Tunable frequency-doubled optoelectronic oscillator based on a phase modulator in a Sagnac loop
Tunable frequency-doubled optoelectronic oscillator based on a phase modulator in a Sagnac loop
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DOI：
10.1016/j.ijleo.2017.08.009
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发表时间：
2017-09
期刊：
影响因子：
3.1
通讯作者：
Shuo Shang;A. Wen;Yongsheng Gao;Wu Zhang
中科院分区：
文献类型：
--
作者：
Shuo Shang;A. Wen;Yongsheng Gao;Wu Zhang
提出了一种基于Sagnac环中相位调制器的可调谐倍频光电子振荡器（FD-OEO）方案，并进行了实验验证。光波被分成两半，并沿顺时针（CK）和逆时针（CCK）方向沿着发送到萨尼亚克环。沿着CK方向的光波在PM中被有效调制，而沿着CCK方向的光波由于速度失配而没有被调制。来自Sagnac环的光输出被分成两部分。一部分反馈到PM的射频（RF）端口以形成OEO环路并获得基波信号。另一部分用于通过抑制光载波来获得倍频信号。利用可调谐电滤波器可使OEO的基频在3 ~ 20 GHz范围内连续可调，从而可获得6 ~ 40 GHz的倍频信号。研究了产生的基波和倍频信号的相位噪声特性。
A tunable frequency-doubled optoelectronic oscillator (FD-OEO) scheme based on a phase modulator (PM) located in a Sagnac loop is proposed and experimentally demonstrated. A light wave is halved and sent to the Sagnac loop along the clockwise (CK) and counter-clockwise (CCK) directions. The light wave along the CK direction is effectively modulated in the PM, while the one along the CCK direction is not modulated due to velocity mismatch. The optical output from the Sagnac loop is separated into two parts. One part is fed back to the radio-frequency (RF) port of the PM to form an OEO loop and obtain a fundamental signal. The other part is used to obtain a frequency-doubled signal by suppressing the optical carrier. The fundamental frequency of the OEO is continuously adjustable within the range from 3 to 20 GHz using a tunable electric filter, so a frequency-doubled signal with a frequency ranging from 6 to 40 GHz can be obtained. The phase noise performance of the generated fundamental and frequency-doubled signal is also studied.