Generation of Phase-Stabilized Microwave Frequency Combs Based on an Actively Mode-Locked Optoelectronic Oscillator

Le résumé fourni par la source

A novel method of generating a microwave frequency comb (MFC) with stabilized carrier-envelope phases is proposed and experimentally demonstrated. The MFC is generated with an actively mode-locked optoelectronic oscillator (AML-OEO) incorporating an octave filter to realize second harmonic injection locking (SHIL), to achieve phase-stabilized comb generation. Second harmonics, arising from the nonlinearity of the modulator and the electrical amplifier can be employed as injection signals for the AML-OEO to eliminate the carrier-envelope offset (CEO). In the experiment, an octave-spanning comb with a repetition rate of 44.511 MHz is generated, showing a stabilized carrier-envelope phase and an ultralow frequency drift of less than 62 Hz in one hour, which is improved by two orders of magnitude as compared with existing works without using active loop feedback control. The collaboration of actively mode-locking and SHIL enables the generation of a microwave pulse train with a stabilized carrier-envelope phase and an ultralow frequency drift, making it a promising technique for future instrumentation and metrology systems.

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