Planar lightwave circuit type variable optical attenuator

Optical waveguides – Accessories – Attenuator

Reexamination Certificate

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Details

C385S011000, C385S042000, C385S014000, C385S129000, C385S130000

Reexamination Certificate

active

07389033

ABSTRACT:
A planar lightwave circuit type variable optical attenuator with a small polarization dependent loss is provided. By setting the waveguide birefringence (absolute value) in first and second optical coupler sections equal to or greater than 3.5×10−4, the polarization mode coupling is made equal to or less than −25 dB, and the effect of the polarization dependence caused by the polarization mode coupling at the cross port of the first and second optical couplers is suppressed. In addition to or independently of this, the arm waveguide length can be designed to be equal to an integer multiple of the optical beat length obtained by dividing a used optical wavelength by the waveguide birefringence.

REFERENCES:
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patent: 6507680 (2003-01-01), Nishimura et al.
patent: 6714706 (2004-03-01), Kambe
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patent: 2004/0141691 (2004-07-01), Wiesmann et al.
patent: 2001-507817 (2001-06-01), None
patent: 2004-133389 (2004-04-01), None
patent: WO 98/29769 (1998-07-01), None
Yasuyuki Inoue et al.,Polarization Sensitivity of a Silica Waveguide Thermooptic Phase Shifter for Planar Lightwave Circuits, IEEE, Photonics Technology Letters, vol. 4, No. 1, Jan. 1992, pp. 36-38.
Na Young Kim et al,Limitation of PMD Compensation Due to Polarization-Dependent Loss in High-Speed Optical Tramsmission Links, IEEE, Photonics Technology Letters, vol. 14, No. 1, Jan. 2002, pp. 104-105.
G. Heise et al.,Simple Model for Polarization Sensitivity of Silica Waveguide Mach-Zehnder Interferometer, IEEE, Photonic Technology Letters, vol. 17, No. 10, Oct. 2005, pp. 2116-2118.
R. Narevich et al.,Novel Wide-Band Low-PDL Integrated Variable Optical Attenuator in Silica-on-Silicon, Optical Fiber Communication Conference, Technical Digest OFC/NFOEC, vol. 4, 2005.

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