Coherent light generators – Particular resonant cavity – Distributed feedback
Reexamination Certificate
2005-11-15
2005-11-15
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular resonant cavity
Distributed feedback
C372S045013, C372S046012
Reexamination Certificate
active
06965628
ABSTRACT:
A distributed feedback (“DFB”) laser featuring improved manufacturing yield and operational characteristics is disclosed. The present DFB laser includes a bottom confinement layer, an active region, and a top confinement layer disposed atop an n-doped substrate. A p-doped first top layer having a first index of refraction is disposed atop the top confinement layer. A grating is defined in the top surface of the first top layer, and a p-doped second top layer is overlaid on the grating. The two laser end facets are antireflectively coated. The grating is anisotropically etched to define a low kappa grating half and a high kappa grating half. Light waves produced in the active region interact with the grating and are biased toward the low kappa grating half that results in the majority of light signals passing through the end facet adjacent the low kappa grating half.
REFERENCES:
patent: 5040188 (1991-08-01), Lang et al.
patent: 5208824 (1993-05-01), Tsang
patent: 5241556 (1993-08-01), Macomber et al.
patent: 5506859 (1996-04-01), Ackerman et al.
patent: 6018541 (2000-01-01), Huang
patent: 6111906 (2000-08-01), Muroya
patent: 6175581 (2001-01-01), Sato
patent: 6577660 (2003-06-01), Muroya
patent: 6594298 (2003-07-01), Ryu et al.
patent: 6771681 (2004-08-01), Bang et al.
Carroll, J. et al., IEE Circuits, Devices and Systems Series 10,Distributed Feedback Semiconductor Lasers,SPIE Press M onograph vol. PM 52, Capter 1 & 2, 1998.
Agrawal, Govind P. et al, Semiconductor Lasers 2nd Ed., Chapter 7,Distributed-Feedback Semiconductor Lasers,pp. 319-337, 1993.
Nilsson, S. et al., IEEE Photonics Technology Letters,DFB Laser With Nonuniform Coupling Coefficient Realized by Double-Layer Buried Grating,vol. 5, No. 10, Oct. 1993.
Boucer, Y, et al., IEEE Journal of Quantum Electronics,Quasi-Periodic Complex-Coupled Distributed-Feedback Structures With An Exponential-Like Gradient of Coupling,vol. 33, No. 12, Dec. 1997.
Hansmann, S. et al., IEE Journal of Selected Topics in Quantum Electronics,Variation of Coupling Coefficients by Sampled Gratings in Complex Coupled Distributed-Feedback Lasers,vol. 1, No. 2, Jun. 1995.
Deng Qing
Giaretta Giorgio
Lenosky Thomas
Finisar Corporation
Harvey Minsun Oh
Jackson Cornelius H.
Workman Nydegger
LandOfFree
Distributed feedback laser having a differential grating does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Distributed feedback laser having a differential grating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Distributed feedback laser having a differential grating will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3520157