaining an amplitude comparison function.

Description

technical field [0001] The utility model relates to the field of microwave photonics, in particular to an adjustable instantaneous frequency measurement system controlled by a bias voltage. Background technique [0002] Applying microwave photonics, which has important advantages such as large bandwidth, low loss and anti-electromagnetic interference, to the field of instantaneous microwave frequency measurement (IFM, instantaneous frequency measurement), can greatly improve the performance of the instantaneous frequency measurement system. Therefore, based on microwave photonics In recent years, the instantaneous frequency measurement method has attracted more and more attention from domestic and foreign scholars. When designing an instantaneous frequency measurement system, it is often necessary to consider the following factors: 1. It has a large and adjustable measurement range; 2. Improve the measurement accuracy as much as possible; 3. Ensure that the system has strong...

AI Technical Summary

Problems solved by technology

In this type of method, most schemes face a trade-off problem: high precision and large measurement range cannot be obtained at the same time, and only one of the two can be used

But the tradeoffs are not well resolved

Moreover, it is difficult to adjust the polarization angle in actual operation. Therefore, it is necessary to design an instantaneous frequency measurement system with simple bias voltage control and improved accuracy.

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