公开(公告)号：US06512628B1

公开(公告)日：2003-01-28

申请号：US09695187

申请日：2000-10-25

Applicant: Takafumi Terahara ,  Takeshi Hoshida

Inventor： Takafumi Terahara ,  Takeshi Hoshida

IPC: H01S300

CPC classification number: H01S3/302 ,  H01S3/1301 ,  H01S3/1302

Abstract: A distributed optical amplifier comprises an optical amplifying medium for distributed optical amplification, light supplying means for supplying a pump light to said optical amplifying medium, a pump light detecting part for detecting optical power of said pump light, adjusting means for adjusting an incident power of the light amplified with said optical amplifying medium, and control means for adjusting incident optical power of said light according to an output of said pump light detecting means. Because of this, the present invention can be controlled with a simplified structure of an optical power of an pump light, and an optical power of light to be amplified. A distributed optical amplifier as such can, for example, be applied in optical transmission systems.

公开(公告)号：US06466364B1

公开(公告)日：2002-10-15

申请号：US10060868

申请日：2002-01-29

Applicant: Benjamin J. Vakoc ,  Michel J. F. Digonnet

Inventor： Benjamin J. Vakoc ,  Michel J. F. Digonnet

IPC: H01S300

CPC classification number: H04B10/294 ,  G02F1/3519 ,  H01S3/06754 ,  H01S3/1302 ,  H01S2301/04 ,  H01S2301/06 ,  H04B10/2935

Abstract: An apparatus and a method provide gain flattening in communications systems wherein a large number of optical signals at different wavelengths must be amplified while maintaining signal power within an acceptable range. Because of differences in gain of typical optical amplifiers as a function of wavelength and input power, the signals at different wavelengths are not amplified by the same amounts. Thus, when amplified multiple times, certain signals tend to become severely attenuated to the point of being no longer useable. The present gain flattening apparatus and method cause signals having higher gain-power products to be attenuated by a greater amount in response to Kerr-induced phase shifting such that after multiple stages of amplification, all the signal powers converge toward a small range of acceptable output powers. The apparatus provides amplification, multiple times, of a series of signals with a plurality of wavelengths covering a very wide spectral range, while maintaining the power of all the signals within a small range. The spread of this signal power range is robust against changes in the signal power, against changes in the number of signals, and, to some degree, against changes in the amplifier's pump power. The apparatus design is also robust against manufacturing changes in the parameters of the apparatus' components. The apparatus and invention are preferably implemented as multiple nonlinear Sagnac amplifiers having erbium-doped fiber amplifiers positioned asymmetrically in an interferometer loop.

公开(公告)号：US20020024706A1

公开(公告)日：2002-02-28

申请号：US09848905

申请日：2001-05-04

Inventor： Fausto Meli

IPC: H04B010/00 ,  H04B010/12

CPC classification number: H04B10/296 ,  H01S3/06754 ,  H01S3/094023 ,  H01S3/1302 ,  H04J14/0221

Abstract: Optical telecommunications system, comprising: a station (1) for transmitting optical signals, comprising a transmission signal generator (2), capable of generating at least two signals at wavelengths lying within a band of predetermined width, and a multiplexer (3) of the optical signals; a station (8) for receiving the optical signals; and an optical fibre line connecting the said multiplexer of the transmission station to the receiving station. The optical fibre line includes at least one optical amplifier (7) comprising at least one fibre (12) doped with a rare earth, at least one source of pumping radiation (14) for the said doped fibre, and a gain stabilization circuit. The gain stabilization circuit comprises: a separator of the transmission signals from the spontaneous emission of the amplifier, connected after the doped fibre and capable of sending the transmission signals to the output of the amplifier and the spontaneous emission to a further output, and a loop circuit for the re-circulation of the said spontaneous emission collected from the said further output and re-injected before the said doped fibre of the amplifier.

Abstract translation: 光通信系统，包括：用于发送光信号的站（1），包括传输信号发生器（2），能够产生位于预定宽度的频带内的波长的至少两个信号;以及多路复用器（3） 光信号; 用于接收光信号的站（8）; 以及将所述发送站的所述复用器连接到所述接收站的光纤线路。 光纤线路包括至少一个光放大器（7），其包括掺杂有稀土的至少一个光纤（12），用于所述掺杂光纤的至少一个泵浦辐射源（14）和增益稳定电路。 增益稳定电路包括：来自放大器的自发发射的发射信号的分离器，连接在掺杂光纤之后，并且能够将发射信号发送到放大器的输出并且将自发发射到另一输出，以及环路 电路，用于从所述另一输出端收集的所述自发发射的再循环，并在放大器的所述掺杂光纤之前重新注入。

公开(公告)号：US06307667B1

公开(公告)日：2001-10-23

申请号：US09453376

申请日：1999-12-02

Applicant: Anhui Liang

Inventor： Anhui Liang

IPC: H01S300

CPC classification number: H01S3/1302 ,  H01S3/06754 ,  H01S3/1305 ,  H01S3/1603

Abstract: A gain-clamped, optical amplifier includes a rare-earth doped fiber and a source of pump energy coupled to the rare-earth doped fiber. The doped fiber serves as a gain medium that is optically pumped by the pump source. A wavelength-selective optical feedback loop is coupled between input and output ports of the rare-earth doped fiber. The feedback loop supports a compensating lasing signal, which is a pulsed signal located at a wavelength different from a signal wavelength.

