Patent ID: 8433202
Filing Date: 2013-04-30
Classification: H04B,H04J

Abstract:
1. An N-carrier optical wavelength division modulator (WDM) transponder/transceiver, comprising: at least one pair of 10 Gb/s optical transmitters whose wavelengths are within a 50 or 100 GHz ITU-T window; and an opto-electronic control circuit driving each optical transmitter, wherein said opto-electronic control circuit includes a multiplexer outputting a control signal, wherein each optical transmitter is driven by the electrical control signal output by the opto-electronic control circuit according to a band-limited optical duo binary modulation technique at 20˜28 Gb/s, wherein said opto-electronic control current further comprises: at least one electronic device to convert a signal from an interface to N lanes of 20˜28 Gb/s differentially-encoded NRZ signals; N driver amplifiers to amplify the N lanes of 20˜28 Gb/s NRZ signals, respectively, wherein the group delay variation of each amplifier is low enough so as not to distort the 20˜28 Gb/s NRZ signals; and N electronic low-pass filters receiving the amplified signals and serving as duobinary encoders; and wherein said at least one pair of 10 Gb/s optical transmitter further comprise: N 10 Gb/s optical transmitters converting the encoded signals into optical signals having N different wavelengths; and an optical combiner to combine the N wavelengths generated from the N 10 Gb/s optical transmitters, and wherein said electronic device has sufficient electronic buffer to manage a skew between the 20˜28 Gb/s lanes.