Abstract:
The spectra of Nd/sup 3+/- and Pr/sup 3+/-doped fibre lasers utilizing an intracore Bragg grating reflector written at 1.08- mu m Bragg wavelength and a dichroic mirror f...Show MoreMetadata
Abstract:
The spectra of Nd/sup 3+/- and Pr/sup 3+/-doped fibre lasers utilizing an intracore Bragg grating reflector written at 1.08- mu m Bragg wavelength and a dichroic mirror for cavity feedback have been investigated under 0.6-GHz resolution. Two oscillating frequencies corresponding to two orthogonal linear polarization states of laser emission were observed. The frequencies and orientations of the two linearly polarized emissions could be changed by varying the fiber birefringence with an inline polarization controller. A phenomenological model is proposed to explain the experimental results.<>
Published in: IEEE Photonics Technology Letters ( Volume: 4, Issue: 8, August 1992)
DOI: 10.1109/68.149882
Citations are not available for this document.
Cites in Patents (12)Patent Links Provided by 1790 Analytics
1.
Csutak, Sebastian, "CHEMICAL SENSOR USING FOUR WAVE MIXING TECHNIQUE"
Inventors:
Csutak, Sebastian
Abstract:
A sensor for measuring a property of a chemical, the sensor including: a light source; and a mixing medium in optical communication with the light source and exposed to the chemical; wherein four wave mixing of light interacting with the mixing medium provides a signal that indicates the property.
Assignee:
BAKER HUGHES INC
Filing Date:
12 December 2008
Grant Date:
06 November 2012
Patent Classes:
Current U.S. Class:
250269100
Current International Class:
G01V0050800
2.
Csutak, Sebastian, "FORCE AND ACCELERATION SENSOR USING FOUR WAVE MIXING TECHNIQUE"
Inventors:
Csutak, Sebastian
Abstract:
A sensor for measuring force, the sensor including: a light source; and a mixing medium in optical communication with the light source and exposed to the force; wherein four wave mixing of light interacting with the mixing medium provides a signal that indicates the force.
Assignee:
BAKER HUGHES INC
Filing Date:
12 December 2008
Grant Date:
28 June 2011
Patent Classes:
Current U.S. Class:
250265000, 073152020, 073152480, 073152490, 07338200R, 250225000, 250227180, 250227190, 250227230, 250256000
Current International Class:
G01V0050000, G01V0070000, G01V0031800, G01V0050400, E21B0440000, E21B0470000, G01J0050800, G01N0212500, G02F0010100
3.
Csutak, Sebastian, "TEMPERATURE AND PRESSURE SENSOR USING FOUR WAVE MIXING TECHNIQUE"
Inventors:
Csutak, Sebastian
Abstract:
A sensor for measuring at least one of temperature and pressure in a borehole, the sensor including a mixing medium disposed in a housing adapted for insertion into the borehole, the mixing medium exposed to at least one of the temperature and the pressure; wherein the mixing medium is used for four wave mixing of light to provide a signal that indicates at least one of the temperature and the pressure.
Assignee:
BAKER HUGHES INC
Filing Date:
01 November 2007
Grant Date:
06 October 2009
Patent Classes:
Current U.S. Class:
250265000, 250256000, 250263000, 250268000
Current International Class:
G01V0050000, G01V0050400
4.
Laming, Richard Ian; Zervas, Michael Nickolaos; Set, Sze Yun; Ibsen, Morten; Ronnekleiv, Erland; Yamashita, Shinji, "OPTICAL FIBER LASER"
Inventors:
Laming, Richard Ian; Zervas, Michael Nickolaos; Set, Sze Yun; Ibsen, Morten; Ronnekleiv, Erland; Yamashita, Shinji
Abstract:
A method of fabricating a distributed feedback optical fiber laser, comprises the step of exposing an optical fiber ( 20 ) to a transverse light beam ( 30 ) to form a grating structure in a section of the optical fiber, the writing light beam being polarized in a direction not parallel to the axis of the section ( 10 ) of optical fiber ( 20 ).
Assignee:
UNIVERSITY OF SOUTHAMPTON
Filing Date:
16 October 2000
Grant Date:
31 January 2006
Patent Classes:
Current U.S. Class:
430321000, 385011000, 385037000, 385123000, 430001000, 430002000
Current International Class:
G02F0013500, G02B0061600
5.
