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首次提出采用二次注入锁定的方案来实现低相噪光电振荡器的设计,通过注入锁定长光纤环光电振荡器来实现单模、低相噪的振荡信号,并以之为二次注入源,注入锁定另一长光纤环光电振荡器,通过该方案进一步提高注入源稳定性,最终实现超低相噪的振荡信号.实验表明,通过一次注入锁定,X波段光电振荡器的相位噪声在10 kHz频偏由-121 dBc/Hz降低到-135 dBc/Hz,二次注入后下降到-146 dBc/Hz,目前国内无如此高指标报道,接近美国海军实验室报道指标.为推进光电振荡器走向实用阶段,基于锁相原理设计了一种新型的稳定性控制电路并进行了相关实验,验证了该电路的有效性.
It is the first time to propose a scheme of secondary injection locking to realize the design of low phase noise electro-optical oscillator. By injecting and locking the long fiber ring electro-optic oscillator, single-mode and low-phase noise oscillating signal can be realized and used as secondary injection source. Injecting and locking another long optical fiber ring electro-optic oscillator, through which the injection source stability is further improved and finally the ultra-low phase noise oscillation signal is obtained.The experiment shows that the phase noise of the X-band electro-optic oscillator is 10 kHz The frequency offset is reduced from -121 dBc / Hz to -135 dBc / Hz and then dropped to -146 dBc / Hz after the second injection. Currently, there is no report of such high target in China and it is close to the report of the U.S. Navy’s laboratory. Practical stage, based on the principle of phase-locked design of a new stability control circuit and related experiments, verify the effectiveness of the circuit.