Compensation of Raman scattering and EDFA's nonuniform gain in ultra-long-distance WDM links
- 1 January 1996
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 8 (1) , 139-141
- https://doi.org/10.1109/68.475805
Abstract
Two physical mechanism effects which cause nonuniform spectral gain in a long-distance WDM system are Raman scattering and EDFA's, with the Raman gain increasing with wavelength and the EDFA gain profile in a cascaded-amplifier system having a peak at 1560 nm. Both effects limit system capacity by causing a wide variation in signal powers and SNR among several WDM channels. We analyze the scenario in which these two deleterious effects partially compensate each other so that a more uniform overall spectral gain can be achieved. By adjusting the link-loss between amplifiers and by strategically placing six WDM channels between 1560 and 1563 nm, the SNR differential among these channels is reduced from 10 dB to 0.5 dB for a 10 000 km link, thereby significantly enhancing the system performance.Keywords
This publication has 8 references indexed in Scilit:
- Transmission of many WDM channels through a cascade of EDFA's in long-distance links and ring networksJournal of Lightwave Technology, 1995
- 40 Gb/s WDM Transmission of Eight 5 Gb/s Data Channels Over Transoceanic Distances using the Conventional NRZ Modulation FormatPublished by Optica Publishing Group ,1995
- Guidelines for optimizing system performance for 20 WDM channels propagating through a cascade of EDFA'sIEEE Photonics Technology Letters, 1993
- What is the actual capacity of single-mode fibers in amplified lightwave systems?IEEE Photonics Technology Letters, 1993
- Gain-filtering stability in ultralong-distance linksPublished by Optica Publishing Group ,1993
- A computer model of non-dispersion-limited stimulated Raman scattering in optical fiber multiple-channel communicationsJournal of Lightwave Technology, 1993
- Modeling erbium-doped fiber amplifiersJournal of Lightwave Technology, 1991
- Optical power limits in multi-channel wavelength-division-multiplexed systems due to stimulated Raman scatteringElectronics Letters, 1984