Title :
Dynamic holographic spectral equalization for WDM
Author :
Parker, M.C. ; Cohen, A.D. ; Mears, R.J.
Author_Institution :
Dept. of Eng., Cambridge Univ., UK
fDate :
4/1/1997 12:00:00 AM
Abstract :
We report a new technique for active management of wavelength division multiplexing (WDM) channels in an optically amplified telecommunications system, based on a polarization-insensitive holographic in-line wavelength filter. Results are presented for the control, amplification and equalization of five WDM channels spaced by 4 nm. Input signal power variations of 8.5 and 2.0 dB are reduced to 0.4 and 0.3 dB, respectively, by switching between two equalising holograms in 5 ms, with signals experiencing gains of up to 3.3 dB while undergoing equalization. An unused channel and amplified spontaneous emission noise from the erbium-doped fiber amplifier (EDFA) have also been suppressed by greater than 18 dB. This is the first demonstration of active holographic spectral equalization for WDM.
Keywords :
equalisers; erbium; fibre lasers; holography; optical filters; optical noise; telecommunication network management; wavelength division multiplexing; 3.3 dB; 5 ms; EDFA; WDM; active holographic spectral equalization; active management; amplified spontaneous emission noise; dynamic holographic spectral equalization; equalising holograms; erbium-doped fiber amplifier; input signal power; optical equalization; optically amplified telecommunications system; polarization-insensitive holographic in-line wavelength filter; unused channel; wavelength division multiplexing; Erbium-doped fiber amplifier; Holographic optical components; Holography; Optical filters; Optical polarization; Power system management; Stimulated emission; Telecommunication control; Telecommunication switching; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
