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1. 发明专利

JPH10135550A FIBER OPTICAL AMPLIFIER SYSTEM AND OPTICAL SIGNAL AMPLIFYING METHOD 失效
公开(公告)号：JPH10135550A
公开(公告)日：1998-05-22
申请号：JP20474497
申请日：1997-07-30
申请人： UNIV LELAND STANFORD JUNIOR
发明人： SHAW HERBERT J , DIGONNET MICHEL J F
IPC分类号： G02B6/00 , G02B6/26 , G02B6/28 , G02F1/17 , G02F1/313 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/091 , H01S3/0933 , H01S3/094 , H01S3/10 , H01S3/23 , H03F3/08 , H03F3/18 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide a fiber optical amplifier system whose structure is highly simplified. SOLUTION: This fiber optical amplifier system is provided with a lasing fiber, a pump light source 42 with which the lasing fiber is pumped, and a light coupler having the coupling efficiency which depends on wavelength. This light coupler contains an optical fiber port for signal which transmits the signal to be amplified, an optical fiber port for pump light which transmits the pump light, and an optical fiber port for signal and pump light. This optical fiber port for signal and pump light, is optically coupled to one end of the lasing fiber. The signal to be amplified is transmitted between the above-mentioned optical coupler and the lasing fiber, and an inversion distribution is generated in a lasing substance by transmitting the pump light to the lasing substance contained in the lasing fiber. As a result, signal is amplified by induction radiation when the signal passes through the lasing fiber.

2. 发明专利

JPH10239069A OPTICAL FIBER ROTATION SENSOR 失效
公开(公告)号：JPH10239069A
公开(公告)日：1998-09-11
申请号：JP30888497
申请日：1997-11-11
申请人： UNIV LELAND STANFORD JUNIOR
发明人： SHAW HERBERT J , LEFEVRE HERVE C , BERGH RALPH A
IPC分类号： G01P9/00 , G01B9/02 , G01C19/64 , G01C19/72 , G01P3/36
摘要： PROBLEM TO BE SOLVED: To eliminate the influence of amplitude modulation by modulating the phase of light wave, separated and propagated in an optical fiber strand, in reverse directions to a detecting loop, with specific frequency constant in phase difference. SOLUTION: Light from a light source 10 is propagated to a detecting loop 14 through an optical fiber strand 12 with fiber directional couplers 26, 34, a polarizer 32, a photo detector 30, a phase modulator 38, and the like in a path. Input light is separated into two waves propagated in reverse directions by the couplers 26, 34 and coupled again upon crossing the loop 14. The detector 30 receives an optical signal polarized in the same way as the loop input light by the polarizer 32 and outputs a signal proportional to the rotating speed of the loop 14. The modulator 38 is provided with a PZT cylinder so as to modulate the phase of a pair of light waves, passing through the loop 14, with specific modulation frequency to make phase difference 180 deg., in response to a modulation signal from a generator 40. With this constitution, only the reference frequency of an optical output signal is detected, and influence caused by amplitude modulation is eliminated.

3. 发明专利

JP2000004058A FIBER OPTICAL AMPLIFIER AND AMPLIFYING METHOD OF OPTICAL SIGNAL 失效
公开(公告)号：JP2000004058A
公开(公告)日：2000-01-07
申请号：JP16180899
申请日：1999-06-09
申请人： UNIV LELAND STANFORD JUNIOR
发明人： SHAW HERBERT J , DIGONNET MICHEL J F
IPC分类号： G02B6/00 , G02B6/26 , G02B6/28 , G02F1/17 , G02F1/313 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/091 , H01S3/0933 , H01S3/094 , H01S3/10 , H01S3/23 , H03F3/08 , H03F3/18 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To inject a signal using an identical multiplication coupler by pumping a lasing material and causing an inversion distribution in a doped material so that a signal is amplified by induction radiation in passing through the doped material thereby realizing symmetrical bi-directional amplification. SOLUTION: A pumping illumination source 42 is coupled with the fiber 12a of a coupler and provides the port A of a multiplication coupler with pumping illumination. A signal to be amplified is coupled with one end of a fiber 12b at port C of the coupler. Pumping illumination from the light source 42 and the signal to be amplified are coupled at port D of the coupler through amplifying function of the coupler. The pair of signal wavelengths are delivered to an ND:YAG crystal 44 to be coupled with the fiber 12b. A signal input at port C is amplified in the ND:YAG crystal 44 and coupled with an optical fiber 46 before being transmitted through an optical fiber system.

