Options, feasibility, and availability of 2 /spl times/ 4 90/spl deg/ hybrids for coherent optical systems

Autor:	Matthias Seimetz, C.M. Weinert
Rok vydání:	2006
Předmět:	Engineering Direct-conversion receiver Signal processing Homodyne detection business.industry Control system Optical receivers Phase noise Electronic engineering Transmission system business Active control Atomic and Molecular Physics and Optics
Zdroj:	Journal of Lightwave Technology. 24:1317-1322
ISSN:	1558-2213 0733-8724
DOI:	10.1109/jlt.2005.863251
Popis:	Coherent optical transmission systems offer enhanced possibilities concerning multilevel modulation and the electronic compensation of transmission impairments. One of the key components in a homodyne in-phase/quadrature (IQ) receiver is a 2 times 4 90deg hybrid. However, this component is only commercially available in a form that requires an additional active control loop. This paper presents the different possible alternatives for the realization of the 2 times 4 90deg hybrids and discusses their availability and properties, as well as the practical implementation considerations
Databáze:	OpenAIRE
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