Title :
Highly sensitive squaring circuit for coherent optical communications
Author :
Bødtker, E. ; Welter, R. ; Sessa, W.B. ; Wagner, R.E.
Author_Institution :
TFL, Horsholm, Denmark
Abstract :
A squaring circuit with wide dynamic range and very high sensitivity is presented. The circuit is based on a commercial Gilbert-cell multiplier manufactured in submicron self-aligned bipolar silicon technology. In a 155-Mb/s frequency-shift keying (FSK) experiment, a dynamic range of more than 25 dB was obtained, and error rates well below 10/sup -9/ were demonstrated with an electrical input power of -45 dBm to the squaring circuit.<>
Keywords :
frequency shift keying; light coherence; optical communication equipment; optical links; receivers; 155 Mbit/s; FSK; coherent optical communications; commercial Gilbert-cell multiplier; dynamic range; electrical input power; error rates; frequency-shift keying; sensitive squaring circuit; submicron self-aligned bipolar silicon technology; wide dynamic range; Circuits; Diodes; Dynamic range; Manufacturing; Mixers; Optical fiber communication; Optical receivers; Optical sensors; Optical signal processing; Radio frequency;
Journal_Title :
Photonics Technology Letters, IEEE