Kringlebotn, Jon Thomas, "METHOD AND APPARATUS FOR INTERROGATION OF BIREFRINGENT FBG SENSORS"
Inventors:
Kringlebotn, Jon Thomas
Abstract:
A method for measurements of the orthogonally polarized minimum and maximum Bragg wavelengths of one of several birefringent fiber Bragg grate FBG sensors, and alternatively a method for eliminating errors in FBG sensor measurements caused by undesired grating birefringence, using an FBG wavelength interrogation apparatus, where the light from a polarized wavelength swept narrowband source ( 1 ) is passed through an electrically controllable polarization controller ( 2 ), operated in either a scanning mode or a tracking mode to find the two orthogonally polarized reflection spectra of the birefringent FBGs ( 6 ) with corresponding minimum and maximum Bragg wavelength .gamma. n x and .gamma. n x , where a low-birefringent reference FBG with known wavelength ( 5 ) and a low-birefringent fixed Fabry-Perod interferometer ( 8 ), generating frequency equidistant peaks are used in combination to provide accurate and readable wavelength measurements.
Assignee:
OPTOPLAN AS
Filing Date:
23 January 2002
Grant Date:
07 September 2004
Patent Classes:
Current U.S. Class:
356477000, 356484000
Current International Class:
G01B0090200000
6.
KRINGLEBOTN, Jon, Thomas, "METHOD AND APPARATUS FOR INTERROGATION OF BIREFRINGENT FBG SENSORS"
Inventors:
KRINGLEBOTN, Jon, Thomas
Abstract:
A method for measurements of the orthogonally polarised minimum and maximum Bragg wavelengths of one or several birefringent fibre Bragg grate FBG sensors, and alternatively a method for eliminating errors in FBG sensor measurements caused by undesired grating birefringence, using an FBG wavelength interrogation apparatus, where the light from a polarised wavelength swept narrowband source (1) is passed through an electrically controllable polarisation controller (2), operated in either a scanning mode or a tracking mode to find the two orthogonally polarised reflection spectra of the birefringent FBGs (6) with corresponding minimum and maximum Bragg wavelength, gBx and gBy, where a low-birefringent reference FBG with known wavelength (5) and a low-birefringent fixed Fabry-Perod interferometer (8), generating frequency equidistant peaks are used in combination to provide accurate and repeatable wavelength measurements.
Assignee:
OPTOPLAN AS
Filing Date:
15 June 2000
Grant Date:
03 April 2002
Patent Classes:
Current International Class:
G01D0053530000
7.
KRINGLEBOTN, Jon, Thomas, "METHOD AND APPARATUS FOR INTERROGATION OF BIREFRINGENT FBG SENSORS"
Inventors:
KRINGLEBOTN, Jon, Thomas
Abstract:
A method for measurements of the orthogonally polarised minimum and maximum Bragg wavelengths of one or several birefringent fibre Bragg grate FBG sensors, and alternatively a method for eliminating errors in FBG sensor measurements caused by undesired grating birefringence, using an FBG wavelength interrogation apparatus, where the light from a polarised wavelength swept narrowband source (1) is passed through an electrically controllable polarisation controller (2), operated in either a scanning mode or a tracking mode to find the two orthogonally polarised reflection spectra of the birefringent FBGs (6) with corresponding minimum and maximum Bragg wavelength, gBx and gBy, where a low-birefringent reference FBG with known wavelength (5) and a low-birefringent fixed Fabry-Perod interferometer (8), generating frequency equidistant peaks are used in combination to provide accurate and repeatable wavelength measurements.
Assignee:
OPTOPLAN AS,
INDIVIDUAL PATENTER,
Filing Date:
15 June 2000
Grant Date:
21 December 2000
Patent Classes:
Current International Class:
G01D0053530000
8.
Bayon, Jean-Fran.cedil; Douay, Marc; Bernage, Pascal; Niay, Pierre, "LINEARLY POLARIZED FIBER OPTIC LASER"
Inventors:
Bayon, Jean-Fran.cedil; Douay, Marc; Bernage, Pascal; Niay, Pierre
Abstract:
A fiber?optic laser comprising a birefringent optic fiber possessing a Bragg grating at each of its ends,. A light source emits a light beam having two modes of polarization in the fiber. The birefringence of the fiber makes it possible to keep the two polarization modes separate. The two Bragg gratings are photo?recorded in the fiber and are made in such a way that their resonance wavelength is matched for one polarization. The wave emitted by the fiber is then polarized linearly along P1. Applications to linearly polarized lasers for optical transmission, instrumentation, spectroscopy, medicine, the detection of chemical species and telemetry.
Assignee:
FRANCE TELECOM
Filing Date:
19 May 1995
Grant Date:
01 October 1996
Patent Classes:
Current U.S. Class:
372006000, 372027000, 372092000, 372102000, 372105000, 385037000, 385096000
Current International Class:
H01S0033000000
9.
