Dynamic regimes of time—delay signature of a semiconductor laser subjected to incoherent optical feedback

• Published in: Physics letters. A Vol. 522; p. 129784
• Main Authors: Nivedha, R., Sivaprakasam, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2024
• Subjects: Incoherent optical feedback; Lasing efficiency; Semiconductor diode laser; Time delay echo; Time delay signature; Turn-on delay; Time delay echo; Time delay signature; Turn-on delay; Incoherent optical feedback; Semiconductor diode laser; Lasing efficiency
• ISSN: 0375-9601
• DOI: 10.1016/j.physleta.2024.129784

•Incoherent Optical feedback (IOF) provides masking of Time-Delay-Signature.•Specific dynamical regime identified for secure optical communication.•Can be directly used in designing a secure optical communication system with IOF. The effect of incoherent optical feedback to a semiconductor diode laser is numerically investigated using Lang-Kobayashi rate equations. The model constitutes for diode laser systems in which the feedback loop length is longer than the coherence length of the laser. The time delay signature (TDS) of the external cavity is found to exhibit dynamical regimes corresponding to the incoherent feedback. The occurrence of time delay signature and its characteristics such as temporal spread exhibit a definite relation to the regimes of incoherent optical feedback. Lasing efficiency, threshold current and turn-on-delay characteristics also exhibit concurring regimentation of incoherent optical feedback to a semiconductor diode laser.