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Widely Tunable Grating Cavity Lasers
권오기,김강호,김종호,오광룡,심은덕,윤호경,O Kyun Kwon 한국전자통신연구원 2006 ETRI Journal Vol.28 No.5
A widely tunable multi-channel grating cavity laser is proposed and experimentally demonstrated. The device is implemented in Littman configuration with an echelle grating based on Rowland circle construction and realized by monolithically integrating all elements in an InP substrate. Lasing wavelength is selected by turning on an amplifier and the appropriate channel element in the array, and it is tuned by controlling light deflection electrically. The 6-channel device exhibits a tuning range of about 50 nm with a side mode suppression ratio of more than 30 dB. This is accomplished by adjusting the applied current of the dispersive element and phase control section.
권오기,백용순,정윤철,박형무 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3
A novel integrated laser, that is, a distributed reflector laser diode integrated with an electroabsorption modulator, is proposed to improve the output efficiency, single-mode stability, and chirp. The proposed laser can be realized using the selective metalorganic vapor phase epitaxy technique (that is, control of the width of the insulating mask), and its fabrication process is almost the same as the conventional electroabsorption modulated laser (EML) process except for the asymmetric coupling coefficient structure along the cavity. For our analysis, an accurate time-domain transfer-matrix-based laser model is developed. Based on this model, we perform steady-state and large-signal analyses. The performances of the proposed laser, such as the output power, extinction ratio, and chirp, are compared with those of the EML. Under 10-Gbps NRZ modulation, we can obtain a 30% higher output power and about 50% lower chirp than the conventional EML. In particular, the simulation results show that the chirp provided by the proposed laser can appear to have a longer wavelength side at the leading edge of the pulse and a shorter wavelength side at the falling edge.
권오기,김강호,김현수,김종회,심은덕,오광룡 한국광학회 2003 한국광학회지 Vol.14 No.3
광대역 이득 특성을 얻기 위한 InGaAsP-InP 응력보상 비대칭 다중 양자우물(Asymmetric Multiple Quantum Well, AMQW) 구조를 성장하고, Ridge Waveguide Laser Diodes(RWG-LDs)를 제작하였다. 제작 후 소자의 동작변수와 모드 이득을 측정하였으며, 얻어진 결과를 비교, 분석하였다. 외부 공진기형 구조에서 넓고 평탄한 이득특성을 얻기 위해 한쪽 단면에 Anti-Reflection(AR) 코팅을 수행하여 AR coated AMQW RWG LD의 이득특성을 분석하였다. Asymmetric multiple quantum well ridge waveguide laser diodes (AMQW RWG LDs) with a wide and flat gain spectrum were designed and fabricated. The operating parameters and gain spectra were measured and analyzed for uncoated and anti-reflection (AR) coated LDs. For AR coated 500 mm-long RWG LOs, the extremely flat gain spectrum over a spectral range of 90 nm was obtained at the current 75 ㎃.