Cross talk and ghost talk in a microbeam free-space optical interconnect system with vertical-cavity surface-emitting lasers, microlenses, and metal-semiconductor-metal detectors

Xuezhe Zheng, Philippe J. Marchand, Dawei Huang, Osman Kibar, Sadik C. Esener

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

A diffraction-based beam-propagation model is used to study optical cross talk in microbeam free-space optical interconnection (FSOI) systems. The system consists of VCSEL’s, microlenses, and metal- semiconductor-metal (MSM) detectors, with the detectors modeled as amplitude gratings with low contrast ratio (based on experimental results). Different possible cross-talk sources are studied. Results show that, in an optimized system, the cross talk caused by diffractive scattering is not an issue. However, in such systems the principal reflection from a MSM detector surface creates two problems: VCSEL coupling and ghost talk. The coupling of the reflected beam into the VCSEL’s may cause power oscillation (and increase the bit error rate), whereas ghost talk will limit the distance-bandwidth product of the interconnect system. This optical system is also abstracted in HSPICE together with the laser driver and receiver circuits to analyze ghost talk in this system. Results show that at high speed (1 Gbitys or more) these effects negatively affect system performance.

Original languageEnglish (US)
Pages (from-to)4834-4841
Number of pages8
JournalApplied Optics
Volume39
Issue number26
DOIs
StatePublished - Sep 10 2000
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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