Even though OFDM is a well established modulation format in the wireless community, it is relatively new in fiberoptics.
In this paper we give an overview of the past, present and future of optical OFDM for long-haul fiber-optic
transmission systems and discuss several application spaces for the commercialization of optical OFDM.
In this paper, WDM transmission experiments are discussed showing simultaneous compensation of
nonlinear effects and chromatic dispersion through optical phase conjugation (OPC). The performance of
OPC and DCF for chromatic dispersion compensation are compared in a wavelength division multiplexed
(WDM) transmission link with 50-GHz spaced 42.8-Gb/s RZ-DQPSK modulated channels. The feasible
transmission distance for a Q-factor ~10 dB is limited to approximately 5,000 km and 3,000 km for the OPC
and the DCF based configuration, respectively. When the Q-factor as a function of the transmission distance
is observed, at shorter distances, the Q-factor of the OPC based configuration is about 1.5 dB higher than
that of the DCF based transmission system. Up to 2,500-km transmission a linear decrease in Q is observed
for both configurations. After 2,500-km transmission, the Q-factor of the DCF based configuration deviates
from the linear decrease whereas the OPC based performance is virtually unaffected.
In this paper, the performance of mid-link spectral inversion (MLSI)-based transmission is quantitatively compared to the performance for 'conventional' dispersion compensating fiber (DCF)-based transmission. Bit error rates (BER) are measured at optimized residual dispersion for all sixteen channels after 800km transmission in standard single mode fiber (SSMF). We show that for the MLSI-based configuration up to a decade of improvement in BER is obtained compared to the DCF based system. MLSI has the potential of lowering the cost of long haul transmission systems since instead of having multiple DCF modules per span only one spectral inverter is required for the whole transmission line. For spectral inversion, a polarization independent magnesium-oxide-doped periodically-poled lithium-niobate (MgO:PPLN) based subsystem was used.
Conference Committee Involvement (2)
Next-Generation Optical Communication: Components, Sub-Systems, and Systems
24 January 2012 | San Francisco, California, United States
Coherent Optical Communication: Components, Subsystems, and Systems
25 January 2011 | San Francisco, California, United States