Per-band link control transients protection in distributed fiber Raman amplifier cascades

Abstract

Abstract-In this work we introduce the use of the per-band link control method in cascades of distributed fiber Raman amplifiers (DFRAs) for compensating power transients of WDM channels. By using two compensation channels, each one controlled by a proportional-integrative electronic control circuit and assigned to a particular signal band, the power excursion achieved in the surviving channels, in a cascade of 10 DFRAs, is reduced from 4.88 dB to 0.24 dB, when 17 out of 20 channels are added or dropped. By adding more compensation channels, this transient protection technique can be extended to wideband DFRAs applications.

Link control protection in cascades of optical Hybrid Amplifiers (EDFA + DFRA)

“…A total of 20 WDM channels is introduced at time t = 0 ms, of which 17 are removed (channels 1, 2, 3, 4, 5, 6,8,9,10,12,13,14,16,17,18,19 and 20) at time t = 1 ms and then readded at time t = 2 ms. Each curve has been advanced 250 µs, time corresponding to the propagation delay of 50 km of Raman fiber. Fig.…”

“…The link control technique, originally designed to mitigate transient effects in EDFAs [13]and lately in DFRAs [6], is here applied to cascades of HAs.…”

“…Power transients and their control have been extensively studied in cascades of EDFAs and DFRAs [5][6]. Nevertheless, the transient response of HAs has been treated experimentally in limited scenarios, without giving a rigorous analysis of the obtained results [7][8][9].…”