Method and apparatus for writing grating structures using controlled phase delay between beams
First Claim
1. A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising:
- providing at least two light beams which overlap in an overlap region to form an interference pattern;
moving the photosensitive waveguide through the overlap region; and
modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties.
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Abstract
A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising providing at least two light beams which overlap in an overlap region to form an interference pattern; moving the photosensitive waveguide through the overlap region; and modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties. The apparent movement of the interference pattern may be variably controlled to match the movement of the waveguide, or to be deliberately detuned. The grating structure may be chirped or apodized.
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Citations
26 Claims
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1. A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising:
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providing at least two light beams which overlap in an overlap region to form an interference pattern;
moving the photosensitive waveguide through the overlap region; and
modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for variably controlling the apparent movement of an interference pattern with reference to a moving photosensitive waveguide to write a grating structure in the photosensitive waveguide, the apparatus comprising:
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at least one light beam source for providing at least two light beams;
a beam director for directing at least one of the light beams so that the light beams overlap in an overlap region to form the interference pattern;
at least one non-mechanical beam modulator for modulating the phase of at least one of the light beams relative to the phase of the other light beams so that the interference pattern appears to move through the overlap region; and
a beam modulator controller for controlling the modulation of the beam modulator so that the apparent movement of the interference pattern is variably controlled in response to the movement of the photosensitive waveguide. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification