Reduction of bit error rates in optical transmission systems is an important task that is difficult to achieve. As speeds increase, the difficulty in reducing bit error rates also increases. Channels have differing characteristics, which may change over time, and any error correction employed must be capable of operating at extremely high speeds. In this paper, a linear support vector machine i...

Sangjo Park et al. 13 We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depre...

In this paper, we consider the case of a Direct-Detection Direct Sequence Optical Code Division Multiple Access (DSOCDMA) system using Superstructured Fiber Bragg Grating (S-FBG) as encoder/decoder to implement unipolar codes such as Prime Sequence (PS) and Extended Quadratic Codes (EQC) codes. We use the Importance Sampling (IS) technique, which is a variant of the known Monte-Carlo (MC) metho...

Despite their promising improvements in performance and power efficiency, the possibilities of reconfigurable computing in multiprocessor environments are still mainly unexplored. This paper presents a new framework for rapid testing of multicores with application-specific reconfigurable accelerators. The design exploration is a multi-step flow that performs automatic generation of fine-grained...

A fiber Bragg grating (FBG) encoder/decoder scheme based on correlation subtractions of nearly orthogonal M-sequence codes is presented. With proper coder design, a receiver can reject interfering users and obtain quasi-orthogonality between optical code-division multiple-access (CDMA) users in the network. However, optical CDMA networks may be degraded by multiple-access interference (MAI) due...

0030-4018/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.optcom.2008.08.050 * Corresponding author. Tel.: +34 620 100 971; fax E-mail addresses: [email protected] (A unavarra.es (D. Lasaosa), [email protected] (D. Ben We present the theoretical analysis and simulation of an encoder/decoder pair with applications in Optical Code Division Multiple Access (OCDMA) systems. The theo...

We have developed two radiation-hard ASICs for optical data transmission in the ATLAS pixel detector at the LHC at CERN: a driver chip for a Vertical Cavity Surface Emitting Laser (VCSEL) diode for 80 Mbit/s data transmission from the detector, and a Bi-Phase Mark decoder chip to recover the control data and 40 MHz clock received optically by a PIN diode. We have successfully implemented both A...

An orbital angular momentum (OAM) based LDPC-coded modulation scheme suitable for use in FSO communication is proposed. We demonstrate that the proposed scheme can operate under strong atmospheric turbulence regime and enable 100 Gb/s optical transmission while employing 10 Gb/s components. Both binary and nonbinary LDPC-coded OAM modulations are studied. In addition to providing better BER per...

The ever increasing speed of data transmission especially in optical channels, in magnetic recording devices and in wireless links makes it necessary to look at new receiver structures which are capable of high speed processing at low power consumption. Analog, nonlinear and highly parallel operating circuits can perform the task of equalization, differential detection, channel decoding and in ...