Title :
Frequency tracking of tunable liquid-crystal wavelength filter for WDM transmission
Author :
Patel, J.S. ; Wullert, J.R., II ; Maeda, M.W.
Author_Institution :
Bellcore, Red Bank, NJ, USA
Abstract :
The authors show that the drift in the pass-band of a liquid crystal Fabry-Perot tunable filter caused by temperature variations can be controlled by using electronic feedback. The circuit locks onto the wavelength of the incoming signal and adjusts the drive voltage that is applied to the liquid crystal to compensate for any shifts. Bit-error-rate measurements were used to show that the use of such feedback can extend the operating temperature range by tens of degrees. The purpose was to investigate the effect of this modulation on the bit-error-rate in a data transmission system.<>
Keywords :
electro-optical devices; feedback; frequency division multiplexing; liquid crystal devices; multiplexing equipment; optical filters; optical modulation; tuning; WDM transmission; bit-error-rate; compensation; data transmission system; drive voltage; electronic feedback; feedback; frequency tracking; operating temperature range; optical modulation; pass-band; signal wavelength locking; temperature variations; tunable liquid-crystal wavelength filter; wavelength division multiplexing; Fabry-Perot; Feedback; Filters; Frequency; Liquid crystals; Temperature control; Temperature distribution; Tunable circuits and devices; Voltage; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
