Thermal compensated compact bragg grating filter
First Claim
1. A thermal compensated Bragg grating filter comprising:
- a compensating member having an inner surface defining a bore disposed therethrough between a first end and a second end along a longitudinal axis;
a torsion adjusting member having an inner surface defining a bore disposed therethrough rotatably mounted at said first end of said compensating member about said longitudinal axis;
an optical fiber having a Bragg grating portion between a first attachment point and a second attachment point;
said second attachment point of said optical fiber affixed to said inner surface of said compensating member proximate to said second end of said compensating member along said longitudinal axis of said compensating member; and
said first attachment point of said optical fiber affixed to said inner surface of said torsion adjusting member, said first attachment point being offset from said longitudinal axis.
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Accused Products
Abstract
Various aspects of thermal compensated Bragg grating filters are disclosed. In one disclosed aspect, an optical fiber having a Bragg grating therein is laid adjacent to a torsion member, and the two are then rigidly affixed between a torsion adjusting member and a compensating member. The torsion adjusting member may then be rotated, twisting the optical fiber around the torsion member, and thus applying torsion to the optical fiber containing the Bragg grating, and changing the period of the Bragg grating. A further disclosed aspect provides an optical fiber, containing a Bragg grating filter therein, which is rigidly affixed between a torsion adjusting member and a compensating member in an axis other than the compensating member'"'"'s longitudinal axis. The torsion adjusting member may then be rotated to apply torsion to the optical fiber, and change the period of the Bragg grating. Another disclosed aspect comprises an optical fiber, containing a Bragg grating filter therein, and a compensating member having a desired thermal coefficient of expansion. The optical fiber is bent through a curve and affixed to the compensating member such that torsion is applied to the Bragg grating region of the optical fiber.
33 Citations
15 Claims
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1. A thermal compensated Bragg grating filter comprising:
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a compensating member having an inner surface defining a bore disposed therethrough between a first end and a second end along a longitudinal axis;
a torsion adjusting member having an inner surface defining a bore disposed therethrough rotatably mounted at said first end of said compensating member about said longitudinal axis;
an optical fiber having a Bragg grating portion between a first attachment point and a second attachment point;
said second attachment point of said optical fiber affixed to said inner surface of said compensating member proximate to said second end of said compensating member along said longitudinal axis of said compensating member; and
said first attachment point of said optical fiber affixed to said inner surface of said torsion adjusting member, said first attachment point being offset from said longitudinal axis. - View Dependent Claims (3, 7, 8, 9, 10)
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2. A thermal compensated Bragg grating filter comprising:
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a compensating member having an inner surface defining a bore disposed therethrough between a first end and a second end along a longitudinal axis;
a torsion adjusting member having an inner surface defining a bore disposed therethrough rotatably mounted at said first end of said compensating member about said longitudinal axis;
an optical fiber having a Bragg grating portion between a first attachment point and a second attachment point;
at least one torsion member having third attachment point and a fourth attachment point;
said second attachment point of said optical fiber and said third attachment point of said at least one torsion member radially disposed about said longitudinal axis of said compensating member and affixed to said inner surface of said compensating member proximate to said second end of said compensating member; and
said first attachment point of said optical fiber and said fourth attachment point of said at least one torsion member radially disposed about said longitudinal axis of said compensating member and affixed to said inner surface of said torsion adjusting member. - View Dependent Claims (4, 5, 6)
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11. A method for thermally compensating a Bragg grating filter comprising:
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providing an optical fiber having a Bragg grating portion therein;
providing a compensating member having a desired thermal coefficient of expansion; and
twisting and mounting said optical fiber in torsional stress to said compensating member.
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12. A method for thermally compensating a Bragg grating filter comprising:
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providing an optical fiber having a Bragg grating portion therein;
providing a compensating member having a desired thermal coefficient of expansion;
twisting said optical fiber to provide a predetermined amount of torsional stress;
bending said Bragg grating portion of said optical fiber through a curve; and
mounting said Bragg grating portion of said optical fiber to said compensating member.
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13. A method for thermally compensating a Bragg grating filter comprising:
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providing an optical fiber having a Bragg grating portion therein;
providing a compensating member having a desired thermal coefficient of expansion;
twisting said Bragg grating portion of said optical fiber; and
mounting said Bragg grating portion of said optical fiber to said compensating member.
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14. A method for thermally compensating a Bragg grating filter comprising:
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providing an optical fiber having a Bragg grating portion therein;
providing a torsion member;
to providing a compensating member having a desired thermal coefficient of expansion;
twisting said Bragg grating portion of said optical fiber around said torsion member; and
mounting said Bragg grating portion of said optical fiber and said torsion member to said compensating member.
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15. A thermal compensated Bragg grating filter comprising:
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a compensating member having an inner surface defining a bore disposed therethrough between a first end and a second end along a longitudinal axis;
a torsion adjusting member having an inner surface defining a bore disposed therethrough rotatably mounted at said first end of said compensating member about said longitudinal axis;
an optical fiber having a Bragg grating portion between a first attachment point and a second attachment point;
said second attachment point of said optical fiber affixed to said inner surface of said compensating member proximate to said second end of said compensating member, said second attachment point being offset from said longitudinal axis; and
said first attachment point of said optical fiber affixed to said inner surface of said torsion adjusting member, said first attachment point being offset from said longitudinal axis.
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Specification