Patent ID: 7412173
Filing Date: 2008-08-12
Classification: H04B

Abstract:
1. An apparatus for generating a Caffier-Suppressed Return-to-Zero (CS-RZ) signal, comprising: a mixer generating a modulator input by mixing data with a half clock signal; a Low Pass Filter (LPF) band-limiting the modulator input data, which has been provided from the mixer, into low frequency band data; a driver amplifier amplifying the modulator input data generated by the mixing of the mixer and the band-limiting of the LPF; and an external modulator generating a CS-RZ signal, in which phases of adjacent pulses are inverted, by applying bias voltage to the modulator input data, which has been amplified by the driver amplifier, to be placed at a null point of a transfer function of the external modulator; wherein the mixer adjusts logical data “0” to data 0 V and adjusts a clock signal to symmetrically swing around 0 V; and wherein the bandwidth of the LPF is adjusted to increase dispersion tolerance of the optical signal while minimizing distortion of the optical signal.