Optoelectronic oscillator based on multilayer film echo wall mode optical microcavity

Abstract

The invention discloses an optoelectronic oscillator based on a multilayer film echo wall mode optical microcavity. A closed optoelectronic feedback loop consists of a laser (1), a polarization controller (2), a Mach-Zehnder intensity modulator (3), an RF amplifier (4), a filter (5), an optoelectronic detector (6), a multilayer film echo wall mode optical microcavity (7) and a laser frequency-locking module (8); and the closed optoelectronic feedback loop is the main structure of the optoelectronic oscillator. The optoelectronic oscillator provided by the invention can effectively reduce influence on the generated microwave frequency from temperature fluctuations and other external environment factors, and high-quality and steady microwave signals can be obtained; meanwhile, the signal noise can be weakened; and furthermore, the optoelectronic oscillator is small in size, light in weight, and easy to package and integrate.

Description

technical field [0001] The invention belongs to the technical field of microwave and optoelectronics, and in particular relates to a photoelectric oscillator based on a multilayer film whispering gallery mode optical microcavity. Background technique [0002] An optoelectronic oscillator (OEO) is a high-quality microwave generating device, which has important applications in frequency synthesis, communication systems, navigation systems, and especially in the fields of microwave photonics. The traditional long-fiber-based optoelectronic oscillator was first proposed by Lute Maleki et al. in 1994. This OEO uses several kilometers of long optical fiber for energy storage, with small loss (0.2dB / km) and low phase noise (-140dBc / Hz) , which breaks through the limitation that the phase noise of the traditional microwave generator increases with the increase of frequency. Despite the above advantages, long optical fiber OEO still has a series of defects: (1) It is easily affected...

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Problems solved by technology

Despite the above advantages, long optical fiber OEO still has a series of defects: (1) It is easily affected by external mechanical vibration and temperature fluctuation; (2) It is bulky and heavy, which brings a lot of inconvenience to the application of optoelectronic oscillators in the aerospace field; ( 3) The ring cavity mode generated by the fiber delay line will generate a large number of spurious modes with small frequency intervals, and these small spurious modes are difficult to be filtered out by RF filters

However, there are still some problems in the OEO based on the optical microcavity that has been proposed. Since the generated microwave oscillation frequency corresponds to the FSR of the whispering gallery mode microcavity, temperature fluctuations will affect the FSR of the microcavity and cause the output microwave frequency to be unstable.

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