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78 条记录 (耗时 0.011 秒)

    Optical communication system with Raman amplification
    74.
    发明公开
    Optical communication system with Raman amplification 有权
    OptischesÜbertragungssystemmit Raman-Verstärkung

    公开(公告)号：EP1130704A2

    公开(公告)日：2001-09-05

    申请号：EP01301417.0

    申请日：2001-02-19

    申请人： LUCENT TECHNOLOGIES INC.

    发明人： Ackerman, David Alan ,  Bacher, Kenneth L. ,  Dautremont-Smith, William Crossley ,  Du, Mei ,  Rottwitt, Karsten ,  Stentz, Andrew John ,  Strasser, Thomas Andrew ,  Zhang, Liming

    IPC分类号： H01S3/30 ,  H04B10/17

    CPC分类号： H04B10/2916 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/09408 ,  H01S3/094096 ,  H01S3/302 ,  H01S5/1096 ,  H01S2301/03

    摘要： A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.

    摘要翻译： 光纤拉曼放大器被配置为使用共同传播的拉曼泵浦源，其可以在各种系统配置（例如，双向通信系统）中是有益的。 通过仔细配置泵浦源特性，可以在共同传播装置中实现足够的光学增益，其特征包括：（1）使用至少50mW的光泵功率，（2）在泵内具有相对较大的光谱带宽 （抑制SBS）; 和（3）每个泵浦激光器的所有纵向泵浦模式之间的频率差异至少被泵浦激光器频率和信号频率之间的离散频率分开，并且不同泵浦激光器之间的所有强烈纵向模式至少被分离 通信系统的电气带宽。

    High power lightwave transmitter using highly saturated amplifier for residual AM suppression
    76.
    发明公开
    High power lightwave transmitter using highly saturated amplifier for residual AM suppression 失效
    用高饱和放大器的光的高功率发射器，用于抑制残留振幅调制

    公开(公告)号：EP0720313A1

    公开(公告)日：1996-07-03

    申请号：EP95308961.2

    申请日：1995-12-11

    申请人： AT&T Corp.

    发明人： Eskildsen, Lars E. ,  Hansen, Per B.

    IPC分类号： H04B10/18

    CPC分类号： H04B10/2537 ,  H01S3/06754 ,  H01S2301/02 ,  H01S2301/03

    摘要： Stimulated Brillouin scattering has been effectively suppressed and the effect of residual amplitude modulation has been mitigated in a dithered optical transmitter (11) by injecting the dithered optical signal into an optical device, such as a highly saturated amplifier (15), whose small-signal intensity response at the dither frequency dampens the residual amplitude modulation thereby decreasing the eye closure (alternatively, increasing the eye pattern opening). The optical device (15)(e.g., the highly saturated amplifier) exhibits a low frequency cutoff (-3dB) at a frequency greater than or equal to the inverse of the round trip time for a fiber span with the effective optical transmission length into which the optical signal power is launched. The dither rate is generally in the neighborhood of or below the low cutoff frequency.

    摘要翻译： 受激布里渊散射是由抖动光信号注入到在光学装置有效地抑制和残留振幅调制的效果被缓和在抖动的光发射机，检查作为高饱和放大器，谁的小信号强度响应在抖动频率衰减的 残余幅度调制，从而降低了眼扣或增加眼图案的开口。 的光学装置，E.G. 高度饱和放大器，在大于或等于的往返时间的倒数为到被推出的光信号功率与有效光学传输长度的纤维跨度的频率处出现低频截止（-3 dB）的 ， 抖动率在或低于低截止频率附近的基因的反弹。

    Reduction of stimulated brillouin scattering in a fiber optic transmission system
    78.
    发明公开
    Reduction of stimulated brillouin scattering in a fiber optic transmission system 失效
    激励刺激在布里渊 - 圣日耳曼文化中的激励。

    公开(公告)号：EP0595536A1

    公开(公告)日：1994-05-04

    申请号：EP93308335.4

    申请日：1993-10-20

    申请人： AT&T Corp.

    发明人： Fishman, Daniel A. ,  Nagel, Jonathan A. ,  Park, Yong-Kwan

    IPC分类号： H04B10/18

    CPC分类号： H04B10/2537 ,  H01S2301/02 ,  H01S2301/03

    摘要： A technique for reducing the power threshold at which stimulated brillouin scattering ("SBS") occurs within an optical fiber by directly modulating a conventional laser generating an optical signal propagated along that fiber. The modulation is accomplished by employing an alternating waveform to induce a dither upon the laser output. The specific frequency of the alternating waveform is chosen to be very much lower than the low frequency cut-off of any receiver coupled to the optical fiber, but sufficiently high enough to efficiently suppress the Brillouin gain. This dithering causes the laser to be frequency modulated, thereby broadening the effective linewidth of the laser output and increasing the SBS power threshold.

    摘要翻译： 通过直接调制产生沿该光纤传播的光信号的常规激光器，降低在光纤内发生受激布里渊散射（“SBS”）的功率阈值的技术。 通过采用交替波形来在激光输出上引起抖动来实现调制。 交替波形的特定频率被选择为非常低于耦合到光纤的任何接收机的低频截止，但足够高以有效地抑制布里渊增益。 这种抖动使得激光器被频率调制，从而拓宽了激光输出的有效线宽并增加了SBS功率阈值。