Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2001-01-10
2003-07-22
Kim, Robert H. (Department: 2882)
Optical waveguides
With optical coupler
Switch
C385S016000, C385S024000, C385S017000
Reexamination Certificate
active
06597827
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical fiber based communications network, and more particularly to an optical switch arrangement that provides reduced control voltages in Integrated Control Systems (“ICS”) of mirrors.
2. Discussion of the Related Art
In recent years, Internet usage and other computer communications modes have become widespread. Moreover, audio and video applications that are becoming increasingly popular require large amounts of information (bandwidth) to be transferred. As a result, demands on the bandwidth supported by communications systems have skyrocketed. Optical communication systems have become increasingly important to fulfill such needs.
Such optical communications systems are capable of rapidly transferring large volumes of information by converting electrical signals into light signals and transmitting the light through optical fibers. The optical fibers form a network of optical paths between different geographic locations (e.g., different metropolitan areas). To route the information between the different locations, the information is switched between different optical paths. Conventionally, the information is switched by converting the optical signals into electrical signals, switching the electrical signals, reconverting the electrical signals to optical signals and re-transmitting the optical signals onto the desired optical path.
With advances in optical communications technology, optical switches (such as micro-mirror switches) are being developed to provide large switching fabrics that operate in the optical domain and can switch more information faster than electrical switches. Input and output coupling may be achieved by aligning an optical fiber, a collimating lens, and the mirror chip at both the inputs and the outputs.
Moreover, applications involving long distance optical paths at high bit rates (>Gbs) require the use of optical fibers requiring having tight fabrication tolerances to avoid optical loss if strict angular tolerances (within 0.01 degrees) are not achieved. In addition, such optical fibers have a small core diameter and a small numerical aperture. The small numerical aperture implies that the cone of light that can be accepted by the optical fiber is narrow. Hence, for reasons such as these, through-put is easily decreased if the light is not properly focused or if the light is diminished in intensity, thereby potentially causing signal loss or signal deterioration.
To successfully operate optical switches, the mirrors must be precisely aligned and the distance between mirrors reflecting a beam to connect fibers should be minimized. If the angular position of the steerable mirrors is off and/or if the mirrors are too far apart, some or all of the light from the input fiber will not reach the selected output fiber. The control voltages used by the Integrated Control Systems (“ICS”) for steering the mirrors can be as high as 100 to 200 volts. There remains a need in the art for an optical switch having an Integrated Control System (“ICS”) with lower control voltages in order to use lower voltage electronics and reduce other problems associated with high voltage switching.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to an optical switch that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An objective of the present invention is to provide a reduced voltage Integrated Control System for control of mirrors in an optical switching system.
Another objective of the present invention is to reduce the voltage on an integrated control system that controls mirrors in an optical switching system.
Another objective of the present invention is to reduce power consumption in the integrated control system that controls mirrors in an optical switching system by reducing the operating voltage of the integrated control system.
Additional features and advantages of the invention will be set forth in the description, which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, an optical switch includes a substrate; an array of actuation substrates positioned above the substrate; and an actuation substrate including a steerable mirror for reflecting an optical signal, wherein the steerable mirror is connected by an electrically conductive path to a potential bias having a magnitude greater than zero.
In another aspect, a method of switching optical signals includes receiving an optical signal; and using a mirror to output the received optical signal from the optical switch, wherein the mirror is connected by an electrically conductive path to a potential bias having a magnitude greater than zero.
Another aspect is an optical switch including a substrate; an array of actuation substrates positioned above the substrate; the actuation substrates including a steerable mirror for reflecting an optical signal; and trench isolation between the actuation substrates.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 5080504 (1992-01-01), Partain et al.
patent: 5771321 (1998-06-01), Stern
patent: 6253001 (2001-06-01), Hoen
Bonadeo Nicolas
Brener Igal
Chou Ming
Lee Shi-Sheng
Peale David
Brosemer Jeffery J.
Kim Robert H.
Tellium Inc.
Wang George
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