Frequency and wavelength dual-tunable frequency modulation continuous wave optical carrier signal generation system

Abstract

The invention discloses a frequency and wavelength dual-tunable frequency modulation continuous wave optical carrier signal generation system, including a signal generator, a tunable laser, an optical signal amplifier, a filter and an array waveguide grating which are connected in sequence. The signal generator is used for generating low-frequency modulation continuous waves for modulating the laser; the tunable laser outputs spectral signals after intensity modulation and phase modulation according to the received low-frequency modulation continuous waves; the optical signal amplifier is used for amplification processing of the spectral signals; the filter is used for filtering two spaced optical sidebands among the amplified spectral signals, thereby obtaining high-frequency modulation continuous wave optical carrier signals; and the array waveguide grating is used for outputting the high-frequency modulation continuous wave optical carrier signals. The system provided by the invention generates the high-frequency modulation continuous wave signals, and has the characteristics and advantages of central frequency and wavelength dual tenability, simple structure and easy expansion.

Description

technical field [0001] The invention relates to the generation of frequency-modulated continuous wave signals, in particular to a frequency-modulated continuous-wave optical carrier signal generation system with double tunable frequency and wavelength. Background technique [0002] Chirp continuous wave or linearly chirped signals are widely used in modern radar systems, medical imaging, radio frequency communications and other fields. Due to the limitation of electronic bottlenecks in traditional signal generation based on electrical methods and devices, the working center frequency is difficult to reach the microwave and millimeter-wave frequency bands, and its bandwidth is also greatly limited, which can no longer meet the needs of modern high-resolution radar applications. Compared with the electrical method, the FM CW generation based on the optical method has the great advantages of high frequency and wide bandwidth. Moreover, considering that microwave and millimeter...

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Problems solved by technology

However, the system generally uses modulation devices such as intensity modulators or phase modulators, and the design of the optical harmonic structure is complex. On the one hand, its performance is affected by the external modulator, and on the other hand, additional insertion loss is introduced.

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