Patent ID: 7023888
Filing Date: 2006-04-04
Classification: H01S,H04B

Abstract:
1. A method of generating multiple levels of optical signals, said method comprising: providing plurality of electrical currents to an individual laser, said electrical currents comprising a bias current and a first modulation current of a first channel of a multichannel laser driver circuit, a second modulation current of a second channel of said multichannel laser driver circuit and a third modulation current of a third channel of said multichannel laser driver circuit, wherein magnitudes of said electrical currents are independent of each other; and producing optical signals using said electrical currents, each optical signal having an amplitude corresponding to one of said multiple levels; wherein amplitudes of optical signals corresponding to a level are adjustable by independently adjusting a respective electrical current, wherein amplitudes of optical signals corresponding to other levels are not changed by said adjusting.