Single-mode 140 nm swept light source realized by using SSG-DBR lasers

N. Fujiwara; R. Yoshimura; K. Kato; H. Ishii; F. Kano; Y. Kawaguchi; Y. Kondo; K. Ohbayashi; H. Oohashi

doi:10.1117/12.765392

5 March 2008 Single-mode 140 nm swept light source realized by using SSG-DBR lasers

N. Fujiwara, R. Yoshimura, K. Kato, H. Ishii, F. Kano, Y. Kawaguchi, Y. Kondo, K. Ohbayashi, H. Oohashi

Proceedings Volume 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII; 684713 (2008) https://doi.org/10.1117/12.765392
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

We demonstrate a single-mode and fast wavelength swept light source by using Superestrucuture grating distributed Bragg reflector (SSG-DBR) lasers for use in optical frequency-domain reflectometry optical coherence tomography. The SSG-DBR lasers provide single-mode operation resulting in high coherency. Response of the wavelength tuning is very fast; several nanoseconds, but there was an unintentional wavelength drift resulting from a thermal drift due to injecting tuning current. The dri¹ft unfortunately requires long time to converge; more than a few milliseconds. For suppressing the wavelength drift, we introduced Thermal Drift Compensation mesa (TDC) parallel to the laser mesa with the spacing of 20 μm. By controlling TDC current to satisfy the total electric power injected into both the laser mesa and the TDC mesa, the thermal drift can be suppressed. In the present work, we fabricated 4 wavelength's kinds of SSG-DBR laser, which covers respective wavelength band; S-band (1496-1529 nm), C-band (1529-1564 nm), L^--band (1564-1601 nm), and L⁺-band (1601-1639). We set the frequency channel of each laser with the spacing 6.25 GHz and 700 channels. The total frequency channel number is 2800 channels (700 ch × 4 lasers). We simultaneously operated the 4 lasers with a time interval of 500 ns/channel. A wavelength tuning range of more than 140 nm was achieved within 350 μs. The output power was controlled to be 10 mW for all channels. A single-mode, accurate, wide, and fast wavelength sweep was demonstrated with the SSG-DBR lasers having TDC mesa structure for the first time.

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N. Fujiwara, R. Yoshimura, K. Kato, H. Ishii, F. Kano, Y. Kawaguchi, Y. Kondo, K. Ohbayashi, and H. Oohashi "Single-mode 140 nm swept light source realized by using SSG-DBR lasers", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 684713 (5 March 2008); https://doi.org/10.1117/12.765392

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KEYWORDS

Wavelength tuning

Optical coherence tomography

Terahertz radiation

Light sources

S band

Tunable filters

Absorption

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