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M. FADHALA1,* , S. KHORSHEED1,*
In this simulation study, unidirectional optical loop-mirror type is simulated by using an optical fiber. The laser source that feeds the loop mirror is a multimode distributed-feedback laser (DFB). Optisystem 18 software was used to configure the setup, which included four laser sources. Effect of amplifier gain on a circulated chaotic signal within the loop mirror in addition to filtering. Results indicated that amplificating with 20, 50, and 80 dB values the circulated optical feedback and injection inside the filtered loop mirror gives rise to chaotic dynamics in both single mode and multi-mode lasers. Broadening and annihilation of lasing frequencies are observed in the resulting power and RF spectra. The input optical power 0.878 after amplifier become 6.939 dB, while -17.369 to 43.610 dB at Gain of optical amplifier 80 dB. The optical spectrum becomes sharper than that observed in the free-running identical spectrum. It is expected that with operation, the two modes will be enhanced due to the filtering associated with the reflected portion, compared with the spectrum associated with the transmitted spectrum. There was a new, lower-amplitude mode that accompanied each mode. We shall use the term “coherence collapse” in this paper exclusively to describe the optical injection catastrophic line broadening in a DFB. The chaotic signal follows steps before becoming similar to the coherent collapse effect. This will be a new result in simulating coherence collapses. It employs an interferometer to enhance encryption via chaotic signals. Increasing security in this experiment is based on different mechanisms that improve security. In addation that, tested parameters such as phase, amplification, filtration, and current operation level were added to the chaotic dynamics introduced in this work.
Chaos, FBG Sensor, Distributed-Feedback Laser, Nonlinear Optical Loop Mirror, Gain, Multimode.
M. FADHALA, S. KHORSHEED, Simulating multimode DFB laser chaotic emission with a filtered unidirectional nonlinear loop mirror, Optoelectronics and Advanced Materials - Rapid Communications, 18, 5-6, May-June 2024, pp.200-216 (2024).
Submitted at: Oct. 13, 2023
Accepted at: June 5, 2024
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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