Optical: systems and elements – Optical amplifier – Particular active medium
Reexamination Certificate
2007-01-02
2007-01-02
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Particular active medium
Reexamination Certificate
active
10767651
ABSTRACT:
A semiconductor optical amplifier (SOA) has an overall gain that is substantially polarization independent, i.e., less than 1 dB difference between transverse electric (TE) and transverse magnetic (TM) gain. The SOA includes a residual cladding layer having different thicknesses over different portions of the gain section. Over a first portion of the gain section, the residual cladding layer is thinner than over a second portion of the gain section. This results in the first portion providing more gain to optical energy having a TE polarization state than optical energy having a TM polarization state. In the second portion of the gain section, however, more gain is provided to optical energy having a TM polarization state than energy having a TE polarization state. The resulting gain differences can be designed to offset one another so that the output has a gain that is substantially polarization independent.
REFERENCES:
patent: 4923291 (1990-05-01), Edagawa et al.
patent: 5982531 (1999-11-01), Emery et al.
patent: 6310720 (2001-10-01), Walker et al.
patent: 6310995 (2001-10-01), Saini et al.
patent: 2001/0043390 (2001-11-01), Kim et al.
patent: 2002/0067541 (2002-06-01), Morito
patent: 2002/0154391 (2002-10-01), Goldstein et al.
patent: 2003/0067678 (2003-04-01), Shibata et al.
Shimada, S., et al., “Optical Amplifiers and their Applications,” Semiconductor Laser Amplifiers, John Wiley & Sons, Chapter 4, 1994, pp. 70-72.
Koga, M., et al., “Polarization Insensitive Optical Amplifier Consisting of Two Semiconductor Laser Amplifiers and a Polarization Insensitive Isolator in Series,” IEEE Photonics Technology Letters, vol. 1, No. 12, Dec. 1989, pp. 431-433.
Gustavsson, M., “Analysis of Polarization Independent Optical Amplifiers and Filters Based on Polarization Rotation in Periodically Asymmetric Waveguides,” IEEE Journal of Quantum Electronics, vol. 29, No. 4, Apr. 1993, pp. 1168-1178.
Dagenais Mario
Heim Peter J. S.
Merritt Scott A.
Saini Simarjeet S.
Bolda Eric
Keith Jack
Potomac Patent Group PLLC
Quantum Photonics, Inc.
LandOfFree
Low polarization gain dependent semiconductor optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low polarization gain dependent semiconductor optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low polarization gain dependent semiconductor optical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3805662