Frequency synthesis of forced opto-electronic oscillators at the X-band

查看全文 作　　者：T. [1]Sun;Li. [2]Zhang;A. K. [2]Poddar;U. L. [2]Rohde;A. S. [1]Daryoush 机构地区：[1]Department of ECE, Drexel University, Philadelphia, PA 19104 USA;[2]Synergy Microwave Corp., Paterson, NJ 07504 USA 出　　处：《Chinese Optics Letters》索引2017年第15卷第1期,共5页 摘　　要：Ultra-low phase noise performance is required for frequency agile local oscillators, which are the core for high resolution imagers, spectrum analyzers, and high speed data communications. A forced opto-electronic oscillator(OEO) benefits from frequency stabilization techniques for realizing a clean and low phase noise source at microwave and millimeter wave frequencies. Forced oscillation techniques of self-injection locking and self-phase lock loop are combined to provide an ultra-low oscillator phase noise both close-in and far-away from the carrier frequency, while a tunable yttrium iron garnet microwave filter combined with a wavelength tuned transversal filter are employed to implement both coarse and fine frequency tuning for a tunable X-band OEO. A phase noise of-137 dBc∕Hz at an offset frequency of 10 kHz is achieved covering the frequencies of 9 to 11 GHz with a fine frequency tuning resolution of 44 Hz/pm and coarse tuning of 25 MHz/m A. Moreover, the long term stability of the output signal is tested, and a maximum frequency drift of 2 kHz is measured within 60 min for the X-band synthesizer. 关 键 词：纤维光学连接和分系统 收音机频率 photonics 振荡器