Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2001-05-17
2002-12-10
Healy, Brian (Department: 2874)
Optical waveguides
Accessories
Attenuator
C385S014000, C385S039000, C385S040000, C385S129000, C385S130000
Reexamination Certificate
active
06493502
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to optical devices, and more particularly to optical waveguide devices.
BACKGROUND OF THE INVENTION
In the integrated circuit industry, there is a continuing effort to increase device speed and increase device densities. Optical systems are a technology that promise to increase the speed and current density of the circuits. In long-distance waveguide applications such as fiber optic transmission lines, optical signals can be attenuated differently through different bandwidths of the optical signals. That is, a high-bandwidth portion of the optical signal can be attenuated to a different signal strength than the low-bandwidth portion of the optical signal. Dynamic gain equalizers are devices that equalize the gain for light through the multiple light bandwidths. Dynamic gain equalizers can be formed from multiple passive elements, with each passive element made from glass or clear plastic or alternatively from a semiconductor material, such as silicon.
Dynamic gain equalizers, as with most optical devices, are susceptible to changes in such operating parameters as temperature, device age, device characteristics, device age, device characteristics, contact, pressure, vibration, etc. As such, the various components of the dynamic gain equalizers are typically contained in packaging that maintains the parameters as desired. Providing such packaging is extremely expensive. Even if such packaging is provided, passive dynamic gain equalizers may be exposed to slight condition changes. Passive dynamic gain equalizers perform differently under different conditions. For example, different bandwidths of light will be attenuated to different levels depending on the conditions. If the characteristics of a passive dynamic gain equalizer is altered outside of very close tolerances, then the optical dynamic gain equalizer will not adequately perform its function. In other words, there is no adjustability for passive dynamic gain equalizers.
As such it would be desirable to provide an optical dynamic gain equalizers that can controllably equalize the strengths of multiple bandwidths of light. Additionally, it would be desirable to provide a mechanism to compensate in dynamic gain equalizers for variations in the operating parameters such as temperature and device age.
SUMMARY OF THE INVENTION
The present invention is directed to an apparatus and associated method for altering the propagation constant of a region of equalizing propagation constant in an optical waveguide. The method comprising positioning an electrode of a prescribed electrode shape proximate the waveguide. An altered region of equalizing propagation constant is projected into the waveguide that corresponds, in shape, to the prescribed electrode shape by applying a voltage to the shaped electrode. The propagation constant of the region of equalizing propagation constant is controlled by varying the voltage.
REFERENCES:
patent: 4261638 (1981-04-01), Wagner
patent: 4422088 (1983-12-01), Gfeller
patent: 4677783 (1987-07-01), Cratsa
patent: 4695120 (1987-09-01), Holder
patent: 4728167 (1988-03-01), Soref et al.
patent: 4758092 (1988-07-01), Heinrich et al.
patent: 4761620 (1988-08-01), Bar-Joseph et al.
patent: 4865427 (1989-09-01), Kingston et al.
patent: 4871224 (1989-10-01), Karstensen
patent: 4917450 (1990-04-01), Pocholle
patent: 4939793 (1990-07-01), Stewart
patent: 4966430 (1990-10-01), Weidel
patent: 5004447 (1991-04-01), Soref
patent: 5061027 (1991-10-01), Richard
patent: 5153770 (1992-10-01), Harris
patent: 5159700 (1992-10-01), Reid et al.
patent: 5198684 (1993-03-01), Sudo
patent: 5400419 (1995-03-01), Heinen
patent: 5432630 (1995-07-01), Lebby et al.
patent: 5434434 (1995-07-01), Kasahara et al.
patent: 5485021 (1996-01-01), Abe
patent: 5502779 (1996-03-01), Magel
patent: 5568574 (1996-10-01), Tanguay, Jr. et al.
patent: 5605856 (1997-02-01), Goosen et al.
patent: 5625636 (1997-04-01), Bryan et al.
patent: 5625729 (1997-04-01), Brown
patent: 5629838 (1997-05-01), Knight et al.
patent: 5638469 (1997-06-01), Feldman et al.
patent: 5696862 (1997-12-01), Hauer et al.
patent: 5710846 (1998-01-01), Wayman et al.
patent: 5835646 (1998-11-01), Yoshimura et al.
patent: 5864642 (1999-01-01), Chun et al.
patent: 5872360 (1999-02-01), Paniccia et al.
patent: 5875271 (1999-02-01), Laughlin
patent: 5880491 (1999-03-01), Soref et al.
patent: 5926601 (1999-07-01), Tai et al.
patent: 6002515 (1999-12-01), Mizuuchi et al.
patent: 6021248 (2000-02-01), Cornish et al.
patent: 6075908 (2000-06-01), Paniccia et al.
patent: 6088496 (2000-07-01), Asghari
patent: 6114994 (2000-09-01), Soref et al.
patent: 6122419 (2000-09-01), Kurokawa et al.
patent: 6163632 (2000-12-01), Rickman et al.
patent: 6166846 (2000-12-01), Maloney
patent: 6177685 (2001-01-01), Teraguchi et al.
patent: 6188818 (2001-02-01), Han et al.
patent: 6222689 (2001-04-01), Higuchi et al.
patent: 6233070 (2001-05-01), Lu et al.
patent: 6236778 (2001-05-01), Laughlin
patent: 6282357 (2001-08-01), Kadota et al.
patent: 6289699 (2001-09-01), Kewitsch et al.
patent: 6333806 (2001-12-01), Onaka et al.
patent: 2001/0031112 (2001-10-01), Frish et al.
patent: 2001/0031113 (2001-10-01), Frish et al.
patent: WO-98/35253 (1998-08-01), None
patent: WO-99/12062 (1999-03-01), None
patent: WO-99/24867 (1999-05-01), None
patent: WO-99/63373 (1999-12-01), None
patent: WO-00/02071 (2000-01-01), None
patent: WO-00/10039 (2000-02-01), None
patent: WO-00/25156 (2000-05-01), None
patent: WO-00/49451 (2000-08-01), None
patent: WO-00/58776 (2000-10-01), None
patent: WO-01/50166 (2001-07-01), None
Michael C. Parker et al., Applications of Active Arrayed-Waveguide Gratings in Dynamic WDM Networking and Routing, Journal of Lightwave Technology, vol. 18, No. 12, Dec. 2000.
Bardia Pezeshki et al., Vertical Cavity Devices as Wavelength Selective Waveguides, Journal of Lightwave Technology, vol. 12, No. 10, Oct. 1994.
Lucent Technologies, Bell Labs Innovations, Arrayed Waveguide Grating Multiplexer/Demultiplexer, Jan. 2000.
Robert Shi and Tomasz Jannson, Optical Interconnection Foundations and Applications, Chapter 5, Integrated Optical Waveguide Routing—Micro-optics, Artech House, pp. 141-225.
Amalia N. Miliou et al., A 1.3 &mgr;m Directional Coupler Polarization Splitter by Ion Exchange, Journal of Lightwave Technology, vol. 11, No. 2, Feb. 1993.
Gijs J. M. Krijnen et al., A New Method for the Calculation of Propagation constants and Field Profiles of Guided Modes of Nonlinear Channel Waveguides Based on the Effective Index Method, Journal of Lightwave Technology, vol. 12, No. 9, Sep. 1994.
Healy Brian
Lin Tina M
Morgan & Lewis & Bockius, LLP
Optronx, Inc.
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