Optical waveguides – Polarization without modulation
Reexamination Certificate
2005-06-07
2005-06-07
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Polarization without modulation
C385S016000, C385S147000
Reexamination Certificate
active
06904189
ABSTRACT:
Ultra fast, compact wavelength-selective 2×2 optical switches based on polarization splitters and preferably electro-optical polarization converters, and switch matrices based on such switches. The switches and switch matrices are preferably implemented on electro-optical substrates using planar light-wave circuit technology. Switch designs include switches comprised of two polarization splitters and two polarization converters, and a switch comprised of one polarization splitter and two polarization converters. In a preferred embodiment, a switch comprises a TE-barring polarization splitter, a TM-barring polarization splitter, and two electro-optical wavelength-selective polarization converters connected in parallel between the TE- and TM-barring polarization splitters, and is implemented on an electro-optical substrate such as InP, GaAs, LiNbO3or LiTaO3using planar lightwave circuit technology. A preferred embodiment of a switch matrix for connecting i optical inputs to i monitoring outputs and to j optical outputs comprises a plurality of i×j wavelength-selective 2×2 optical switches arranged in i rows and j columns, each optical switch including a TE-barring polarization splitter, a TM-barring polarization splitter, and two wavelength-selective polarization converters connected in parallel between the TE- and TM-barring polarization splitters. The switch matrix is also preferably implemented using planar lightwave circuit technology.
REFERENCES:
patent: 5900957 (1999-05-01), Van Der Tol
patent: 6370167 (2002-04-01), Donati et al.
patent: 6754403 (2004-06-01), Schmid
patent: 2003/0161566 (2003-08-01), Frommer et al.
patent: 2003/0235370 (2003-12-01), Taillaert et al.
patent: 2004/0008916 (2004-01-01), Ridgway et al.
patent: 2004/0208614 (2004-10-01), Price
H. Nakajima, “Development on guided-wave switch arrays.”IECE Trans. Commun.vol. E-82B, pp. 349-356, 1999.
“Wavelength-selective devices” by M.K. Smit, A.M.J. Koonen, H. Herrmann and W. Sohler in N. Grote, H. Venghaus (eds.),Devices in Optical Communication Systems,Springer Verlag, Berlin (2000).
Alferness “Efficient waveguide electro-optic TE-TM mode converter/wavelength filter” Appl physics Lett. vol. 36 pp 513-515, 1980.
Neyer, “Low cross-talk passive polarization splitters using Ti:LiNbO3waveguide crossings”,Appl. Phys. Lett.,vol. 55 pp. 927-929, 1989.
F. Tian, Ch. Harizi, H. Herrmann, V. Reimann, R. Ricken, U. Rust, W. Sohler, F. Wehrmann and S. Westenhofer, “Polarization independent integrated optical, acoustically tunable double stage wavelength filter in LiNbO3”,J. Lightwave Technol.,vol. 12 pp. 1192-1197, 1994.
Wehrmann, Ch. Harizi, H. Herrmann, U. Rust, W. Sohler and S. Westenhofer, “Integrated optical, wavelength-selective, acoustically tunable 2×2 switches (add-drop multiplexers) in LiNbO3”,IEEE J. Selected topics in Quantum Electronics,vol. 2 pp. 263-269, 1996.
N. Goto and G.L. Yip, “A TE-TM mode splitter in LiNbO3by proton exchange and Ti diffusion”,J. Lightwave Technol.,vol. 7 pp. 1567-1574, 1989.
J.E. Baran and D. A. Smith, “Adiabatic 2×2 Polarization splitter in LiNbO3”,IEEE Phot. Technol. Lett.,vol. 4 pp. 39-40, 1992.
T. Pohlmann et al “Polarization Independent Ti:LiNb03 Switches and Filters” IEEE J of Quantum Electronics, vol. 27 pp. 602-607, 1991.
Frommer Aviv
Kopelovitz Ben-Zion
Friedman Mark M.
Lynx Photonic Networks Inc.
Ullah Akm Enayet
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