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公开(公告)号：US5040033A
公开(公告)日：1991-08-13
申请号：US371473
申请日：1989-06-26
CPC分类号： H01S5/0264 , H01S5/50
摘要： Briefly, in the invention a photodetector and an optical amplifier are integrated in the same semiconductor chip. The optical amplifier and the photodetector are positioned side-by-side on the same chip. A portion of the electromagnetic energy carried in the evanescent tail of the optical mode is detected by the photodetector for monitoring the average output power of the optical amplifier. Current confinement and lateral index guiding can be provided by Fe or Ti doped semi-insulating layers of InP. The side-by-side arrangement enables the detector to monitor the output power of the optical amplifier without degrading the output power of the optical amplifier.
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公开(公告)号：US5029297A
公开(公告)日：1991-07-02
申请号：US421217
申请日：1989-10-13
IPC分类号： G01J1/02 , G02B5/18 , G02B6/12 , G02B6/30 , G02B6/34 , G02B6/42 , G02F1/35 , H01L31/10 , H01L33/00 , H01S5/00 , H01S5/026 , H01S5/50
CPC分类号： H01S5/50 , G02B6/12004 , G02B6/34 , G02B6/42 , H01S5/0264
摘要： The device here disclosed comprises an optical amplifier coupled to direct optical energy into a passive waveguide for transmission through the waveguide to its other end. A photodetector, positioned relative to the passive waveguide, detects the presence of optical energy in the passive waveguide. The photodetector in the structure illustrated is positioned downstream from the optical amplifier and spatially positioned with respect to the optical amplifier to receive optical energy only from the waveguide. The photodetector does not receive optical energy directly from the optical amplifier. A small fraction of the optical energy carried by the passive waveguide is received and detected by the photodetector.
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公开(公告)号：US4877952A
公开(公告)日：1989-10-31
申请号：US255292
申请日：1988-10-11
IPC分类号： G02B6/122 , G02B6/12 , G02F1/313 , G02F1/35 , G02F3/00 , G02F3/02 , G11C13/04 , G11C21/00 , H01S3/10
摘要： This invention is an optical memory device in which data is written, stored and read out in optical form without any conversion to electronics. The functions performed such as readout, reset and the like can be via electronic means, optical means, or a combination of both. The inherent bistability/hysteresis which is required for the memory function is obtained with a laser structure which includes a saturable absorber and, as a portion of the cavity, a waveguide.
摘要翻译： 本发明是一种光学存储器件，其中以光学形式写入，存储和读出数据，而无需转换成电子器件。 诸如读出，复位等执行的功能可以通过电子装置，光学装置或两者的组合。 利用包括可饱和吸收体和作为腔的一部分的波导的激光结构，获得记忆功能所需的固有双稳态/滞后。
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公开(公告)号：US4918396A
公开(公告)日：1990-04-17
申请号：US333218
申请日：1989-04-05
CPC分类号： H04B10/2931 , H01S5/0014 , H01S5/50 , H04B10/2914 , H01S5/0028 , H01S5/06808
摘要： Briefly, in this invention, the output optical power of an optical amplifier is determined by detecting and measuring the electrical signal induced on the bias lead of the optical amplifier when an optical data stream with additional amplitude modulation passes through the optical amplifier. This additional amplitude modulation can consist of a base band signal, a pilot tone and/or a sub-carrier which is amplitude modulated, frequency modulated or phase modulated. The modulation depth and bandwidth of the additional amplitude modulation should be kept small enough that the data stream is not excessively affected. The induced electrical signal provides a measurement of the optical power at the output facet of the optical amplifier. Control of the output power of the optical amplifier is effected by controlling the bias current applied to the bias lead of the optical amplifier. Thus, the output power of an optical amplifier can be monitored and telemetry signals can be received without interception of the data stream. The additional amplitude modulation of the data stream can be effected at the transmitter or by modulation of the bias current of an optical amplifier for transmission downstream. With this invention, no optical power is lost when the output power generated by an optical amplifier is monitored and modulation of the data stream can be effected without the use of additional optical components.
摘要翻译： 简而言之，在本发明中，当具有附加幅度调制的光数据流通过光放大器时，通过检测和测量在光放大器的偏置引线上感应的电信号来确定光放大器的输出光功率。 该附加幅度调制可以由基带信号，导频音和/或被调幅，调频或相位调制的子载波组成。 附加幅度调制的调制深度和带宽应保持足够小，使得数据流不会受到过度影响。 感应电信号提供了在光放大器的输出端处的光功率的测量。 通过控制施加到光放大器的偏置引线的偏置电流来实现光放大器的输出功率的控制。 因此，可以监视光放大器的输出功率，并且可以接收遥测信号而不拦截数据流。 数据流的附加幅度调制可以在发射机处进行，也可以通过调制用于下行传输的光放大器的偏置电流来实现。 利用本发明，当监视由光放大器产生的输出功率并且可以在不使用附加的光学部件的情况下实现数据流的调制时，不会损失光功率。
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