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Design and Fabrication of Butt-Coupled Sampled Grating DBR Lasers Using Planar Buried Heterostructures
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- 발행일
- 200701
- 출처
- Journal of the Korean Physical Society, v.50 no.1, pp.64-71
- ISSN
- 0374-4884
- 출판사
- 한국물리학회 (KPS)
- 협약과제
- 06MB1900, 광엑세스용 광집적 모듈, 오광룡
- 초록
- A butt-coupled (BT) sampled grating distributed Bragg reflector laser diode (SGDBR-LD) was designed and fabricated using a planar buried heterostructure (PBH), enabling a low threshold current and a stable fundamental transverse mode. The maximum output power of the fabricated SGDBR-LD was 24 mW for 200 mA CW operation at 25 C. The measured output power was 14 mW and 13 mW higher than those of a ridged waveguide (RWG) structure and a buried ridge stripe (BRS). Also, the threshold current was 2 times lower than those of the RWG and the BRS. Butt-coupled SGDBR-LD’s with target tuning ranges of 44.4 and 63.4 nm were fabricated, and the tuning ranges were experimentally measured to be 44.4 and 58 nm, respectively. The measured peak periods of the fabricated SGDBR-LD’s were well matched with theoretical values, and the output power was close to the calculated values in both cases. The spectrum of 78 channels spaced by 50 GHz within the tuning range of 35 nm was obtained by using the precise control of the SG and the phase control currents. A side-mode suppression ratio of more than 35 dB was obtained over the whole tuning range. The output power variation was less than 5 dB, which is 4 dB smaller than that of the RWG structure.lEv
- KSP 제안 키워드
- 5 nm, Design and fabrication, Distributed Bragg reflector laser, Laser diode(LD), Low threshold, Measured output, Phase control, Power variation, Precise control, Ridged waveguide, Sampled grating distributed Bragg reflector(SG-DBR)