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1.发明专利
公开(公告)号：JPH10284776A
公开(公告)日：1998-10-23
申请号：JP6670198
申请日：1998-03-17
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G
Abstract: PROBLEM TO BE SOLVED: To delete photon excessive noise in a light source of a short coherence such as a wide-band super-fluorescent fiber and a super-light-emitting diode. SOLUTION: Beams from a light source 11 are divided into a plurality of components for a light source signal, whereby photon noise or beat noise is divided, similar to light intensity. Each component passes through separate optical paths 19, 21 having a characteristic time delay which is longer than a coherence time of the light source and is recoupled by a polarizing beam splitting coupler 23 at an end part on an output side prior to detection. As a result, strength of a signal is restored to the original, while a level of a total amount of beat noise is lowered. The optical paths 19, 21 are polarized light- keeping fibers, having a different lengths.
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2.发明专利
公开(公告)号：JPH11145534A
公开(公告)日：1999-05-28
申请号：JP30160697
申请日：1997-11-04
Applicant: LITTON SYSTEMS INC
Inventor： JAMES ROSS STEELE , GOLDNER ERIC LEE , RONALD JAMES MICHAEL , FIDRIC BERNARD G , PATTERSON RALPH A
IPC: G01C19/72 , G02B6/00 , H01S3/06 , H01S3/067 , H01S3/083 , H01S3/0933 , H01S3/23 , H01S5/068 , H01S5/0683
Abstract: PROBLEM TO BE SOLVED: To obtain a fiber laser of superfluorescent wideband by a method, wherein an optical output of an edge-emission type light-emitting diode is amplified by an optical fiber amplifier and used as a light source for a fiber gyro. SOLUTION: An electric source 11 serving as a power supply supplies power to an optical amplifier 12 and a current source 13. The current source 13 sends a drive current or a bias current to the input port 20 of the light amplifier 12 from a wideband light source such as an emission-type light-emitting diode 15, so as to control the intensity of output light signals. The emission-type light-emitting diode 15 is actuated by a bias current of 50 to 80 Ma to generate an average power of 30 to 60 Uw in terms of power spectrum density, having a smooth wideband distribution. The optical amplifier 12 which is used to amplify output light signals 14 is used in combination to enable its output port 18 to output sufficient power. The gain of an optical amplifier is nearly flat on a problematic bandwidth, and a light signal 16 which is power-boosted can be outputted from the output port 18.
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公开(公告)号：DE69319692D1
公开(公告)日：1998-08-20
申请号：DE69319692
申请日：1993-10-26
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G
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公开(公告)号：CA2051308A1
公开(公告)日：1992-03-20
申请号：CA2051308
申请日：1991-09-13
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G , LIBMAN DAVID F
Abstract: A wavelength stabilization apparatus and method for a superfluorescent source comprising a SFS (superfluorescent source) comprising a fiber with a core doped with lazing material. The SFS source produces SFS light with an SFS wavelength when pumped with pump light from a pump light source having a pump light wavelength. An output controller responds to a sample of the SFS light and operates to maximize the power of the sample of SFS light by automatically adjusting the pump light wavelength. The output controller also has a pump power controller responsive to a sample of the pump light from the pump light source for stabilizing the output power of the sample of the pump light with respect to a predetermined reference output power level.
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公开(公告)号：CA1292543C
公开(公告)日：1991-11-26
申请号：CA576477
申请日：1988-09-02
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G
Abstract: RING LASER GYRO FRAME DESIGN RESISTANT TO THERMAL GRADIENT EFFECTS A ring laser gyro is shown which generates two or more laser beams that travel in opposing directions through gas in a ring laser conduit. The laser produces at least two bias components, one due to Langmuir flow and the second due to thermal gradients. The invention uses a symmetrically mounted restriction in the gain regions of the laser conduit to control the flow of the gas in such regions. The non-gain regions of the passages are also enlarged to reduce the effects of thermal gradients on the flow of the gas in the gain regions.
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Patent Agency Ranking
公开(公告)号：DE69115620T2
公开(公告)日：1996-05-15
申请号：DE69115620
申请日：1991-09-19
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G , LIBMAN DAVID F
Abstract: A wavelength stabilization apparatus (10) and method for a superfluorescent source comprising a SFS (superfluorescent source) comprising a fibre with a core doped with lazing material. The SFS source produces SFS light with an SFS wavelength when pumped with pump light from a pump light source (14) having a pump light wavelength. An output controller responds to a sample of the SFS light and operates to maximize the power of the sample of SFS light by automatically adjusting the pump light wavelength. The output controller also has a pump power controller (27) responsive to a sample of the pump light from the pump light source for stabilizing the output power of the sample of the pump light with respect to the predetermined reference output power level.
