Title :
Mode coupling in coherent mode-division-multiplexed systems: Impact on capacity and signal processing complexity
Author :
Kahn, Joseph M. ; Keang-Po Ho
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA
Abstract :
Mode coupling is a key to overcoming major challenges in coherent mode-division-multiplexed systems. Strong mode coupling reduces the modal group delay spread, minimizing the complexity of multi-input multi-output signal processing. Likewise, strong mode coupling mitigates the mode-dependent gain of optical amplifiers, maximizing average channel capacity. When combined with modal dispersion, strong mode coupling creates frequency diversity, dramatically reducing outage probability. Remarkably, the statistical distributions of strongly coupled modal group delays or gains depend only on the number of modes and the variances of accumulated delay or gain, and can be derived from the eigenvalue distributions of certain random matrices.
Keywords :
MIMO communication; channel capacity; coherence; communication complexity; diversity reception; eigenvalues and eigenfunctions; electromagnetic coupling; minimisation; multiplexing; optical couplers; optical fibre amplifiers; random processes; signal processing; statistical distributions; average channel capacity maximization; coherent mode-division-multiplexed system; complexity minimization; coupled modal group delays; eigenvalue distribution; frequency diversity; modal dispersion; modal group delay spread; mode coupling; mode-dependent gain; multiinput multioutput signal processing; optical amplifier; outage probability; random matrix; signal processing complexity; statistical distribution;
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2012 Conference Record of the Forty Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4673-5050-1
DOI :
10.1109/ACSSC.2012.6489090
