Alan Kersey - Academia.edu (original) (raw)

Papers by Alan Kersey

We demonstrate a two-mode elliptical-core fiber strain sensorremotely interrogated over lead-inse... more We demonstrate a two-mode elliptical-core fiber strain sensorremotely interrogated over lead-insensitive single-mode fiber using pseudo- heterodyne demodulation. In addition, preliminary results obtaineddemonstrate FMCW multiplexing of two elliptical-core fiber sensors in a'single-fiber' configuration.

SPIE Proceedings, 1987

A polarization-insensitive detection technique for coherent heterodyne fiber communications is de... more A polarization-insensitive detection technique for coherent heterodyne fiber communications is described. The technique utilizes a dual-IF detection scheme derived by mixing the signal light with orthogonally polarized and frequency offset components of the local oscillator. Experimental results obtained using both bulk-optic and an integrated-optic, polarization selective phase modulator to provide the necessary LO polarization mode differential frequency offset are reported.

Abstract : A wavelength determination system and method for addressing a plurality of strings of ... more Abstract : A wavelength determination system and method for addressing a plurality of strings of Bragg grating sensors using a single digitally controlled narrowband optical filter.

CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics

CThQ4 Fig. 1 Experimental setup of high spatial resolution reflectometry by use of synthe-sis of ... more CThQ4 Fig. 1 Experimental setup of high spatial resolution reflectometry by use of synthe-sis of optical coherence function for measuring reflectivity distribution at a long distance. ... 5 km 20 m Im m m U, I] Optical fiber Connector Connector -20 ~ ~ " ~ ~ " ' I ' ' ' ~ ' ' ' " - Measuring ...

Fibre Optics '88, 1988

ABSTRACT We present an analysis of the dependence of the fringe visibility on input polarization ... more ABSTRACT We present an analysis of the dependence of the fringe visibility on input polarization in two-beam interferometric sensors, and discuss three techniques which can be used to overcome polarization induced fading in such sensor systems. The principle of operation and experimental performance of each scheme is discussed.

Fibre Optics '87, 1987

ABSTRACT A number of optical and opto-electronic techniques have been developed for the demodulat... more ABSTRACT A number of optical and opto-electronic techniques have been developed for the demodulation of inthrferometric fiber optic sensor (IFOS) in recent years. Many of these techniques allow passive operation of the actual sensor, and may find application in certain IFOS multiplexing topologies. This paper will briefly review IFOS demodulation techniques, highlighting which are applicable to multiplexing, and comparing practical performance features such as sensitivity, bandwidth, dynamic range and linearity. Recent advances in the area of passive demodulation and multiplexing will then be discussed.

A new serial interferometric fiber-optic sensor array configuration is disclosed. In a preferred ... more A new serial interferometric fiber-optic sensor array configuration is disclosed. In a preferred embodiment of the invention pulsed light from a laser source is transmitted into a long input fiber which forms a series of N sensor elements, each of optical path length L. Each sensor element is responsive to any change in an associated predetermined physical parameter for changing its optical path length. A small portion of the optical power in the input fiber is tapped-off to a long output fiber at tap points between adjacent sensor elements and at tap points before the first and after the last sensor elements in order to produce at the output of the last sensor a series of N + 1 pulses separated in the time domain. This series of N + 1 pulses from the output of the last sensor element is applied to each of two paths in a compensating interferometric of optical path imbalance L. The compensating interferometer coherently mixes pulses obtained from each adjacent pair of tap points to ...

Fiber Optic and Laser Sensors VI, 1989

ABSTRACT Recently, we reported a new interferometric fiber sensor array architecture based on a t... more ABSTRACT Recently, we reported a new interferometric fiber sensor array architecture based on a transmissive tapped serial sensor network which, like the reflectometric Fabry-Perot array configuration, exhibits intrinsic optical crosstalk between the sensor elements in the array. In this paper we discuss the origin of these crosstalk effects in both array topologies, and present theoretical models which predict the level of crosstalk between individual sensor elements in each type of array.

SPIE Proceedings, 1994

The use of nonlinear strain transduction techniques with fiber Bragg grating sensor elements is r... more The use of nonlinear strain transduction techniques with fiber Bragg grating sensor elements is reported. Configurations for displacement and magnetic field sensing are discussed, and techniques to allow the multiplexing of a number of devices along a single fiber path are described.

Fiber Optic Gyros: 15th Anniversary Conf, 1992

The present, simplified analog signal-processing technique for an open-loop FOG is based on Kerse... more The present, simplified analog signal-processing technique for an open-loop FOG is based on Kersey and Moeller's (1990) closed-loop phase-shift-nulling concept. This approach emulates the operation of a true closed-loop gyroscope on the basis of low-cost phase ...

Proceedings of Optical Fiber Communication Conference (

... 2. WW Morey, JR Dunphy G. Meltz, Proc. SPIE 1586, 216-224 (1991). 3. SM Melle et aL, Photon. ... more ... 2. WW Morey, JR Dunphy G. Meltz, Proc. SPIE 1586, 216-224 (1991). 3. SM Melle et aL, Photon. Technol. Lett. 5,263-265 (1993). 4. AD Kersey, TA Berkoff, WW Morey, Opt. Lett. (Jan 1993). 5. MA Davis and AD Kersey, IEEE J. Lightwave Technol. 13, 1289 (1995). ...

