Theoretical Performance Evaluation of Optical Complex Signals Based on Optically Injection-Locked Semiconductor Lasers

• Published in: IEEE journal of selected topics in quantum electronics Vol. 25; no. 6; pp. 1 - 9
• Main Authors: Cho, Jun-Hyung, Cho, Chun-Hyung, Sung, Hyuk-Kee
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive optics; Constellations; Injection locked semiconductor lasers; injection-locked oscillators; Locking; Oils; Optical attenuators; Optical communication; optical injection; Optical modulation; Optical signal processing; Parameters; Performance evaluation; phase modulation; Phase shift keying; Photonics; Semiconductor lasers; Trajectory analysis
• ISSN: 1077-260X; 1558-4542
• DOI: 10.1109/JSTQE.2019.2924155

We developed a method to generate optical complex signals based on optically injection-locked (OIL) semiconductor lasers and numerically evaluated their performance depending on the injection-locking parameters, injection ratio, and detuning frequency. We first determined the stable/unstable locking regions of the OIL system as a function of the injection-locking parameters through steady-state analysis. We then mapped the optical complex signal in both the stable injection-locking region and the complex signal plane. Based on the mapped relationship between the positions in the conventional injection-locking map and the complex signal plane, we theoretically evaluated the optical trajectories and constellation diagrams for the optical phase-shift keying signals and calculated the error-vector-magnitude with a data rate of 10 Gbaud/s using a time-domain calculation. We found that the complex signal performance could be improved using a higher injection ratio under a large negative detuning frequency.