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公开(公告)号：US5179461A
公开(公告)日：1993-01-12
申请号：US598547
申请日：1990-10-16
IPC分类号： H04B10/158
CPC分类号： H04B10/6973 , H03F1/565
摘要： This optical receiver is capable of receiving broadband R-F modulated signals transmitted over fiber-optic cable. The receiver comprises a photodiode impedance matched to the input of an low noise, low distortion amplifier by an impedance matching transformer. A passive tuning network is placed between the photodiode and the transformer to improve the high frequency performance of the receiver. Distortion of the optical receiver is further reduced by cancelling even power distortion products from out of phase signals generated by the photodiode.
摘要翻译： 该光接收机能够接收通过光纤电缆传输的宽带R-F调制信号。 接收机包括通过阻抗匹配变压器与低噪声，低失真放大器的输入匹配的光电二极管阻抗。 被动调谐网络放置在光电二极管和变压器之间，以提高接收机的高频性能。 通过从由光电二极管产生的异相信号中消除均匀的功率失真产物，进一步降低了光接收机的失真。
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公开(公告)号：US5430569A
公开(公告)日：1995-07-04
申请号：US887533
申请日：1992-05-22
申请人： Henry A. Blauvelt , John S. Frame , Amnon Yariv , David B. Huff
发明人： Henry A. Blauvelt , John S. Frame , Amnon Yariv , David B. Huff
CPC分类号： H04B10/2507
摘要： Noise and distortion due to scattering and reflection in a fiber-optic communications system are suppressed by modulating the optical frequency of (chirping) a laser light source to broaden the spectrum of the laser light output. The broader spectrum spreads the noise produced by an unchirped source over a broader band. A noise and distortion suppression system includes a chirp signal generator coupled to the signal path of an RF input signal carrying information to modulate the laser optical output. In some cases, the frequency of the chirp generating signal may result in second-order intermodulation products falling within the information band. In such cases, the RF input signal is predistorted to offset the expected distortion products.
摘要翻译： 通过调制激光光源的（啁啾）的光频率来扩大激光输出的光谱，可抑制由于光纤通信系统中的散射和反射引起的噪声和失真。 更广泛的频谱在更宽的频带上扩展了由无源信号产生的噪声。 噪声和失真抑制系统包括耦合到携带信息的RF输入信号的信号路径的啁啾信号发生器，以调制激光光输出。 在某些情况下，线性调频脉冲发生信号的频率可能导致落在信息频带内的二阶互调产物。 在这种情况下，RF输入信号被预失真以抵消预期的失真产物。
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公开(公告)号：US5453868A
公开(公告)日：1995-09-26
申请号：US284369
申请日：1994-08-02
申请人： Henry A. Blauvelt , John S. Frame , Amnon Yariv , David B. Huff
发明人： Henry A. Blauvelt , John S. Frame , Amnon Yariv , David B. Huff
CPC分类号： H04B10/2507
摘要： Noise and distortion due to scattering and reflection in a fiber-optic communications system are suppressed by modulating the optical frequency of (chirping) a laser light source to broaden the spectrum of the laser light output. The broader spectrum spreads the noise produced by an unchirped source over a broader band. A noise and distortion suppression system includes a chirp signal generator coupled to the signal path of an RF input signal carrying information to modulate the laser optical output. In some cases, the frequency of the chirp generating signal may result in second-order intermodulation products falling within the information band. In such cases, the RF input signal is predistorted to offset the expected distortion products.
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