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3.
Appl Opt ; 46(13): 2387-93, 2007 May 01.
Article in English | MEDLINE | ID: mdl-17429449

ABSTRACT

Surface-relief fiber Bragg gratings exhibit substantially more polarization dependence than standard fiber Bragg gratings. Using D-fiber with different core orientations, surface-relief gratings are analyzed and fabricated to determine the polarization dependence. We show that the largest Bragg reflection occurs for the polarization state with a dominant TE field component parallel to the flat surface of the fiber. The polarization dependence is adjusted by changing the index of refraction of the surrounding media and by fabricating the surface relief grating using rotated core D-fiber.

4.
Appl Opt ; 45(8): 1669-75, 2006 Mar 10.
Article in English | MEDLINE | ID: mdl-16572680

ABSTRACT

We present a new type of fiber Bragg grating (FBG) in which we etch the grating into the flat surface of a D-shaped optical fiber. Instead of being written in the core of the fiber, as are standard FBGs, these surface-relief FBGs are placed in the cladding above the core. These gratings are a viable alternative to standard FBGs for sensing applications. We describe the fabrication process for etching Bragg gratings into the surface of D-fibers and demonstrate their performance as temperature sensors.


Subject(s)
Environmental Monitoring/instrumentation , Fiber Optic Technology/instrumentation , Refractometry/instrumentation , Transducers , Environmental Monitoring/methods , Equipment Design , Equipment Failure Analysis , Optical Fibers , Refractometry/methods
5.
Appl Opt ; 44(1): 22-6, 2005 Jan 01.
Article in English | MEDLINE | ID: mdl-15662880

ABSTRACT

We present a method of replacing a section of the core of a D-shaped optical fiber with sensing materials as a platform for various extrinsic fiber sensors. In this configuration light guides within the sensing material allow for strong interaction between the sensing material and the optical field. Initial experimental results indicate that replacing the fiber core with polymer enhances its temperature sensitivity by at least a factor of 5. The new technique is promising as a means for incorporating various sensing materials into the path of a beam traveling in an optical fiber.

6.
Appl Opt ; 43(4): 933-9, 2004 Feb 01.
Article in English | MEDLINE | ID: mdl-14960088

ABSTRACT

We present a method for fabricating an in-fiber electro-optic polymer waveguide within a D-shaped optical fiber. A combined process of selective chemical etching and spin coating creates a 2-cm in-fiber poly(methyl methacrylate)-DR1 dye polymer waveguide section with an overall insertion loss of micro 1.6 dB at 1550 nm. Numerical simulations show that, for in-fiber polymer waveguides to have low loss, the polymer layer's thickness must be kept below a certain value so that it will not support slab waveguide modes. Long transition regions between the unetched fiber and the polymer waveguide section also reduce loss. We analyze the efficiency of an in-fiber polymer waveguide by simulating its theoretical performance as an electro-optic modulator.

7.
Appl Opt ; 42(36): 7121-5, 2003 Dec 20.
Article in English | MEDLINE | ID: mdl-14717286

ABSTRACT

The partial removal of a section of the core from a continuous D-shaped optical fiber is presented. In the core removal process, selective chemical etching is used with hydrofluoric (HF) acid. A 25% HF acid solution removes the cladding material above the core, and a 5% HF acid solution removes the core. A red laser with a wavelength of 670 nm is transmitted through the optical fiber during the etching. The power transmitted through the optical fiber is correlated to the etch depth by scanning electron microscope imaging. The developed process provides a repeatable method to produce an optical fiber with a specific etch depth.

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