Bounds on the power and spectral efficiency of optical fiber communication systems

Ira Jacobs; Seemant Teotia

doi:10.1117/12.630187

25 October 2005 Bounds on the power and spectral efficiency of optical fiber communication systems

Ira Jacobs, Seemant Teotia

Proceedings Volume 6012, Optical Transmission Systems and Equipment for WDM Networking IV; 60120K (2005) https://doi.org/10.1117/12.630187
Event: Optics East 2005, 2005, Boston, MA, United States

Abstract

A bandpass optical channel contains four degrees of freedom (DOF) corresponding to two quadrature phase and two quadrature polarization components. If independent information is sent on each of these four components, the spectral efficiency is nearly four times that achieved when utilizing a single component. For a given spectral efficiency, the minimum number of required photons per bit N_p diminishes with increasing number of degrees of freedom (DOF), but the lower limit on N_p, obtained when the spectral efficiency goes to zero, is 0.693 independent of DOF. For the case of an incoherent channel with square law detection and without polarization filters an upper bound to spectral efficiency and a lower bound to the number of photons per bit is obtained by assuming parallel coherent channels, but in which the same signal is transmitted in each channel. An even tighter bound on performance of the incoherent channel is obtained by computing the mutual information for a specific choice of input distribution utilizing a Markov chain approach.

Citation Download Citation

Ira Jacobs and Seemant Teotia "Bounds on the power and spectral efficiency of optical fiber communication systems", Proc. SPIE 6012, Optical Transmission Systems and Equipment for WDM Networking IV, 60120K (25 October 2005); https://doi.org/10.1117/12.630187

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available