Title :
Options, feasibility, and availability of 2 /spl times/ 4 90/spl deg/ hybrids for coherent optical systems
Author :
Seimetz, Matthias ; Weinert, Carl-Michael
Author_Institution :
Heinrich-Hertz-Inst., Fraunhofer Inst. for Commun., Berlin
fDate :
3/1/2006 12:00:00 AM
Abstract :
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
Keywords :
homodyne detection; light coherence; optical modulation; optical receivers; 2times4 90deg hybrids; active control loop; coherent optical systems; electronic compensation; homodyne receiver; in-phase receiver; multilevel modulation; optical transmission systems; quadrature receiver; transmission impairments; Availability; Digital signal processing; Frequency; Optical devices; Optical modulation; Optical polarization; Optical receivers; Optical signal processing; Phase estimation; Wavelength division multiplexing; Homodyne detection; optical components;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.863251
