Abstract
This paper discusses the realization of terabit per second high speed and
high spectral-efficiency optical transmissions using much lower speed
electronics and optoelectronics through parallel processing of coherent
optical frequency combs at both the transmitter and receiver. The coherent
and parallel processing enables electrical-to-optical and
optical-to-electrical (E/O and O/E) conversion of wide-bandwidth optical
signals which would otherwise exceeds the capability of conventional
optoelectronics. In the first experiment, an optical frequency comb (OFC)
generator provides 32 comb lines with less than 5-dB power variation.
Subsequently, 1.008-Tb/s modulation capability is realized on 32$\,\times\,$106 OFDM subcarriers with 16-QAM modulation in a 318-GHz seamless
optical bandwidth. It demonstrates an effective way to generate an optical
OFDM signal with tens of times wider optical bandwidth than that of
analog-to-digital converters and digital-to-analog converters (ADC/DAC). The
second experiment demonstrates simultaneous detection of multiple OFDM bands
from a 32-band coherent optical OFDM signal using another optical frequency
comb, a silica planar lightwave circuit (PLC) that implemented the major
optical devices, and two pairs of balanced photodiodes. The experimental
results indicate prospects for an optically integrated coherent optical OFDM
system on a chip-scale platform.
© 2010 IEEE
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