Abstract translation: 增益钳位的光放大器包括稀土掺杂光纤和耦合到稀土掺杂光纤的泵浦能量源。 掺杂光纤用作由泵浦光泵浦的增益介质。 波长选择性光反馈回路耦合在稀土掺杂光纤的输入和输出端口之间。 反馈回路支持补偿激光信号，其是位于与信号波长不同的波长的脉冲信号。

公开(公告)号：US6008932A

公开(公告)日：1999-12-28

申请号：US946469

申请日：1997-10-07

Applicant: Gengxian Luo ,  Atul K. Srivastava ,  James W. Sulhoff ,  Yan Sun ,  John L. Zyskind

Inventor： Gengxian Luo ,  Atul K. Srivastava ,  James W. Sulhoff ,  Yan Sun ,  John L. Zyskind

IPC: H01S3/067 ,  H01S3/13 ,  H01S3/131 ,  H01S3/16 ,  H01S3/30 ,  G02B6/26

CPC classification number: H01S3/1302 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/09415 ,  H01S3/1608

Abstract: An Erbium doped fiber amplifier (EDFA) is placed in a laser cavity to clamp the gain of the amplifier. The laser cavity is preferably formed to minimize the effects of relaxation oscillations and of spectral hole burning. In a preferred embodiment, the laser cavity supports a lasing wavelength which makes the saturation energy at the laser wavelength less than that at the signal wavelengths. In an erbium doped fiber implementation, the laser wavelength is shorter than that of the signal wavelengths and is separated from them by no more than approximately 75% of the width of the spectral hole. The compounding of relaxation oscillations may be substantially eliminated by varying the length of the fiber within each laser cavity within a system to change the photon round-trip time within each cavity.

公开(公告)号：US5991068A

公开(公告)日：1999-11-23

申请号：US693049

申请日：1996-10-21

Applicant: Jennifer Massicott ,  Richard Wyatt

Inventor： Jennifer Massicott ,  Richard Wyatt

IPC: H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H01S3/16

CPC classification number: H01S3/1302 ,  H01S2301/04 ,  H01S2301/06 ,  H01S3/0675 ,  H01S3/131 ,  H01S3/1608 ,  H01S3/1613

Abstract: In a gain-controlled erbium-doped optical amplifier, gain control is achieved by clamping the gain of a laser cavity to be equal to the overall cavity loss and by fixing the resonant wavelength of the amplifier to be at a first wavelength. When an optical signal to be amplified having a second wavelength different from the first wavelength passes through the amplifier the gain experienced by the signal depends entirely on the gain of the cavity, and not on the intensity of the signal. If the first wavelength is arranged to be at the peak of the sum of the absorption and emission cross sections of erbium, the amplifier exhibits minimum sensitivity to ambient changes in temperature.

Abstract translation: PCT No.PCT / GB95 / 00346 Sec。 371日期1996年10月21日 102（e）日期1996年10月21日PCT提交1995年2月20日PCT公布。 第WO95 / 22847号公报 日期1995年8月24日在增益控制掺铒光放大器中，增益控制是通过将激光腔的增益钳位为等于整个腔损耗来实现的，并且通过将放大器的谐振波长固定为第一 波长。 当具有不同于第一波长的第二波长的要被放大的光信号通过放大器时，信号所经历的增益完全取决于空腔的增益，而不依赖于信号的强度。 如果第一波长被布置成铒的吸收和发射截面之和的峰值，放大器对环境温度变化表现出最小的灵敏度。

公开(公告)号：US5434701A

公开(公告)日：1995-07-18

申请号：US168291

申请日：1993-12-17

Applicant: Mohammad T. Fatehi ,  Clinton R. Giles

Inventor： Mohammad T. Fatehi ,  Clinton R. Giles

IPC: G02F1/35 ,  G02F3/00 ,  H01S3/06 ,  H01S3/10 ,  H01S3/13 ,  H04B10/29 ,  G02F1/39

CPC classification number: H04B10/29 ,  G02F3/00 ,  H01S3/1302

Abstract: An all-optical inverter device is achieved by employing an optical amplifier having a optical filter positioned in a feedback loop arranged so that an output signal of the optical amplifier having a first characteristic wavelength is inversely related to an input signal to the optical amplifier having a second characteristic wavelength.

Abstract translation: 全光逆变器装置通过采用具有位于反馈回路中的光学滤波器的光放大器来实现，该反馈环路布置成使得具有第一特征波长的光放大器的输出信号与具有第一特征波长的光放大器的输入信号成反比 第二特征波长。