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Tunable Laser via High-Density Integration of DFB Lasers With High Precision Wavelength Spacings.
- Source :
- IEEE Photonics Technology Letters; 5/1/2022, Vol. 34 Issue 9, p467-470, 4p
- Publication Year :
- 2022
-
Abstract
- Fast optical switches have the potential of lowering the cost, power, and latency of today’s data-center networks. The on-off switching of DFB lasers in arrays is poised to provide extremely fast switching because the on-off time of a DFB laser is the level of sub-nanosecond. However, the key of the DFB laser array based tunable laser lies in the high precision control of the lasing wavelength. In this letter, we proposed and experimentally demonstrated a tunable laser by integrating 16 DFB lasers based on the reconstruction-equivalent-chirp (REC) technique. Without using the conventional e-beam lithography, an equivalent $\lambda $ /4 phase-shift is fabricated in each DFB laser to ensure the single-longitudinal-mode (SLM) yield. Moreover, high precise wavelength spacing is realized. Wavelength deviations of 89.3% DFB lasers are within ±0.2 nm. The output power of all the channels is above 7 mW, and the relative intensity noise is below −130 dB/Hz. By on-off switching the lasers, sixteen channels with 2.4-nm spacing can be fast switched. The switching time between any two channels is less than 50 ns. In addition, a wide-band continuous wavelength tuning range of 38.4 nm can be obtained with a small temperature variation of 18 °C. Owing to the REC technique, the tunable laser via high-density integration of DFB lasers is demonstrated with simple fabrication, high SLM yield, and high wavelength precision, which opens up a path for wide-band and especially fast tunable lasers. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10411135
- Volume :
- 34
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- IEEE Photonics Technology Letters
- Publication Type :
- Academic Journal
- Accession number :
- 157582113
- Full Text :
- https://doi.org/10.1109/LPT.2022.3164456