4. 发明专利

JPH10144981A FIBER OPTICAL AMPLIFIER SYSTEM AND METHOD FOR AMPLIFYING LIGHT SIGNAL 失效
公开(公告)号：JPH10144981A
公开(公告)日：1998-05-29
申请号：JP20474397
申请日：1997-07-30
申请人： UNIV LELAND STANFORD JUNIOR
发明人： SHAW HERBERT J , DIGONNET MICHEL J F
IPC分类号： G02B6/00 , G02B6/26 , G02B6/28 , G02F1/17 , G02F1/313 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/091 , H01S3/0933 , H01S3/094 , H01S3/10 , H01S3/23 , H03F3/08 , H03F3/18 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide a fiber optical amplifier system whose structure is highly simplified. SOLUTION: A fiber optical amplifier system has a lasing fiber 44, a pump light source 42 for pumping the lasing fiber 44, and photocouplers 10a and 10b with a coupling efficiency, depending on the wavelength. The photocouplers 10a and 10b include an optical fiber port for signal that transmits a signal to be amplified, an optical fiber port for pump light that transmits pump light, and an optical fiber port commonly for signal and pump light. The optical fiber port used commonly for the signal and pump signal is coupled optically to one terminal of the lasing fiber 44, transmits a signal to be amplified between the photocouplers 10a and 10b and the lasing fiber 44. At the same time, the port transmits pump light to a lasing substance in the lasing fiber 44 and causes an population inversion in the lasing substance, thus amplifying a signal owing to induced radiation when it passes through the lasing fiber 44.

5. 发明授权

US4773759B1 Interferometer with Kerr effect compensation 失效
标题翻译：干涉仪具有克尔效应补偿
公开(公告)号：US4773759B1
公开(公告)日：1996-08-06
申请号：US4980587
申请日：1987-05-12
申请人： UNIV LELAND STANFORD JUNIOR
发明人： BERGH RALPH A , CULSHAW BRIAN , LEFEVRE HERVE C , SHAW HERBERT J , CHAPIN CUTLER C
IPC分类号： G01B9/02 , G01C19/72
CPC分类号： G01C19/72

6. 发明授权

US4859016B1 Fiber optic amplifier 失效
标题翻译：光纤放大器
公开(公告)号：US4859016B1
公开(公告)日：2000-11-07
申请号：US13787087
申请日：1987-12-22
申请人： UNIV LELAND STANFORD JUNIOR
发明人： SHAW HERBERT J , DIGONNET MICHEL J F
IPC分类号： H01S3/067 , H01S3/0933 , H01S3/094 , H04B10/17 , H04J14/02 , G02B6/26
CPC分类号： H04B10/2912 , H01S3/06787 , H01S3/0933 , H01S3/094003 , H01S3/094011 , H04B10/291 , H04J14/02

7. 发明专利

NO930875A 未知
公开(公告)号：NO930875A
公开(公告)日：1993-10-01
申请号：NO930875
申请日：1993-03-10
申请人： UNIV LELAND STANFORD JUNIOR
发明人： PANTELL RICHARD H , SADOWSKI ROBERT W , DIGONNET MICHEL J F , SHAW HERBERT J
IPC分类号： G02F1/35 , G02F1/365 , H01S3/067 , G02F1/295 , G02B6/42
CPC分类号： G02F1/365 , G02F1/3521 , H01S3/067 , H01S3/06783

8. 发明专利

CA1314741C DYNAMIC COUPLER USING TWO-MODE OPTICAL WAVEGUIDES 未知
公开(公告)号：CA1314741C
公开(公告)日：1993-03-23
申请号：CA559311
申请日：1988-02-19
申请人： UNIV LELAND STANFORD JUNIOR
发明人： KIM BYOUNG Y , SHAW HERBERT J
IPC分类号： G02B6/14 , G02B6/34 , G02F1/35 , H04B10/2569 , G02B6/26
摘要： DYNAMIC COUPLER USING TWO-MODE OPTICAL WAVEGUIDES An optical mode coupling apparatus includes an optical waveguide that couples an optical signal from one propagation mode of the waveguide to a second propagation mode of the waveguide. The optical signal propagating in the waveguide has a beat length, and the coupling apparatus includes a source of perturbational light signal that propagates in the waveguide in two spatial propagation modes having different propagation constants so as to have a perturbational signal beat length. The perturbational signal has an intensity distribution in the waveguide that causes periodic perturbations in the refractive indices of the waveguide in accordance with the perturbational signal beat length. The periodic perturbations of the refractive indices of the optical waveguide cause cumulative coupling of the optical signal from one propagation mode to another propagation mode. The perturbational light signal can be selectively enabled and disabled to selectively enable and disable coupling of the optical signal between the propagation modes. UA3-985:bb/cc4 022087

