Burst-Tolerant Tuning of Reflection-Type Transversal Filter Laser With Single Active Region

We developed a tunable laser based on a reflection-type transversal filter (RTF). The RTF laser is tuned by the electro-optic effect and exhibits low-power, high-speed, and narrow-linewidth switching operation in 35-nm bandwidth. While our previously developed RTF laser has multiple active regions (...

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Bibliographic Details
Published in:IEEE photonics technology letters 2022-01, Vol.34 (1), p.23-26
Main Authors: Saito, Yusuke, Ueda, Yuta, Shindo, Takahiko, Kanazawa, Shigeru, Matsuzaki, Hideaki, Ishikawa, Mitsuteru
Format: Article
Language:English
Subjects:
Active regions (lasers)
Laser tuning
Measurement by laser beam
Optical filters
Optical switches
Quantum cascade lasers
quantum confined Stark effect
reflection-type transversal filter
Semiconductor lasers
Switching
Transversal filters
Tunable laser diode
Waveguide lasers
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Summary:We developed a tunable laser based on a reflection-type transversal filter (RTF). The RTF laser is tuned by the electro-optic effect and exhibits low-power, high-speed, and narrow-linewidth switching operation in 35-nm bandwidth. While our previously developed RTF laser has multiple active regions (ACTs) that share the laser bandwidth, the newly designed one has a single ACT. Since the slow wavelength switching among ACTs is eliminated, we achieved high-speed eight-channel switching that covers >30-nm bandwidth for switching intervals differing by a factor of 1,000 (12.5 \mu \text{s} and 12.5 ms), which indicates the laser is burst tolerant. Furthermore, practical wavelength switching for 128-Gbps coherent signals was successfully demonstrated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2021.3133010