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학술지 Fabrication of wavelength-tunable butt-coupled sampled grating DBR lasers using planar buried heterostructure
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저자
오수환, 이지면, 김기수, 이철욱, 고현성, 박상기, 박문호
발행일
200312
출처
IEEE Photonics Technology Letters, v.15 no.12, pp.1680-1682
ISSN
1041-1135
출판사
IEEE
DOI
https://dx.doi.org/10.1109/LPT.2003.819722
협약과제
01MB3900, 광출력 안정화 Tunable LD 모듈, 박문호
초록
Planar buried heterostructure (PBH) was adopted to fabricate a sampled grating distributed Bragg reflector laser diode (SGDBR-LD) having a low threshold current and a stable fundamental transverse mode. The etching process for butt-coupling was optimized to improve the reproducibility and the uniformity of the butt-coupled waveguide. The maximum output power of the fabricated SGDBR-LD was 20 mW at 200-mA continuous-wave operation at 25 °C. The output power was measured 10 and 9 mW higher than those of ridged waveguide (RWG) structure and buried ridge stripe (BRS), and the threshold current was slightly higher than those of RWG and BRS. The spectra of 25 channels spaced 50 GHz within the tuning range of 44.4 nm was obtained by a precise control of SG and phase control currents. The side-mode suppression ratio of more than 35 dB was obtained in the whole tuning range. The output power variation was less than 5 dB, which is 4 dB smaller than that of RWG structure.
키워드
Butt-coupled, Integrated laser, Planar buried heterostructure laser diode (PBH-LD), Sampled grating (SG), Sampled grating distributed Bragg reflector laser diode (SGDBR-LD), Tunable laser
KSP 제안 키워드
Coupled waveguide, Distributed Bragg reflector laser, Etching process, Integrated laser, Laser diode(LD), Low threshold current, Phase control, Power variation, Precise control, Ridged waveguide, Sampled grating distributed Bragg reflector(SG-DBR)