편광 또는 무편광 패브리-페롯 레이저 다이오드의 활성층 및 주입 잠금 동작 특성 모델링
Modeling of Active Layer and Injection-locking Characteristics in Polarized and Unpolarized Fabry-Perot Laser Diodes
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초록
본 논문에서는 패브리 페롯 레이저 다이오드(FP-LD : Fabry-Perot LD)에서 활성층 구조에 따른 주입 잠금 특성을 비교하였다. 편광 및 무편광 다중양자우물 구조와 무편광 벌크 구조의 이득 스펙트럼 및 주입 캐리어 밀도에 따른 최대 이득 특성을 TE,TM 편광에 대하여 계산하였다. 계산된 이득 파라미터를 시영역 대신호 모델에 적용하여 FP-LD의 주입 잠금 특성을 확인한 결과, 무편광 FP-LD가 편광 FP-LD 에 비하여 RIN(Relative Intensity Noise) 특성 면에서 약 3 dB 정도 우수하고, 2.5 Gbps 변조시에 아이 특성이 훨씬 우수함을 알 수 있다.
Abstract
In this paper, injection-locking characteristics versus active layer structures in Fabry-Perot laser diodes (FP-LD) are compared. TE and TM gain spectra and peak gains versus carrier density in polarized and unpolarized multiple quantum well structures and in an unpolarized bulk structure are calculated. The calculated gain parameters are applied to a time-domain large-signal model to simulate the injection-locking characteristics. The results show that RIN in unpolarized FD-LDs is about 3 dB lower than that in a polarized FP-LD and that the eye characteristics of the unpolarized FP-LD are much better than those of the polarized FP-LD.
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