Patent ID: 7450860
Filing Date: 2008-11-11
Classification: H04B

Abstract:
1. An apparatus for optical transmission using an FSK scheme, the apparatus comprising: a light generator arranged to generate a first tone signal having a first frequency f a light modulator including an asymmetric mach-zehnder modulator containing a first and a second arm of different lengths and arranged to selectively output one of the first tone signal and the second tone signal input from the light generator according to input data, wherein a difference between the first frequency f wherein the asymmetric mach-zehnder modulator has a wavelength response characteristic wavelength-shifted according to an applied voltage level, the asymmetric mach-zehnder modulator selectively outputs the first tone signal when a bit of the input data is ‘0’, and the asymmetric mach-zehnder modulator selectively outputs the second tone signal when the bit of the input data is ‘1’.