9. 发明专利

CA1313404C BROADBAND OPTICAL FIBER LASER 未知
公开(公告)号：CA1313404C
公开(公告)日：1993-02-02
申请号：CA595170
申请日：1989-03-30
申请人： UNIV LELAND STANFORD JUNIOR
发明人： LIU KAREN , KIM BYOUNG Y , DIGONNET MICHEL J F , FESLER KENNETH A , SHAW HERBERT J
IPC分类号： G01B9/02 , G01C19/72 , H01S3/06 , H01S3/067 , H01S3/083 , H01S3/094 , H01S3/30
摘要： STANF.8C2 PATENT BROADBAND OPTICAL FIBER LASER An optical fiber laser includes a single-mode optical fiber doped with a lasing material such as Neodymium. The optical fiber is pumped with a pump optical signal having a pump wavelength selected to cause spontaneous emission of an optical signal at a second wavelength different from the pump wavelength. The optical fiber is formed into a laser cavity such as by including a suitable reflector at each of the two ends of a suitable length of the optical fiber so that the emitted optical signal oscillates therein. One of the reflectors has a reflectivity at the wavelength of the emitted light so that most (e.g., approximately 95%) of the emitted light is reflected back into the laser cavity and a smaller portion (e.g., approximately 5%) is transmitted through the mirror as a laser output signal. Alternatively, the optical fiber can be formed into a ring laser structure using an optical coupler that couples a substantial portion (e.g., approximately 95%) of the emitted light back into the ring for recirculation therein and provides a smaller portion of the emitted light (e.g., approximately 5%) as a laser output signal. The wavelength of the pump optical signal is selected to be outside the pump variable tuning range of the Neodymium doped optical fiber (i.e., the range of pump wavelengths which stimulate emitted wavelengths having a average wavelengths with a generally one-to-one correspondence to the pump wavelength). Pumping with a pump signal outside the pump variable tuning ranges causes the emitted light to have a broad spectral envelope of longitudinal modes having emission wavelengths corresponding to substantially all the pump variable tuning range. Thus, by pumping the optical fiber with a single pump wavelength, a broadband laser output signal is generated.

10. 发明专利

DE3782393D1 未知
公开(公告)号：DE3782393D1
公开(公告)日：1992-12-03
申请号：DE3782393
申请日：1987-09-11
申请人： UNIV LELAND STANFORD JUNIOR
发明人： KIM BYOUNG YOON , CARRARA SIDNEY L A , SHAW HERBERT J
IPC分类号： G02B6/00 , G01C19/64 , G01C19/72 , G01J9/02
摘要： A fiber optic rotation sensor using birefringent optical fiber (11) includes an uncorrelating element (200, 202), an equalizing element (204) and a polarizer (220) in the common input and output fiber portions (13) of the sensor to reduce or eliminate the intensity type phase errors caused by interference between lightwaves originally in the same polarization mode on entry to the sensor loop (16) that cross couple into another polarization mode. In the preferred embodiment, the uncorrelating element (200, 202) comprises a birefringence modulator (202) and a length (200) of birefringent fiber. The equalizing element (204) comprises a birefringent fiber (11, 13) having a splice (204) at which the axes of birefringence of the spliced portions (206, 208) of the fiber (11, 13) are positioned at 45 DEG relative to each other. The preferred embodiment also advantageously includes a birefringence modulator (60) that introduces a time-varying birefringence into the optical fiber (11) to introduce a deterministic phase error that reduces or eliminates amplitude type phase error caused by coherent interference between field components of light that are orthogonally polarized at the input of the sensor loop (16) and that couple to the same polarization mode within the loop (16).

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