公开(公告)号：DE69301977D1

公开(公告)日：1996-05-02

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.

公开(公告)号：DE69319692T2

公开(公告)日：1998-12-10

申请号：DE69319692

申请日：1993-10-26

Applicant: LITTON SYSTEMS INC

Inventor： FIDRIC BERNARD G

IPC: G02F1/35 ,  G01C19/72 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/10 ,  H01S3/17

公开(公告)号：AU6021998A

公开(公告)日：1998-08-07

申请号：AU6021998

申请日：1998-01-07

Applicant: LITTON SYSTEMS INC

Inventor： FIDRIC BERNARD G

IPC: H01S3/067 ,  H01S3/094 ,  H01S3/23 ,  H01S3/06

Abstract: An amplifier method and apparatus for use with optic systems utilizing a fiber optic circulator to direct input signals to a splitter that splits the copropagating pump light and input signals into two equal parts for simultaneous introduction into the two opposite ends of the active gain fiber. Half of the pump light and half of the signal are propagating through the active fiber in a clockwise and counterclockwise direction at the same time. This bidirectional propagation results in a more uniform excitation along the entire length of the active fiber, providing uniform stimulation of photon emission at both ends, causing significantly reduced noise and higher gain of the signal. Two half-amplified signals are combined and supplied to the circulator that provides the amplified output signal without any residual pumping light at the input or the output port of the circulator.

公开(公告)号：CA2100828C

公开(公告)日：1998-04-14

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 ,  H01S3/091 ,  G01C19/72

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.

公开(公告)号：DE69115620D1

公开(公告)日：1996-02-01

申请号：DE69115620

申请日：1991-09-19

Applicant: LITTON SYSTEMS INC

Inventor： FIDRIC BERNARD G ,  LIBMAN DAVID F

IPC: H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/0941 ,  H01S3/131

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.

公开(公告)号：DE69809490T2

公开(公告)日：2003-04-03

申请号：DE69809490

申请日：1998-01-19

Applicant: LITTON SYSTEMS INC

Inventor： FIDRIC BERNARD G

IPC: G02B6/293 ,  F21V8/00 ,  G02B6/28 ,  H01L33/00 ,  H01S3/00 ,  H01S3/07

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.