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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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High slope efficiency single-mode surface-emitting DFB lasers with optimized λ/4 phase shift position.

Nanguo Li, Yuting Ma, Can Liu

|July 30, 2025

Summary

This summary is machine-generated.

This study presents a novel single-mode surface-emitting laser for data centers. Optimized grating design achieves high slope efficiency and 22 GHz bandwidth, paving the way for faster optical communication.

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Area of Science:

Optoelectronics
Semiconductor Lasers
Photonics

Background:

Single-mode surface-emitting lasers are vital for high-bandwidth data centers.
Grating-coupled lasers often face limitations in slope efficiency and threshold.

Purpose of the Study:

To develop a high slope efficiency single-mode surface-emitting laser.
To optimize grating design for improved laser performance.

Main Methods:

Designed a distributed feedback laser with an optimized \u03bb/4 phase shift position in the second-order grating.
Utilized an unpumped distributed Bragg reflector and spin-on-glass (SOG) for grating fabrication.
Incorporated a rectangular oxidation aperture and benzocyclobutene for modulation.

Main Results:

Achieved a slope efficiency of 0.3 mW/mA with potential for 0.6 mW/mA.
Obtained a high grating coupling coefficient of 560 cm^-1.
Demonstrated a side-mode suppression ratio (SMSR) of 50 dB and thermal resistance of 0.62 K/mW.
Reached a 3-dB modulation bandwidth of 22 GHz at 8 mA bias current.

Conclusions:

Optimized \u03bb/4 phase shift position enhances vertical diffraction and laser efficiency.
The developed laser exhibits stable single-mode operation and good thermal performance.
Predicted 3-dB modulation bandwidth of 34 GHz with further optimization.