We report the optical-coding operation of monolithic, ultra-compact optical-CDMA encoder and decoder pair, consisting of InP based integrated AWGs and phase modulators. The encoder and decoder successfully demonstrate eight-bit Walsh code based encoding and decoding. Introduction The Optical Code Division Multiple Access (O-CDMA) technology is a promising approach for future alloptical access n...

Efficient use of a deep-space optical communications channel requires changes to the duty cycle of the modulation as the signal and noise powers change. This can be facilitated by modulating the signal with pulse-position-modulation (PPM), supporting multiple PPM orders. To implement iterative demodulation, which is required by certain error-correction-codes to obtain near-capacity performance,...

Future space missions will have to meet the demand for very high data rates. Transmission of scientific data and other high-bandwidth communications from deep space back to Earth are among the key challenges coming along with next-generation missions to the Moon and beyond. Optical communication has gained significant interest recently as a promising candidate to offer these high data rates. Co...

We designed, built, and demonstrated a highly scalable incoherent optical CDMA platform under DARPA contract which was delivered to Lockheed Martin for additional testing in avionic applications. The platform enables users to communicate with each other at 1.25 Gbit/s per user with raw BER of less than 10 . The system architecture uses (3, 11) fast wavelength-hopping, time-spreading prime codes...

The aim of this work is to prove feasibility of an optical Code-Division-Multiple-Access (CDMA) system based on incoherent encoding of spectrallysliced broadband light sources. Light Emitting Diodes (LEDs) are employed in a multi-mode fiber-optics system and m-sequences are used for the optical encoding. A double-pass configuration with a Littrow grating is used in the optical encoder and decod...

This article proposes to explore parallelism in Turbo-Product Code (TPC) decoding through a parallelism level classification and characterization. From this design space exploration, an innovative TPC decoder architecture without any interleaving resource is presented. This architecture includes a fully-parallel SISO decoder capable of processing n symbols in one clock period. Syntheses results...

In this study, we introduce a design of all-optical module for half-adder/half-subtracter and 2-to-4 decoder that generates simultaneously five of all-optical logic gates at 10 Gbps. These logic gates use dispersion compensation fiber (DCF) based on four-wave mixing (FWM). This design is integrated and economic. The various outputs can be manipulated by controlling nonlinear polarization rotati...

The ITU-G.709, Interface for the Optical Transport Network (OTN) standard [Ref 1] describes the Forward Error Correction (FEC) requirement for an optical transport network. The purpose of FEC is to improve the quality of service on the network and ensure that the data is received without errors. In this application note, the error correction section of the ITU-G.709 standard is examined and imp...