Mode hopping suppression method and system for opto-electronic oscillator

A technology of photoelectric oscillator and reference oscillator, which is applied in the field of microwave photonics, can solve problems such as mode hopping, cavity mode frequency change, phase-locked loop loss of lock, etc., to overcome phase-locked loop loss of lock and reduce power consumption and volume, reducing complexity and cost

Active Publication Date: 2019-11-08
PEKING UNIV +1
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  • Application Information

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Problems solved by technology

However, due to the change of the optical fiber in the optoelectronic oscillator with the temperature, the frequency of

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  • Mode hopping suppression method and system for opto-electronic oscillator
  • Mode hopping suppression method and system for opto-electronic oscillator
  • Mode hopping suppression method and system for opto-electronic oscillator

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Embodiment Construction

[0035] The solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] The scheme system framework of the present invention is as figure 1 shown. The system contains two oscillators and two feedback control loops. The two oscillators are low-frequency reference oscillator and double-loop structure point-frequency photoelectric oscillator; the two feedback control loops are frequency control loop and phase-locked loop. Through two feedback loops, the phase synchronization of the reference oscillator and the double-loop structure point-frequency optoelectronic oscillator is finally realized. The frequency of the double-ring structure point-frequency optoelectronic oscillator can be tuned step by step by changing the length of the short-ring cavity in the oscillation loop. The minimum step is the long-ring cavity-mode interval frequency of the optoelectronic oscillator. The cavity length of the loop long ...

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Abstract

The invention discloses a mode hopping suppression method and system for an opto-electronic oscillator. The method comprises steps: a phase frequency detector compares an output signal of a low frequency reference oscillator with a signal of a double-loop structure point frequency opto-electronic oscillator through frequency division of a frequency divider, and if the frequency difference betweenthe two exceeds the maximum traction range of a phase locked loop, a frequency control loop is triggered to start working; a frequency control loop generates a control signal and sends the control signal to a voltage-controlled radio frequency phase shifter in a short loop of the double-loop structure point frequency opto-electronic oscillator, the oscillation frequency of the double-loop structure point frequency opto-electronic oscillator is tuned until the frequency difference of output signals between the low frequency reference oscillator and the frequency divider falls in the traction frequency range of the phase locked loop, the frequency control loop is triggered to stop working. Mode hopping and frequency drift suppression on the double-loop structure point frequency opto-electronic oscillator can be realized based on one frequency control loop and the phase locked loop, and long-term stability of the oscillation frequency is achieved.

Description

technical field [0001] The invention relates to a mode hopping suppression method and system suitable for a photoelectric oscillator. The system uses a frequency control loop and a phase-locked loop to realize the phase locking between the photoelectric oscillator and the reference oscillator, which overcomes the mode hopping caused by the photoelectric oscillation loop due to environmental temperature, vibration and other factors, and belongs to the field of microwave photonics. Background technique [0002] The optoelectronic oscillator is a new type of microwave oscillator capable of generating high-frequency microwave and millimeter-wave signals. It has the characteristics of extremely low phase noise, phase noise is almost independent of frequency, and frequency broadband can be tuned. It has important application value in many fields such as high-performance radar systems, broadband wireless communication systems, broadband test systems, and deep space exploration. In...

Claims

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Application Information

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IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 彭焕发陈章渊郭锐徐永驰杜华阳
Owner PEKING UNIV
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