Patent ID: 7532824
Filing Date: 2009-05-12
Classification: H04B

Abstract:
1. A driving method of an optical modulator which generates an optical signal modulated in accordance with a data signal to send out said optical signal to a transmission path, comprising: detecting a “011” pattern and a “110” pattern in said data signal, and also generating a delay data signal in which said data signal is delayed by 2 bits; generating a pulse width expanding data signal, in which the pulse width of a “1” signal in a second bit of the “011” pattern and the pulse width of a “1” signal in a second bit of the “110” pattern in said delay data signal are expanded to be wider than the pulse width of other bits, according to the pattern detection result; and driving said optical modulator in accordance with said pulse width expanding data signal, and sending out an optical signal to be waveform-compressed in the transmission path, to the transmission path.