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公开(公告)号：CA2100828A1
公开(公告)日：1994-02-05
申请号：CA2100828
申请日：1993-07-19
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G , LIBMAN DAVID F
IPC: H01S3/00 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H01S3/13 , H01S3/131 , H05B43/00 , G01C19/72
Abstract: A wavelength stabilization apparatus and method for a superfluorescent source (52) comprising a SFS (superfluorescent source) comprising a fiber with a core doped with lazing material. The SFS source produces SFS light with an SFS wavelength when pumped with pump light from a pump light source (12) having a pump light wavelength. An output controller responds to a sample of the SFS light and operates to maximize the power of the sample of SFS light by automatically adjusting the pump light wavelength. The output controller also has a pump power controller (78) responsive to a sample of the pump light from the pump light source for stabilizing the output power of the sample of the pump light with respect to a predetermined reference output power level.
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公开(公告)号：DE69809490D1
公开(公告)日：2003-01-02
申请号：DE69809490
申请日：1998-01-19
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G
Abstract: A method and various structures are described for reducing excess photon noise in short coherence light sources, such as broadband superfluorescent fiber or superluminescent diodes, for example. The method contemplates splitting the light source signal into a plurality of components, thereby splitting, and reducing, the photon noise or "beat noise" as well as the light intensity. Each component travels in a separate path having a unique time delay which is longer than the coherence time of the light source. The light from each separate path is recombined at an output end, prior to detection, causing the signal to get back to its original intensity, while keeping the total beat noise at a reduced level. The paths may be created using different length polarization maintaining (PM) fibers, different length optical fibers, or multi-mode fibers having several propagation modes propagating at different rates.
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公开(公告)号：CA2219592A1
公开(公告)日：1999-04-29
申请号：CA2219592
申请日：1997-10-29
Applicant: LITTON SYSTEMS INC
Inventor： PATTERSON RALPH A , GOLDNER ERIC LEE , STEELE JAMES ROSS , FIDRIC BERNARD G , MICHAL RONALD JAMES
IPC: G01C19/72 , G02B6/00 , H01S3/06 , H01S3/067 , H01S3/083 , H01S3/0933 , H01S3/23 , H01S5/068 , H01S5/0683 , H04B10/16
Abstract: A power boosted source of broadband optical power comprising a broadband light source, optical fiber amplifier and a relative intensity noise reduction system. The optical fiber amplifier amplifies the power level of the optical input signal to provide a power boosted source of broadband optical power out of an output port. A coupler samples a portion of the broadband optical power out of the output port as a sample portion signal. A detector and transimpedance amplifier detect the optical signal and provide a buffered signal having an instantaneous amplitude that faithfully characterizes the intensity of the sample portion signal. A bandpass amplifier amplifies the buffered signal and provides an output control signal to a light source responsive to a composite bias and control current for providing an output optical signal. The output optical signal is coupled to the input of the optical fiber amplifier to be the optical input signal to the optical fiber amplifier. The output optical signal from the ELED has a substantially constant output intensity level and smooth and bell shaped broad band spectrum with a center optical wavelength within the gain bandwidth of the optical fiber amplifier.
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公开(公告)号：DE69301977T2
公开(公告)日：1996-08-08
申请号：DE69301977
申请日：1993-08-04
Applicant: LITTON SYSTEMS INC
Inventor： FIDRIC BERNARD G , LIBMAN DAVID F
IPC: H01S3/00 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H01S3/13 , H01S3/131 , G01C19/72
Abstract: A wavelength stabilization apparatus and method for a superfluorescent source (52) comprising a SFS (superfluorescent source) comprising a fiber with a core doped with lazing material. The SFS source produces SFS light with an SFS wavelength when pumped with pump light from a pump light source (12) having a pump light wavelength. An output controller responds to a sample of the SFS light and operates to maximize the power of the sample of SFS light by automatically adjusting the pump light wavelength. The output controller also has a pump power controller (78) responsive to a sample of the pump light from the pump light source for stabilizing the output power of the sample of the pump light with respect to a predetermined reference output power level.
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