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학술지 Simple Detuning Method for Low-Chirp Operation in Polymer-Based Tunable External-Cavity Lasers
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저자
최병석, 정종술, 이학규, 정윤철
발행일
201511
출처
Optics Express, v.23 no.24, pp.30657-30666
ISSN
1094-4087
출판사
Optical Society of America(OSA)
DOI
https://dx.doi.org/10.1364/OE.23.030657
협약과제
15MB1200, 소프트웨어 정의 네트워크(SDN) 기반 Flexible 광노드 핵심기술 개발, 권용환
초록
We propose and demonstrate a simple detuning method for the low-chirp operation of a polymer-based tunable external-cavity laser (ECL). To ensure the low-chirp operation of this directly-modulated ECL, we first obtain the optimum values of the heater current applied to the polymer Bragg grating reflector (PBR) and the operating temperature of this ECL. For this purpose, we sweep the current applied to the phase control heater until the peak output power measured from the high-reflection (HR) coated facet reaches the minimum value. We then operate this ECL with minimum chirp by tuning the lasing mode to the longer wavelength limit of the stable operation region. This is because the detuned loading effect is maximized at this limit as the in-phase condition between the lights reflected from the PBR and anti-reflection (AR) coated facet of the gain medium is satisfied. Thus, by using this method together with conventional wavelength-locking algorithm, we can operate this ECL with minimum chirp at any wavelength.
KSP 제안 키워드
Anti-Reflection, Bragg grating(FBG), External cavity laser, Gain medium, In-phase, Loading effect, Operation Region, Output power, Phase control, Stable operation, operating temperature