We demonstrate a two-mode elliptical-core fiber strain sensorremotely interrogated over lead-inse... more We demonstrate a two-mode elliptical-core fiber strain sensorremotely interrogated over lead-insensitive single-mode fiber using pseudo- heterodyne demodulation. In addition, preliminary results obtaineddemonstrate FMCW multiplexing of two elliptical-core fiber sensors in a'single-fiber' configuration.

SPIE Proceedings, 1987

A polarization-insensitive detection technique for coherent heterodyne fiber communications is de... more A polarization-insensitive detection technique for coherent heterodyne fiber communications is described. The technique utilizes a dual-IF detection scheme derived by mixing the signal light with orthogonally polarized and frequency offset components of the local oscillator. Experimental results obtained using both bulk-optic and an integrated-optic, polarization selective phase modulator to provide the necessary LO polarization mode differential frequency offset are reported.

Abstract : A wavelength determination system and method for addressing a plurality of strings of ... more Abstract : A wavelength determination system and method for addressing a plurality of strings of Bragg grating sensors using a single digitally controlled narrowband optical filter.

CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics

CThQ4 Fig. 1 Experimental setup of high spatial resolution reflectometry by use of synthe-sis of ... more CThQ4 Fig. 1 Experimental setup of high spatial resolution reflectometry by use of synthe-sis of optical coherence function for measuring reflectivity distribution at a long distance. ... 5 km 20 m Im m m U, I] Optical fiber Connector Connector -20 ~ ~ " ~ ~ " ' I ' ' ' ~ ' ' ' " - Measuring ...

Fibre Optics '88, 1988

ABSTRACT We present an analysis of the dependence of the fringe visibility on input polarization ... more ABSTRACT We present an analysis of the dependence of the fringe visibility on input polarization in two-beam interferometric sensors, and discuss three techniques which can be used to overcome polarization induced fading in such sensor systems. The principle of operation and experimental performance of each scheme is discussed.

Fibre Optics '87, 1987

ABSTRACT A number of optical and opto-electronic techniques have been developed for the demodulat... more ABSTRACT A number of optical and opto-electronic techniques have been developed for the demodulation of inthrferometric fiber optic sensor (IFOS) in recent years. Many of these techniques allow passive operation of the actual sensor, and may find application in certain IFOS multiplexing topologies. This paper will briefly review IFOS demodulation techniques, highlighting which are applicable to multiplexing, and comparing practical performance features such as sensitivity, bandwidth, dynamic range and linearity. Recent advances in the area of passive demodulation and multiplexing will then be discussed.

A new serial interferometric fiber-optic sensor array configuration is disclosed. In a preferred ... more A new serial interferometric fiber-optic sensor array configuration is disclosed. In a preferred embodiment of the invention pulsed light from a laser source is transmitted into a long input fiber which forms a series of N sensor elements, each of optical path length L. Each sensor element is responsive to any change in an associated predetermined physical parameter for changing its optical path length. A small portion of the optical power in the input fiber is tapped-off to a long output fiber at tap points between adjacent sensor elements and at tap points before the first and after the last sensor elements in order to produce at the output of the last sensor a series of N + 1 pulses separated in the time domain. This series of N + 1 pulses from the output of the last sensor element is applied to each of two paths in a compensating interferometric of optical path imbalance L. The compensating interferometer coherently mixes pulses obtained from each adjacent pair of tap points to ...

Fiber Optic and Laser Sensors VI, 1989

ABSTRACT Recently, we reported a new interferometric fiber sensor array architecture based on a t... more ABSTRACT Recently, we reported a new interferometric fiber sensor array architecture based on a transmissive tapped serial sensor network which, like the reflectometric Fabry-Perot array configuration, exhibits intrinsic optical crosstalk between the sensor elements in the array. In this paper we discuss the origin of these crosstalk effects in both array topologies, and present theoretical models which predict the level of crosstalk between individual sensor elements in each type of array.

SPIE Proceedings, 1994

The use of nonlinear strain transduction techniques with fiber Bragg grating sensor elements is r... more The use of nonlinear strain transduction techniques with fiber Bragg grating sensor elements is reported. Configurations for displacement and magnetic field sensing are discussed, and techniques to allow the multiplexing of a number of devices along a single fiber path are described.

Fiber Optic Gyros: 15th Anniversary Conf, 1992

The present, simplified analog signal-processing technique for an open-loop FOG is based on Kerse... more The present, simplified analog signal-processing technique for an open-loop FOG is based on Kersey and Moeller's (1990) closed-loop phase-shift-nulling concept. This approach emulates the operation of a true closed-loop gyroscope on the basis of low-cost phase ...

Proceedings of Optical Fiber Communication Conference (

... 2. WW Morey, JR Dunphy G. Meltz, Proc. SPIE 1586, 216-224 (1991). 3. SM Melle et aL, Photon. ... more ... 2. WW Morey, JR Dunphy G. Meltz, Proc. SPIE 1586, 216-224 (1991). 3. SM Melle et aL, Photon. Technol. Lett. 5,263-265 (1993). 4. AD Kersey, TA Berkoff, WW Morey, Opt. Lett. (Jan 1993). 5. MA Davis and AD Kersey, IEEE J. Lightwave Technol. 13, 1289 (1995). ...