## Theoretical investigation of threshold properties of purely and partly gain-coupled distributed-feedback semiconductor lasers with stepwise constant coupling coefficients

JOSA B, Vol. 15, Issue 11, pp. 2689-2699 (1998)

http://dx.doi.org/10.1364/JOSAB.15.002689

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### Abstract

A basic analysis of complex-coupled distributed-feedback semiconductor lasers with stepwise constant coupling coefficients κ is derived. Solving coupled-wave equations at threshold reveals that the longitudinal distribution of κ as well as the relative amount of index and gain coupling plays a decisive role in the modal and spatial (internal fields) properties of complex-coupled structures. The standing-wave effect, extended to multisection devices, and the concept of apparent absorption induced by spatially dependent κ can explain the discrepancies between uniformly and nonuniformly complex-coupled structures. The complex-coupling profile is also discussed with respect to its influence on spatial hole burning and threshold gain margin, the usual criteria for optimizing sources in optical fiber telecommunication systems.

© 1998 Optical Society of America

**OCIS Codes**

(130.0250) Integrated optics : Optoelectronics

(140.3490) Lasers and laser optics : Lasers, distributed-feedback

(140.5960) Lasers and laser optics : Semiconductor lasers

(230.1480) Optical devices : Bragg reflectors

**Citation**

Thierry Fessant, "Theoretical investigation of threshold properties of purely and partly gain-coupled distributed-feedback semiconductor lasers with stepwise constant coupling coefficients," J. Opt. Soc. Am. B **15**, 2689-2699 (1998)

http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-11-2689

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