Open AccessReconfigurable photonic dual‐frequency phase‐coded signals generator by using optical carrier phase shifting and polarisation selection
Author(s) -
Li Xuan,
Zhao Shanghong,
Zhu Zihang,
Qu Kun,
Lin Tao,
Hu Dapeng
Publication year - 2018
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2017.0035
Subject(s) - phase shift keying , optical carrier transmission rates , sideband , photonics , keying , physics , signal generator , signal (programming language) , radio frequency , electronic engineering , optics , computer science , telecommunications , bit error rate , radio over fiber , engineering , optical fiber , chip , programming language , channel (broadcasting)
A novel photonic dual‐frequency phase‐coded signals generator based on the optical carrier phase shifting and polarisation selection techniques is proposed by using an integrated dual‐polarisation quadrature phase shift keying (DP‐QPSK) modulator. The key feature of the scheme is the capability to generate dual‐frequency phase‐coded signals with reconfigurable frequency multiplication factors. In the upper QPSK modulator, an optical binary phase shift keying (BPSK) signal and a carrier‐suppressed double‐sideband optical signal are generated, while in the bottom QPSK modulator, another carrier‐suppressed double‐sideband optical signal is generated. Thanks to the dual‐polarisation property of the integrated modulator, the optical BPSK signal and different optical sidebands can be selected by using polarisation selection. As a result, two phase‐coded signals with different frequencies can be achieved simultaneously. By adjusting the bias phases of the submodulators, dual‐frequency phase‐coded signals with frequencies of one and three, or two and four times the frequency of the RF carrier can be generated. The generation of 2.5 Gbps dual‐frequency phase‐coded signals with frequencies of 20 and 40 GHz, or 10 and 30 GHz are verified. The proposed scheme is simple, compact, and promising to find applications in future multi‐band and multi‐functional radars.