Current Modulation Induced Stability in Laser Diode Under High Optical Feedback Strength
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/2991927Utgivelsesdato
2021Metadata
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Originalversjon
Jha, A. Shah, M. K. Jha, S. Cenkeramaddi, L. R. Royo, S. (2021). Current Modulation Induced Stability in Laser Diode Under High Optical Feedback Strength. IEEE Access, 9, 49537-49546. 10.1109/ACCESS.2021.3069387Sammendrag
The back-reflection of emitted laser beam (optical feedback, also know as selfmixing) from
various external interfaces are sufficient to cause instability, and prohibiting its use in various fields such as
communication, spectroscopy, imaging to name a few. So it is desirable to study the laser dynamics and
the conditions causing it to be stable in spite of strong optical feedback. With the aid of mathematical
formulation, simulation and backed by experimental evidences, it is demonstrated that the frequency
deviation of the laser emission due to current (intensity) modulation alters the dynamic state and boundary
conditions of the system such that even under large optical feedback strength, the laser may attain stability
and retain single modal state. The frequency deviation resulting from former is shown to modify the phase of
the system in opposite direction to that induced by the later, showing that there exists an optimal modulation
current which compensates the effect of optical feedback and may be used to retain the laser in single modal
stationary state. The method thus provides a methodology to avoid optical feedback-induced instability in
semiconductor lasers by using the proper amplitude of current (intensity) modulation.