An Optical Frequency Shifter Based on High-Order Optical Single-Sideband Modulation and Polarization Multiplexing

作者：Li, Xuan^*; Zhao, Shanghong; Zhu, Zihang; Qu, Kun; Lin, Tao; Pan, Shilong

来源：Journal of Lightwave Technology, 2016, 34(22): 5094-5100.

DOI：10.1109/JLT.2016.2611018

• Microwave photonics
• optical frequency shifter
• polarization multiplexing
• single-sideband modulation

We propose and experimentally demonstrate a novel electro-optic frequency shifter with frequency multiplication operation based on high-order optical single-sideband (SSB) modulation and polarization multiplexing using an integrated dual-polarization quadrature phase shift keying (DP-QPSK) modulator. By changing the dc bias phases of the modulator and the phase difference between the input RF signals, two-high-order SSB modulation signals are generated from the two QPSK modulators. After that, the two optical signals are polarization multiplexed and then projected to one direction to remove the low-order sidebands while only the high-order sideband is reserved. The scheme is numerically analyzed with themodulation indices of the modulator for optimal operation. A distinct advantage of this approach is the capability to generate a frequency shifting with a continuous and ultrawide tunable range (more than +/- 100 GHz), and the tuning operation is accurate, simple, and flexible. An experiment is carried out to achieve a frequency-doubled optical frequency shifter. A continuous frequency shifting ranged from -36 to 36 GHz is experimentally verified.

• 出版日期2016-11-15
• 单位南京航空航天大学; 中国人民解放军空军工程大学