Dynamic range improvement of a microwave photonic link based on bi-directional use of a polarization modulator in a Sagnac loop.
Dynamic range improvement of a microwave photonic link based on bi-directional use of a polarization modulator in a Sagnac loop.
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DOI：
10.1364/oe.21.015692
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发表时间：
2013-07
期刊：
影响因子：
3.8
通讯作者：
Wangzhe Li;J. Yao
中科院分区：
文献类型：
--
作者：
Wangzhe Li;J. Yao
提出并实现了一种新型的微波光子链路，该链路基于Sagnac环中偏振调制器的双向使用，具有更高的无杂散动态范围（SFDR）。环路中的PolM与偏振控制器和偏振光束组合器一起用作马赫曾德尔调制器（MZM），其仅沿着顺时针方向调制入射光波，由于速度失配而使逆时针光波未被调制。产生沿沿着两条路径（路径1和路径2）的两个顺时针强度调制信号，其中一个（路径2）与来自逆时针方向的未调制光波组合以抑制部分光载波。通过控制两个路径之间的功率关系，可以完全抑制三阶互调失真（IMD 3），从而实现具有改善的动态范围的MPL。理论分析，这是通过实验验证。IMD3可被抑制50 dB，SFDR提高16 dB。
A novel microwave photonic link (MPL) with an improved spurious-free dynamic range (SFDR) based on a bidirectional use of a polarization modulator (PolM) in a Sagnac loop is proposed and demonstrated. The PolM in the loop functions, in conjunction with a polarization controller and a polarization beam combiner, as a Mach Zehnder modulator (MZM), which only modulates the incident light wave along the clockwise direction, leaving the counter-clockwise light wave unmodulated due to the velocity mismatch. Two clockwise intensity-modulated signals along two paths (Path 1 and Path 2) are generated, with one (Path 2) combined with the non-modulated light wave from the counter-clockwise direction to suppress part of the optical carrier. By controlling the power relationship between the two paths, the third-order intermodulation distortion (IMD3) can be fully suppressed, and thus an MPL with improved dynamic range is achieved. A theoretical analysis is presented, which is validated by an experiment. The IMD3 can be suppressed by 50 dB, giving an improvement in SFDR of 16 dB.