Title :
Margin measurements in optical amplifier system
Author :
Bergano, Neal S. ; Kerfoot, F.W. ; Davidsion, C.R.
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The margin, or the difference between the received signal-to-noise (SNR) and the SNR required to maintain a given bit error ratio (BER), is important to the design and operation of optical amplifier transmission systems A new tehnique is described for estimating the SNR at the receiver´s decision circuit when the BER is too low to be measured in a reasonable time. The SNR is determined from the behavior of the BER as a function of the decision threshold setting in the region where the BER is measurable. The authors obtain good agreement between the BER predicted using the measured SNR value and the actual measured BER.<>
Keywords :
fibre lasers; optical links; optical receivers; bit error ratio; decision circuit; decision threshold setting; optical amplifier transmission systems; received signal-to-noise; Bit error rate; Circuits; Operational amplifiers; Optical amplifiers; Optical design; Optical receivers; Semiconductor optical amplifiers; Signal design; Stimulated emission; Time measurement;
Journal_Title :
Photonics Technology Letters, IEEE
