Patent ID: 8014683
Filing Date: 2011-09-06
Classification: H04B

Abstract:
1. A transmitter for an optical RZ-DPSK communication signal, comprising: a source for an optical carrier; an electro-optical modulator having at least one element with an optical path length modified by an electrical driver signal for intensity modulating the optical carrier based on the driver signal; and a driver circuit for generating the driver signal from an electrical communication signal, wherein the driver signal is an impulse-type signal having impulses of two types spaced in time by a neutral signal state, wherein the impulses of the two types have opposite signs, wherein during the neutral signal state of the driver signal, a transmission of the modulator becomes zero, and the two types of impulses cause the transmission of the modulator to be different from zero and a phase shift which is specific for each type of the impulses, wherein the driver circuit comprises four pairs of switches, each having first and second main ports and a control port, and wherein in each pair, the first main ports of the switches are connected to each other and the control ports of the switches are supplied with mutually inverse input signals.