Real-time implementation of linear spectrograms for the characterization of high bit-rate optical pulse trains

Author

Dorrer, C. ; Kang, I.

Author_Institution

Bell Labs., Holmdel, NJ, USA

Volume

16

Issue

3

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

858

Lastpage

860

Abstract

We demonstrate the first real-time implementation of linear spectrograms for the complete characterization of a train of optical pulses. The spectrogram is composed of the spectra of the train of pulses, measured with a fast scanning microelectromechanical Fabry-Pe´rot etalon, after gating with an electroabsorption modulator at various relative temporal delays programmed with a voltage-controlled phase shifter. The temporal intensity and phase of the train of pulses are retrieved using an iterative deconvolution algorithm with an update rate of 9 Hz allowing real-time optimization and feedback. This diagnostic is validated on 40-Gb/s pulses generated by a LiNbO₃ Mach-Zehnder modulator.

Keywords

deconvolution; electro-optical modulation; electroabsorption; high-speed optical techniques; laser variables measurement; lithium compounds; micromechanical devices; optical feedback; optical pulse generation; phase measurement; phase shifters; pulse measurement; 40 Gbit/s; 40-Gb/s pulses; 9 Hz; LiNbO₃; LiNbO₃ Mach-Zehnder modulator; electroabsorption modulator; fast scanning microelectromechanical Fabry-Perot etalon; gating; high bit-rate optical pulse trains; iterative deconvolution algorithm; linear spectrograms; real-time implementation; temporal delays; voltage-controlled phase shifter; Delay; Modulation coding; Optical pulses; Phase measurement; Phase modulation; Phase shifters; Pulse measurements; Pulse modulation; Spectrogram; Voltage;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2004.823692

Filename

1269819