Single-ended long period grating optical device
First Claim
Patent Images
1. A single-ended optical device comprising:
- an optical waveguide having at least one core mode and a plurality of cladding modes;
at least one long period grating disposed within the optical waveguide wherein the long period grating couples light from the core mode to the cladding modes;
a reflector, positioned in an operable relationship to the long period grating, wherein the reflector reflects a signal; and
a mode stripper, positioned after the long period grating, wherein the mode stripper removes the cladding modes from a transmitted signal and the reflected signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A single-ended long period grating optical device is presented. The single-ended optical device comprises an optical waveguide having at least one core mode and a plurality of cladding modes. At least one long period grating couples light from the core mode to the cladding modes. A reflector is positioned in an operable relationship to the long period grating, and the reflector reflects a signal. A mode stripper is positioned after the long period grating and removes the cladding modes from a transmitted signal and the reflected signal.
195 Citations
49 Claims
-
1. A single-ended optical device comprising:
-
an optical waveguide having at least one core mode and a plurality of cladding modes;
at least one long period grating disposed within the optical waveguide wherein the long period grating couples light from the core mode to the cladding modes;
a reflector, positioned in an operable relationship to the long period grating, wherein the reflector reflects a signal; and
a mode stripper, positioned after the long period grating, wherein the mode stripper removes the cladding modes from a transmitted signal and the reflected signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A single-ended optical device comprising:
-
a) a fiber-optic waveguide comprising a core having at least one core mode;
a cladding surrounding the core, wherein the cladding has a refractive index and supports a plurality of cladding modes; and
at least one long period grating disposed within the core wherein the long period grating couples light from the core mode to the cladding modes;
b) a reflector, positioned in an operable relationship to the long period grating, wherein the reflector reflects a signal; and
c) a mode stripper, positioned after the long period grating, wherein the mode stripper removes the cladding modes from a transmitted signal and the reflected signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A process for preparing a single-ended optical device, the process comprising the steps of:
-
a) providing an optical waveguide having a first end and a second end, a core and a cladding;
b) writing a long period grating into the optical waveguide core;
c) modifying the cladding between the long period grating and the second end to change propagation conditions in the waveguide wherein cladding mode light is removed from a reflected signal;
d) modifying the optical waveguide at the second end to make the cladding and the core essentially flat; and
e) depositing a reflector on the modified second end of the optical waveguide. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
a) positioning a broadband light source at the first end of the optical waveguide;
b) positioning a splitter, having a first input, a second input, and at least one output, between the broadband light source and the long period grating, wherein the broadband light source is coupled to the first input; and
c) coupling a detector to the second input.
-
-
31. A single-ended optical device prepared by the process according to claim 30.
-
32. A single-ended optical device prepared by the process according to claim 22.
-
33. A process for preparing a single-ended optical device, the process comprising the steps of:
-
a) providing an optical waveguide having a first end and a second end, a core and a cladding;
b) writing a long period grating into the optical waveguide core;
c) providing a mode stripper after the long period grating;
d) modifying the optical waveguide at the second end to make the cladding and the core essentially flat; and
e) depositing a reflector on the flat core of the optical waveguide. - View Dependent Claims (34, 35, 36, 37, 38, 39)
a) positioning a broadband light source at the first end of the optical waveguide;
b) positioning a splitter, having a first input, a second input, and at least one output, between the broadband light source and the long period grating, wherein the broadband light source is coupled to the first input; and
c) coupling a detector to the second input.
-
-
38. A single-ended optical device prepared by the process according to claim 37.
-
39. A single-ended optical device prepared by the process according to claim 33.
-
40. A process for detecting changes in an environmental parameter, the process comprising the steps of:
-
a) providing a single-ended optical device comprising;
an optical waveguide having a core, a cladding, a first end, and a second end;
at least one long period grating disposed within the core;
a broadband light source positioned at the first end of the optical waveguide;
a splitter positioned between the broadband light source and the long period grating, wherein the broadband light source is coupled to a first input of the splitter and wherein a detector is coupled to a second input of the splitter;
a reflector positioned in an operable relationship to the long period grating and opposite from the broadband light source; and
a mode stripper positioned after the long period grating;
b) launching light into the optical waveguide core wherein the light contacts the long period grating and is coupled to cladding modes;
c) exposing the single-ended optical device to an environmental parameter;
d) stripping the light from the cladding modes;
e) reflecting the remaining light back through the long period grating; and
f) detecting a spectral profile of the reflected light. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
-
Specification