Low-dispersion penalty directly modulated 1.55-um DFB lasers with complex coupled gratings

Leonard J. P. Ketelsen; L. Eng; Il Kim; J. A. Grenko; D. Sutryn; Thomas Wessel; U. K. Chakrabarti; Debbie L. Coblentz; Robert L. Hartman

doi:10.1117/12.236932

1 April 1996 Low-dispersion penalty directly modulated 1.55-um DFB lasers with complex coupled gratings

Leonard J. P. Ketelsen, L. Eng, Il Kim, J. A. Grenko, D. Sutryn, Thomas Wessel, U. K. Chakrabarti, Debbie L. Coblentz, Robert L. Hartman

Author Affiliations +

Proceedings Volume 2684, High-Speed Semiconductor Laser Sources; (1996) https://doi.org/10.1117/12.236932
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Prior to the full maturation of electro-absorption modulated laser technology, directly modulated 1.55 micrometer distributed feedback lasers will continue to play a central role in long haul, high bit rate, optical communications systems. Maintaining a competitive advantage, however, requires that these devices be optimized for long fiber length transmission, high power, and low cost. In this talk we discuss the design elements needed to accomplish this. Focus is placed on factors leading to reduction of the linewidth enhancement factor, (alpha) . In particular, the role played by complex gratings is examined. We demonstrate typical cw (alpha) values of 1.65 can be achieved in a robust and manufacturable device. This device is shown to readily serve 2.5 Gb/s applications with span lengths of 200 km (approximately 3600 ps/nm).

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Leonard J. P. Ketelsen, L. Eng, Il Kim, J. A. Grenko, D. Sutryn, Thomas Wessel, U. K. Chakrabarti, Debbie L. Coblentz, and Robert L. Hartman "Low-dispersion penalty directly modulated 1.55-um DFB lasers with complex coupled gratings", Proc. SPIE 2684, High-Speed Semiconductor Laser Sources, (1 April 1996); https://doi.org/10.1117/12.236932

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