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    METHOD AND APPARATUS FOR PROVIDING LIGHT HAVING A SELECTED POLARIZATION WITH AN OPTICAL FIBER
    7.
    发明公开
    METHOD AND APPARATUS FOR PROVIDING LIGHT HAVING A SELECTED POLARIZATION WITH AN OPTICAL FIBER 审中-公开
    方法和一种用于提供光选择偏振光纤一

    公开(公告)号：EP1733460A2

    公开(公告)日：2006-12-20

    申请号：EP05712370.5

    申请日：2005-01-31

    申请人： Nufern

    发明人： ABRAMCZYK, Jaroslaw ,  MANYAM, Upendra H. ,  SAMSON, Bryce N. ,  TANKALA, Kanishka

    IPC分类号： H01S3/00

    CPC分类号： H01S3/0675 ,  G02B6/105 ,  H01S3/06712 ,  H01S3/06729 ,  H01S3/08045 ,  H01S3/09415 ,  H01S3/1067 ,  H01S3/1618

    摘要： Optical apparatus (110, 500, 600, 800, 1000) for providing light having a selected linear polarization having a polarization ratio, the apparatus (110, 500, 600, 800, 1000) comprising a length of optical fiber (120, 504, 604, 804, 1001) comprising a rare earth for providing light having a first wavelength responsive to receiving pump light having a second wavelength that is different than said first wavelength, wherein if the length of optical fiber (120, 504, 604, 804, 1004) were placed in a first position between the length of fiber (120, 504, 604, 804, 1004) is substantially linearly oriented (20) the fiber (120, 504, 604, 804, 1004) could propagate at the first wavelength a fundamental mode and a plurality of higher order modes and the apparatus (110, 500, 600, 800, 1000) could provide light having a first polarization ratio for the selected linear polarization and an M2 parameter, and wherein the length of fiber (120, 504, 604, 804, 1004) is positioned in a second position that increases the bend loss of the fiber relative to the first position such that, responsive to the increased bend loss, the apparatus (110, 500, 600, 800, 1000) can provide light having a reduced M2 parameter as well as a second polarization ratio for the selected polarization that is increased relative to the first polarization ratio, the increase being at least 6 dB greater than the first polarization ratio, and wherein when the length of fiber (120, 504, 604, 804, 1004) is in the second position the apparatus (110, 500, 600, 800, 1000) can provide a slope efficiency that is at least 50 % of the ratio of the second wavelength to the first wavelength.

    VARIABLE LIGHT WAVE FUNCTION CIRCUIT AND VARIABLE LIGHT WAVE FUNCTION DEVICE
    8.
    发明公开
    VARIABLE LIGHT WAVE FUNCTION CIRCUIT AND VARIABLE LIGHT WAVE FUNCTION DEVICE 有权
    SCHALTUNG UND EINRICHTUNGFÜRVARIABLE LICHTWELLENFUNKTION

    公开(公告)号：EP1367427A1

    公开(公告)日：2003-12-03

    申请号：EP02702737.4

    申请日：2002-03-05

    申请人： JAPAN SCIENCE AND TECHNOLOGY CORPORATION

    发明人： YAMASHITA, Shinji

    IPC分类号： G02F1/01 ,  H01S3/07

    CPC分类号： G02B6/274 ,  G02B6/024 ,  G02B6/2713 ,  G02B6/2766 ,  G02B6/29302 ,  G02B6/29395 ,  G02F1/0128 ,  G02F1/0134 ,  G02F1/0136 ,  G02F1/178 ,  G02F2203/15 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0407 ,  H01S3/042 ,  H01S3/067 ,  H01S3/06704 ,  H01S3/06712 ,  H01S3/06791 ,  H01S3/08086 ,  H01S3/0941 ,  H01S3/1053 ,  H01S3/106 ,  H01S3/1067 ,  H01S3/1068 ,  H01S3/1608

    摘要： Characteristics are rendered variable and high-functional by using the side-pressure inductive polarization mode coupling of a PMF to thereby change the position and magnitude of a side pressure. An input light is incident via a polarizer (2), and an outgoing light is output via the PMF (1) and another polarizer (3). Light may enter and go out in an opposite way. The PMF (1) has two polarization axes orthogonal to each other, and the polarization axis of the polarizer (2) is coupled so as to agree with one end of the polarization axis of the PMF (1). The polarization axis of the polarizer (3) is coupled so as to agree with one end of the polarization axis of the PMF (1). The PMF (1) induces polarization mode coupling when a polarization light tilted a specified angle with respect to the polarization axis is incident to apply a side pressure to the PMF (1). Characteristics/functions can be changed by changing the position and the magnitude of a side pressure by an application unit (5) so that the length of the PMF (1) of a basic structure can be easily set precisely.

    摘要翻译： 通过使用PMF的侧压感应极化模式耦合从而改变侧压力的位置和幅度，使特性变得可变和高功能。 输入光通过偏振器（2）入射，并且经由PMF（1）和另一偏振器（3）输出出射光。 灯光可能以相反的方式进出。 PMF（1）具有彼此正交的两个偏振轴，并且偏振器（2）的偏振轴被耦合以与PMF（1）的偏振轴的一端一致。 偏振器（3）的偏振轴被耦合以与PMF（1）的偏振轴的一端一致。 当相对于偏振轴倾斜指定角度的偏振光入射时，PMF（1）引起偏振模耦合，以向PMF（1）施加侧压。 可以通过施加单元（5）改变侧压力的位置和大小来改变特性/功能，使得可以容易地精确地设置基本结构的PMF（1）的长度。

    Mode-locked laser stabilizing method and apparatus
    9.
    发明公开
    Mode-locked laser stabilizing method and apparatus 失效
    Verfahren und Vorrichtung zur Stabilisierung eines modengekoppelten Lasers

    公开(公告)号：EP0723320A3

    公开(公告)日：1997-10-22

    申请号：EP96400101.0

    申请日：1996-01-16

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Takara, Hidehiko ,  Kawanishi, Satoki ,  Saruwatari, Masatoshi

    IPC分类号： H01S3/098 ,  H01S3/13

    CPC分类号： H01S3/1109 ,  H01S3/06791 ,  H01S3/106 ,  H01S3/1067 ,  H01S3/139

    摘要： This invention is an improvement of a mode-locked laser stabilizing method and apparatus used with a mode-locked laser apparatus which comprises an optical cavity which consists of an optical modulator which modulates the loss or the phase of light at a fixed frequency, an optical delay line to electrically change the optical path length of the cavity, and an optical amplifier which amplifies a modulated optical pulses. In this method, at least one of the relaxation oscillation frequency components and the harmonic components in the output optical pulses of the mode-locked laser are extracted, and a process of controlling the optical delay line by using the extracted frequency component as an error signal for feedback control and to suppress the error signal below a fixed value.

    摘要翻译： 本发明是对锁模激光装置使用的锁模式激光稳定化方法和装置的改进，其包括光腔，该光腔由调制固定频率的光的损耗或相位的光调制器组成，光学 延迟线以电变化腔的光路长度，以及放大调制光脉冲的光放大器。 在该方法中，提取了锁模激光器的输出光脉冲中的弛豫振荡频率分量和谐波分量中的至少一个，并且通过使用提取的频率分量作为误差信号来控制光学延迟线的处理 用于反馈控制，并将误差信号抑制在固定值以下。