Mr. Md Shariful Islam Profile

Md Shariful Islam

at Georgia Tech Lorraine

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Proceedings Article | 20 May 2022 Presentation + Paper

Optical square waves in a multiquantum-well laser with nonlinear optoelectronic feedback

Md Shariful Islam, A. V. Kovalev, E. A. Viktorov, D. S. Citrin, A. Locquet

Proceedings Volume 12141, 1214103 (2022) https://doi.org/10.1117/12.2624503

KEYWORDS: Optoelectronics, Semiconductor lasers, Optical amplifiers, Feedback signals, Feedback loops, Nonlinear optics, Electronic filtering, Amplifiers

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Optical square waves (SWs) have been extensively investigated in semiconductor laser diodes (LDs) like VCSELs or EELs under optical feedback and/or optical injection. In this abstract, we discuss optical SW generation in a delay-driven optoelectronic (OE) feedback system. We have found that at high J, the SWs originate from the same branches of the dynamical regime as the gain-switched pulsing found close to the injection threshold (J_th) of a positive optoelectronic feedback system. A single-mode DFB multi-quantum-well (MQW) InGaAsP LD (3SP Technologies-1953LCV1) with J_th of 20 mA is used for this experiment. The origin of the feedback signal is the photodetector output, which is appropriately boosted in the amplifiers/attenuator cascade before feeding it to the radio frequency input arm of the Bias Tee. An oscilloscope measures the optical intensity after the PD. The delay in the feedback loop is τ=10.64 ns. The first appearance of the SW for this particular configuration is recorded at 48.20 mA. The SW appears with a repetition rate of f_τ=τ^(-1)=(10.64 ns)^(-1)=94 MHz. The optical spectrum shows two peaks separated by a frequency related to the duty cycle of the SWs. At higher feedback delay, the SWs appear at harmonics of the fundamental delay frequency. Theoretical analysis based on a delay-differential model and accounting for the multilevel amplification, multistage filtering, and saturable nonlinearity attributes the origin of the SWs to the same branches of dynamical regimes as those observed for the gain-switched pulse-train generation near the J_th and confirms the experimental observation of SW harmonics for higher feedback delays. In conclusion, we experimentally demonstrate SWG in a laser diode subjected to OE delayed feedback on its injection current.

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