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Narrow linewidth 1560 nm InGaAsP split-contact corrugated ridge waveguide DFB lasers
Optics Letters
|November 1, 2014
Summary
Researchers developed a new InGaAsP distributed feedback laser operating at 1560 nm. This laser exhibits stable single-mode performance with excellent side-mode suppression and narrow linewidths.
Area of Science:
- Optoelectronics
- Semiconductor Lasers
- Photonics
Background:
- Distributed feedback (DFB) lasers are crucial for optical communication systems.
- Achieving stable single-mode operation with high performance is a key challenge in DFB laser development.
Purpose of the Study:
- To demonstrate a novel split-contact corrugated ridge waveguide InGaAsP DFB laser.
- To investigate the impact of p-contact partitioning on laser performance.
Main Methods:
- Fabrication of the laser using I-line stepper lithography and inductively coupled reactive ion-etching.
- Design of the laser cavity with uniform third-order gratings etched on ridge waveguide sidewalls.
- Characterization of laser performance under various biasing conditions.
Main Results:
- Stable single-mode operation achieved at 1560 nm.
- Side-mode suppression ratios (SMSR) ≥50 dB.
- Output powers ≥7 mW.
- Wavelength tuning range ≥2.3 nm.
- Narrow linewidths ≤140 kHz (minimum 70 kHz).
Conclusions:
- The demonstrated split-contact corrugated ridge waveguide DFB laser offers high performance.
- The device shows potential for applications in optical communication.
- Further studies on p-contact partitioning can optimize device performance.
