Optical waveguides – With optical coupler
Reexamination Certificate
2001-08-06
2003-09-02
Zarroli, Michael C. (Department: 2839)
Optical waveguides
With optical coupler
C385S037000
Reexamination Certificate
active
06614951
ABSTRACT:
BACKGROUND
1. Field of the Invention
The invention relates to one or more optical networking components. In particular, the invention relates to optical components having a flat top output.
2. Background of the Invention
The wavelength division multiplexing technique allows a waveguide to carry more than one channel of information in a multichannel beam of light. Each channel is carried on a light signal having a unique wavelength.
A demultiplexer is typically employed to separate the channels in a multichannel beam. Separating the channels allows the channels to be independently processed. The demultiplexer receives the multichannel beam on an input waveguide and outputs each of the channels on a different output waveguide. Accordingly, each output waveguide is typically associated with a particular channel.
The intensity versus wavelength profile of the light in each output waveguide typically peaks at the wavelength associated with a particular channel. However, the wavelengths of light that appears on a particular output waveguide can shift. For instance, temperature changes can affect the index of refraction of materials in the demultiplexer. This change in the index of refraction can cause the wavelengths of light that appear on an output waveguide to shift. This shift can cause the intensity distribution seen on a particular output waveguide to shift away from the peak in the intensity versus wavelength profile. As a result, these shifts can cause a drop in the intensity of the signal in a particular output channel. This drop in the intensity is a source of optical loss in the optical network.
For the above reasons, there is a need for a demultiplexer that is not associated with optical losses that result from a shift in the wavelengths of light that are provided on a particular output waveguide.
SUMMARY OF THE INVENTION
The invention relates to an optical component. The optical component is configured to receive a light signal through an inlet port and distribute the light signal across an output side. The light distribution component is configured such that a light signal received through the inlet port with a non-periodic intensity distribution is distributed across the output side with a periodic intensity distribution. The periodic intensity distribution function can substantially approximate a sinc function. In some instances, the light distribution component is defined in a light transmitting medium positioned on a base.
The optical component can include a plurality of array waveguides configured to receive the light signal distributed across the output side of the light distribution component. The optical component can also include an input waveguide connected to the inlet port.
Another embodiment of the optical component includes a plurality of array waveguides defined a light transmitting medium positioned on a base, the array waveguides being defined such that each array waveguides has an inlet port. The optical component also includes a light distribution component defined in the light transmitting. The light distribution component is configured to receive a light signal through an inlet port and to distribute the light signal to the inlet ports of the array waveguides. The light distribution component is also configured such that a light signal received through the inlet port with a non-periodic intensity distribution is distributed to inlet ports of the array waveguides with a periodic intensity distribution.
Another embodiment of the optical component includes an array waveguide grating having a plurality of array waveguides. The optical component also includes an light distribution component configured to receive a light signal through an inlet port and distribute the light signal to a plurality of the array waveguides. The optical component further includes an output light distribution component configured to receive the light signal distributed to the array waveguides. The light distribution component is configured such that a light signal received through the inlet port with a non-periodic intensity distribution is received in the output light distribution component with a periodic intensity distribution. The period intensity distribution can have a shape that approximates a sinc function.
In some instances, the output light distribution component is configured to focus the received light signal on one or more output waveguides.
The optical component can include a light signal carrying region extending through the light distribution component. One or more obstructions are positioned in the light signal carrying region. The one or more obstructions are configured to obstruct a portion of the light signal traveling through the light signal carrying region. The one or more obstructions can include one or more columns extending through the light signal carrying region. In some instances, one or more columns are each a column of air. The one or more obstructions can define an opening through which the light signal can travel.
The optical component can include a collimator for collimating the light signal. The collimator can be positioned between the collimator and the inlet port. In some instances, the collimator is included in an input waveguide that ends at the inlet port.
The invention also relates to a method of operating an optical component. The method includes receiving a light signal through an inlet port of a light distribution component and distributing the light signal across an output side of the light distribution component such that the light signal. The method also includes diffracting the light signal such that the light signal is distributed across the output side with a substantially sinc shaped intensity distribution. The light distribution component can be defined in a light transmitting medium positioned on a base.
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Law Offices of Travis L. Dodd
Lightcross, Inc.
Zarroli Michael C.
LandOfFree
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