Abstract: Apparatus for driving an optical system modulator to modulate data signals onto a light wave of the optical system. The modulator driver apparatus has a limited amplifier for receiving multiplexed low speed binary data signals and for generating amplified and limited frequency output signals representative of the received multiplexed binary data signals. A differential amplifier connected to an output of the limited amplifier precisely controls the amplitude and generates a low level of over and undershoot of output signals over a wide range of the limited amplifier output signals and has an output connected to central processor unit controlled linear amplifier means for generating gain controlled high fidelity output signals characterized with low over and undershoot and a high extinction ratio for driving the modulator.

Abstract: Apparatus for driving an optical system modulator to modulate data signals onto a light wave of the optical system. The modulator driver apparatus has a limited amplifier for receiving multiplexed low speed binary data signals and for generating amplified and limited frequency output signals representative of the received multiplexed binary data signals. A differential amplifier connected to an output of the limited amplifier precisely controls the amplitude and generates a low level of over and undershoot of output signals over a wide range of the limited amplifier output signals and has an output connected to central processor unit controlled linear amplifier means for generating gain controlled high fidelity output signals characterized with low over and undershoot and a high extinction ratio for driving the modulator.

Abstract: A synchronous encoder with an output that is limited by the propagation delay of only a single component. The encoder signal, which is initially NRZ, is first aligned with the clock data, then converted to RZ, using a synchronized signal part. Then, it is converted from RZ to NRZ-M, and the output is retimed. The signal can be used to drive an optical modulator for the purpose of generating an optical RZ output.

Abstract: Apparatus and method for recovering clock and data signals from received transmission line information and for regenerating the recovered clock and data signals. The apparatus comprises a clock detector for recovering and generating a clock signal from the received transmission line information and a data detector for recovering and regenerating data contained in the received transmission line information and directional coupling apparatus for magnetically coupling the received transmission line information with the clock and data circuitry.