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Timing jitter reduction in semiconductor lasers induced by optical injection.

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|November 1, 2023

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Continuous-wave optical injection (OI) from a vertical-cavity surface-emitting laser (VCSEL) can reduce timing jitter in gain-switched discrete-mode semiconductor lasers (DMLs) by up to 70%. However, specific detunings can unexpectedly increase jitter.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Laser Dynamics

Background:

Gain-switched discrete-mode semiconductor lasers (DMLs) are crucial for high-speed optical communications.
Timing jitter in DMLs limits their performance and necessitates mitigation strategies.
Optical injection (OI) is a potential method for controlling laser dynamics.

Purpose of the Study:

To experimentally investigate the impact of continuous-wave optical injection (OI) on the timing jitter of a gain-switched DML.
To analyze the effect of varying temperature-tuned detuning between the DML and the injecting VCSEL on timing jitter.
To compare OI-induced timing jitter with the intrinsic inter-pulse timing jitter of the DML.

Main Methods:

Experimental setup involving a gain-switched DML and a continuous-wave VCSEL for optical injection.
Temperature control of the DML to systematically vary the frequency detuning between the lasers.
Measurement and analysis of timing jitter over a range of detunings and comparison with solitary DML jitter.

Main Results:

A significant reduction in timing jitter, up to 70%, was observed for the DML under OI within a specific range of detunings.
The effectiveness of jitter reduction was found to be highly sensitive to the precise detuning between the VCSEL and DML.
Certain detuning values within the optimal range paradoxically led to a substantial increase in timing jitter.

Conclusions:

Continuous-wave optical injection from a VCSEL offers a viable method for actively controlling and reducing timing jitter in gain-switched DMLs.
Precise control over the frequency detuning is critical for successful jitter suppression, as suboptimal detuning can exacerbate jitter.
This study highlights the complex interplay between optical injection parameters and laser jitter, offering insights for optimizing laser performance in high-speed systems.