Optical generation device and method for phase coding signal with tunable multiplication factor

Abstract

The invention relates to an optical generation device and method for a phase coding signal with a tunable multiplication factor. The device comprises a laser, a DP-QPSK modulator, a microwave signal generator, an electric amplifier, a coding signal generator, a direct current power, a polarization controller, a polarizer, an optical amplifier, and a photo detector. The method comprises the step ofgenerating binary phase coding signals with different multiplication factors according to needs by using a non-linear modulation characteristic of the DP-QPSK modulator, wherein the multiplication factors can be any one of one to four, and the frequencies of the generated signals are tuned by adjusting the frequency of an input microwave signal. The device is based on an integrated modulator structure, has a simple system, has stable performance, overcomes defects that a traditional manner of generating a pulse compression signal in the frequency domain is limited by the rate and bandwidth ofan electronic device, has difficulty in generating a high-frequency signal or cannot generate the high-frequency signal and the generated signal cannot be tuned flexibly in frequency, greatly improves the frequency of generating the phase coding signal, and can produce phase coding signals with very large frequency tuning range.

Description

technical field [0001] The invention belongs to the technical field of microwave signal generation, and in particular relates to an optical generation device and method for a phase encoding signal with adjustable frequency multiplication factor. Background technique [0002] In the radar system, in order to make the radar signal have a long range and have high ranging and speed measurement accuracy and good distance and speed resolution, the first transmission signal needs to be in the form of large bandwidth and long pulse, that is, the radar signal should have large The time-bandwidth product of . The traditional constant carrier frequency pulse radar, because the carrier frequency is constant, its time-bandwidth product is constant and does not exceed 1, which makes it difficult for the constant carrier frequency pulse radar to simultaneously take into account the operating range, ranging speed measurement accuracy and range speed resolution. [0003] In order to solve t...

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Problems solved by technology

For example, the generation of pulse compression signals can be realized by optical spectrum shaping and frequency domain to time domain mapping, but the signal time length generated by this method is limited, often less than 1 microsecond, which limits the scope of use of this method

The method based on external modulation can generate long-term phase-encoded signals. For example, the method of generating binary phase-encoded signals based on a single polarization modulator has been reported in relevant literature. This method has a simple structure, but it can only generate The phase-encoded signal with a multiplication factor of up to two; the binary phase-encoded signal generation method based on a single Mach-Zehnder modulator is also based on a single modulator, but only the binary phase-encoded signal of the fundamental frequency can be generated; based on polarization multiplexing dual parallel The method of Mach-Zehnder modulator plus balanced detector can generate a quadrupled frequency binary phase-encoded signal, but due to the use of a balanced detector, the complexity and implementation cost of this method are relatively high; related literature also reported a polarization-based Multiplexed dual parallel Mach-Zehnder modulator plus polarization modulator multiplication factor in two, four, eight adjustable binary phase encoding signal generation method, although the method can achieve tunable multiplication factor, but need to use two An optical modulator causes complex system and high cost. In addition, when the frequency multiplication factor is eight, optical filter filtering is required, which will limit the system stability and frequency tunable range of this method, and make the structure of this method more complicated at the same time.

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