Coarse and fine bit synchronization for WDM interconnections using two subcarrier-multiplexed control pilot tones

Author

Adamczyk, O.H. ; Cardakli, M.C. ; Cai, J.X. ; Hayee, M.I. ; Kim, C. ; Willner, A.E.

Author_Institution

Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA

Volume

11

Issue

8

fYear

1999

Firstpage

1057

Lastpage

1059

Abstract

We demonstrate the use of high- and low-frequency subcarrier-multiplexed pilot tones as control signals to achieve both coarse and fine synchronization in a bit-parallel wavelength-division-multiplexed optical interconnection. These control signals are located on each of the two outer wavelengths and are combined with the baseband data before transmission. The phase difference of the tones enables: (1) fine synchronization to <1/8 of a bit time in the optical domain for all wavelength channels simultaneously by comparing the high-frequency tones and using a discrete set of wavelength-dependent delays and (2) coarse synchronization over several bit times in the electrical domain by comparing the low-frequency tones and using shift registers.

Keywords

optical fibre communication; subcarrier multiplexing; synchronisation; wavelength division multiplexing; WDM interconnections; baseband data; bit-parallel wavelength-division-multiplexed optical interconnection; coarse bit synchronization; control signals; electrical domain; fine bit synchronization; optical domain; phase difference; shift registers; subcarrier-multiplexed control pilot tones; wavelength-dependent delays; Baseband; Clocks; High speed optical techniques; Optical fibers; Optical interconnections; Optical receivers; Propagation delay; Radio frequency; Synchronization; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.775345

Filename

775345