Bayon, Jean-François; Bernage, Pascal; Douay, Marc; Niay, Pierre, "Linear-polarization fiber laser"
Inventors:
Bayon, Jean-François; Bernage, Pascal; Douay, Marc; Niay, Pierre
Abstract:
Linearly polarised optical fibre laser for telecommunications, spectroscopy, transmission optics The fibre laser is pumped by an optical wave and is linearly polarised. The laser includes a birefractive optical fibre (F). At each end, this fibre has a photo-inscribed Bragg network (R1,R2). The optical fibre has a very high birefraction, greater than 10-4. The fibre provides two orthogonal modes of polarisation. The two Bragg networks are arranged such that sufficient separation is provided between the resonance peaks of the Bragg wavelengths corresponding to the two modes of polarisation. Preferably, the average Bragg wavelength of the two networks are calculated such that the Bragg wavelengths of the two networks only coincide for the same mode of polarisation.
Assignee:
FRANCE TELECOM
Filing Date:
18 May 1995
Grant Date:
22 November 1995
Patent Classes:
Current International Class:
H01S0030670000
10.
Atkins, Robert M.; Delavaux, Jean-Marc P.; Mizrahi, Victor, "ARTICLE COMPRISING AN OPTICAL WAVEGUIDE LASER"
Inventors:
Atkins, Robert M.; Delavaux, Jean-Marc P.; Mizrahi, Victor
Abstract:
We have discovered that at least some optical waveguide lasers such as Er?doped fiber lasers are subject to excessive output amplitude fluctuations, including severe fluctuations when the laser is subjected to mechanical shock. We have determined that these highly undesirable fluctuations are due to a resonance phenomenon, and that the fluctuations can be at least substantially reduced by means of a feedback loop that makes the amplitude of the output of the pump laser responsive to the amplitude of the output of the waveguide laser. We have also discovered that the operation of a pump laser/waveguide laser combination is frequently improved if an appropriate non?reciprocal element (e.g., an isolator or a tilted wavelength filter) is placed between the two lasers. An exemplary embodiment of the invention comprises the feedback loop as well as the non?reciprocal element.
Assignee:
LUCENT FROM AT&T
Filing Date:
07 February 1994
Grant Date:
03 October 1995
Patent Classes:
Current U.S. Class:
372006000, 372019000, 372703000
Current International Class:
H01S0033000000
11.
Atkins, Robert M.; Delavaux, Jean-Marc P.; Mizrahi, Victor, "ARTICLE COMPRISING AN OPTICAL WAVEGUIDE LASER"
Inventors:
Atkins, Robert M.; Delavaux, Jean-Marc P.; Mizrahi, Victor
Abstract:
We have discovered that at least some optical waveguide lasers such as Er?doped fiber lasers are subject to excessive output amplitude fluctuations, including severe fluctuations when the laser is subjected to mechanical shock. We have determined that these highly undesirable fluctuations are due to a resonance phenomenon, and that the fluctuations can be at least substantially reduced by means of a feedback loop that makes the amplitude of the output of the pump laser responsive to the amplitude of the output of the waveguide laser. We have also discovered that the operation of a pump laser/waveguide laser combination is frequently improved if an appropriate non?reciprocal element (e.g., an isolator or a tilted wavelength filter) is placed between the two lasers. An exemplary embodiment of the invention comprises the feedback loop as well as the non?reciprocal element.
Assignee:
LUCENT FROM AT&T
Filing Date:
23 October 1992
Grant Date:
18 July 1995
Patent Classes:
Current U.S. Class:
372031000, 372006000, 372029020
Current International Class:
H01S0031300000
12.
Atkins, Robert Michael; Delavaux, Jean-Marc Pierre; Mizrahi, Victor, "Article comprising an optical waveguide laser"
Inventors:
Atkins, Robert Michael; Delavaux, Jean-Marc Pierre; Mizrahi, Victor
Abstract:
We have discovered that at least some optical waveguide lasers (51) such as Er-doped fiber lasers are subject to excessive output amplitude fluctuations, including severe fluctuations when the laser is subjected to mechanical shock. We have determined that these highly undesirable fluctuations are due to a resonance phenomenon, and that the fluctuations can be at least substantially reduced by means of a feedback loop (54, 55) that makes the amplitude of the output of the pump laser (57) responsive to the amplitude of the output of the waveguide laser. We have also discovered that the operation of a pump laser/waveguide laser combination is frequently improved if an appropriate non-reciprocal element (e.g., an isolator or a tilted wavelength filter) is placed between the two lasers. An exemplary embodiment of the invention comprises the feedback loop as well as the non-reciprocal element.
Assignee:
AMERICAN TELEPHONE & TELEGRAPH CO
Filing Date:
13 October 1993
Grant Date:
27 April 1994
Patent Classes:
Current International Class:
H01S0030700000, H01S0030600000, H01S0030670000, H01S0030940000, H01S0031000000, H01S0031300000, H01S0031700000
