Single mode (SM) fiber optical reader system and method for interrogating resonant waveguide-grating sensor(s)
First Claim
1. A system, comprising:
- a light source;
a light detector; and
a launch/receive system which includes;
a single mode optical fiber; and
a lens, wherein said single mode optical fiber is interfaced with said light source and said light detector, wherein said single mode optical fiber is physically separated from said lens and said lens is physically separated from a biosensor, wherein said single mode optical fiber emits a light beam generated by said light source such that the emitted light beam is focused by said lens before interfacing at a substantially normal incidence with the biosensor, wherein said biosensor reflects the light beam such that the reflected light beam passes through said lens and said single mode optical fiber and is received by said light detector.
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Abstract
An optical reader system is described herein which has a single mode (SM) optical fiber launch/receive system that uses one or more SM optical fibers to interrogate a biosensor and does not use multimode (MM) optical fibers to interrogate the biosensor. The use of the SM optical fiber launch/receive system effectively reduces angular sensitivity, reduces unwanted system reflections, improves overall angular tolerance, and improves resonant peak reflectivity and resonant peak width. Two specific embodiments of the SM optical fiber launch/receive system are described herein which include: (1) a dual fiber collimator launch/receive system; and (2) a single fiber launch/receive system that interrogates the biosensor at a normal incidence.
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Citations
16 Claims
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1. A system, comprising:
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a light source; a light detector; and a launch/receive system which includes; a single mode optical fiber; and a lens, wherein said single mode optical fiber is interfaced with said light source and said light detector, wherein said single mode optical fiber is physically separated from said lens and said lens is physically separated from a biosensor, wherein said single mode optical fiber emits a light beam generated by said light source such that the emitted light beam is focused by said lens before interfacing at a substantially normal incidence with the biosensor, wherein said biosensor reflects the light beam such that the reflected light beam passes through said lens and said single mode optical fiber and is received by said light detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for interrogating a biosensor, said method comprising the steps of:
using a launch/receive system which has a single mode optical fiber incorporated therein to interrogate the biosensor and does not have a multimode optical fiber incorporated therein to interrogate the biosensor, wherein said launch/receive system includes; a single mode optical fiber; and a lens, wherein said single mode optical fiber is interfaced with said light source and said light detector, wherein said single mode optical fiber is physically separated from said lens and said lens is physically separated from a biosensor, wherein said single mode optical fiber emits a light beam generated by said light source such that the emitted light beam is focused by said lens before interfacing at a substantially normal incidence with the biosensor, wherein said biosensor reflects the light beam such that the reflected light beam passes through said lens and said single mode optical fiber and is received by said light detector. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification