New multiplexing technique using polarization of light

Abstract

A new scheme for coding optical signals using the polarization of light is described. The coding response is shown to be linear and invariant. As a consequence of the vectorial nature of the electromagnetic waves, this response takes a sinusoidal shape, which limits the number of channels to three. An application to fiber optics transmissions is presented; an experimental 50-m link is described. The performance and loss of the system are discussed as well as the influence of specific factors, such as the coherence length of the source and the random mode-coupling. As a conclusion, the compatibility of this new multiplexing principle with other multiplexing methods is examined.

Mismatched Models to Lower Bound the Capacity of Dual-Polarization Optical Fiber Channels

“…Frequency-dependent delays, but with ∆T (c) = ∆T (c) for all c, increase the rates with respect to the fully synchronized case. We chose the single-carrier delays as ∆T = ∆T (−2) , ∆T (−1) , ∆T (0) , ∆T (1) , ∆T (2) = ( 5 where T 4SC = 4T . These delays were chosen randomly and optimization could increase the rates further.…”

“…Dual-polarization (2-pol) transmission almost doubles the data rates of optical fiber links [1], [2]. The apparent small reduction from a factor of two is caused by nonlinear coupling of polarizations due to the Kerr effect [3], [4].…”

Polarization division multiplexing for optical data communications

“…Both transmission media and DoFP polarimeter filter array are represented by Mueller matrices [48]. Following approach of Herad and Lacourt the models for various transmission media can be derived and used for simulation of high-speed optical data communications systems [23]. The DoFP polarimeter filter array on the CMOS receiver separates optical signals with different polarization angles.…”

“…They showed effective signal separation with two optical channels arranged 90 o apart. Also, there has been some previous work where three optical signals with different polarization angles were sent thru a single-mode fiber cable (without polarization preservation) and these signals were recovered on receiver side of the experiment [23]. This experiment was also performed on an optical bench.…”

Quaternary Polarization-Multiplexed Subsystem for High-Capacity IM/DD Optical Data Links

“…Herard and Lacourt [4] were the first to take advantage of this fact in an optical communication system, experimentally demonstrating a free-space IM/DD link with three SOPs and analog demultiplexing. This was followed by Herard and Lacourt [22], with an extended theoretical analysis accounting for the impact of various factors including polarization mode dispersion and mode coupling on the system's performance. At that time, no more than three SOPs were used for simultaneous data transmission in IM/DD scenarios, and no algorithm for real-time polarization tracking was presented.…”