Patent ID: 8634724
Filing Date: 2014-01-21
Classification: H04L

Abstract:
1. An optical OFDM transmitter operating at an overall bit-rate, comprising: an adjustable mapping unit associated with one of N OFDM subcarriers, operable to map M bits of a digital input signal into a constellation point, thereby yielding a subcarrier signal of the corresponding OFDM subcarrier; an adjustable transformation unit, operable to transform the subcarrier signal to yield an electrical output signal; an electrical-to-optical converter, operable to convert the electrical output signal into an optical output signal; and a control unit, operable to set the number of OFDM subcarriers N and the number of bits M, such that the electrical power consumption of the OFDM transmitter is minimized for the overall bit-rate and to adjust the adjustable mapping unit and the adjustable transformation unit according to the selected numbers M and N.