Coupled phase-shift distributed-feedback semiconductor lasers for narrow linewidth operation

Journal Article · Fri Mar 31 23:00:00 EST 1989 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.17330· OSTI ID:6161877

Kimura, T; Sugimura, A

Mode properties of a coupled phase-shift distributed feedback (DFB) structure are analyzed and its feasibility of narrow-linewidth emission is shown theoretically. The structure consists of a multiple number of phase-shift DFB laser units which are arranged in tandem and coupled with each other through additional phase shift of corrugation. Optimum structure parameters were determined for two coupled laser units so that the frequency detuning is zero and the mode pattern is the flattest. The mode analysis shows that the intensity distribution is flatter and the normalized coupling constant can be larger than those for the conventional DFB laser with a single phase shift. This indicates that the cavity length can be extended with less influence from the longitudinal spatial hole burning effect. The linewidth, which is significant in coherent optical communications, was calculated by taking into account the spatial hole burning effect. It was found that the linewidth can be made as narrow as 0.2 MHz by coupling two DFB laser units. This linewidth is about five times narrower than the value expected theoretically in the conventional structure.

• Research Organization: NTT Basic Research Labs., 3-9-11 Midori-cho, Musashino-shi, Tokyo 180 (JP)
• OSTI ID: 6161877
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 25:4; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CALCULATION METHODS
COUPLING CONSTANTS
DATA
DESIGN
INFORMATION
LASERS
LINE WIDTHS
MODE SELECTION
NUMERICAL DATA
PERFORMANCE
PHASE SHIFT
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
THEORETICAL DATA