Accession Number : ADP008199

Title :   Threshold Gain of a Grating-Assisted Co-directionally Coupled Twin-Guide Laser Diode,

Corporate Author : GHENT RIJKSUNIVERSITEIT (BELGIUM) LAB OF ELECTROMAGNETISM AND ACOUSTICS

Personal Author(s) : Willems, J. ; Morthier, G. ; Baets, R.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : Tunable lasers that cover a large wavelength range are important devices in wavelength division multiplexing applications. One promising structure is based on grating-assisted co-directional coupling between two waveguides and has recently been fabricated. This paper reports on the calculation of the threshold characteristics. An analytical expression has been derived, from which the threshold gain can be calculated. It turns out that lasing occurs at the wavelength of maximum coupling, only for not too large KL-values. This paper explains this behaviour. Furthermore the influence of the facet reflectivities is studied with respect to the threshold gain and the emission wavelength.

Descriptors :   *TUNABLE LASERS, *SEMICONDUCTOR LASERS, COUPLINGS, EMISSION, GAIN, MULTIPLEXING, STRUCTURES, BELGIUM, WAVEGUIDE COUPLERS, OPTICAL WAVEGUIDES.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE