Linewidth reduction of DSM lasers due to effects of composite cavity and distributed reflectors

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/3.234433· OSTI ID:5708467

Kudo, Koji; Arai, Shigehisa; Shim, Jong In ^[1]

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1. Tokyo Institute of Tech., Tokyo (Japan). Dept. of Physical Electronics

Spectral properties of dynamic single-mode (DSM) lasers are theoretically analyzed in terms of the effects of composite cavity and distributed reflectors. The authors find unique reduction mechanisms of adiabatic chirp and linewidth in distributed reflector (DR) lasers and complex-coupled (CC) (i.e., gain + index-coupled) DSM lasers. Introducing convenient functions of effective length and detuning coefficient, these reduction mechanisms are explained from the viewpoints of modal phase and modal gain behaviors. For CC-DSM lasers, it is shown that the arrangement of index and gain corrugation, namely, anti-phase or in-phase combination, will suppress or enhance an effective linewidth enhancement factor [alpha][sub eff], respectively. Numerical results show that DR structures are much superior in the spectral and single-mode properties to DFB and DBR structures, both in index-coupled (IC) and CC lasers. By introducing gain coupling into the IC-DFB laser, [alpha][sub eff] can be reduced to half the material [alpha], and it will be further reduced by adopting the CC-DR laser structure proposed here.

• OSTI ID: 5708467
• Journal Information: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States) Vol. 29:6; ISSN 0018-9197; ISSN IEJQA7
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
AMPLIFICATION
CAVITY RESONATORS
DATA
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
GAIN
INFORMATION
LASER CAVITIES
LASERS
LINE WIDTHS
NUMERICAL DATA
OPTICAL PROPERTIES
OPTICAL SYSTEMS
PHYSICAL PROPERTIES
REFLECTIVITY
RESONATORS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SOLID STATE LASERS
SPECTRA
SURFACE PROPERTIES
THEORETICAL DATA