Effect of amplifier spacing on four-wave mixing in multichannel coherent communications
Schadt, D.G.
Electronics Letters
Volume 27, Issue 20, 26 Sept. 1991 Page(s):1805 - 1807
Digital Object Identifier   10.1049/el:19911122
Summary:The buildup of four-wave mixing (FWM) is studied for the case of a multichannel coherent system using cascaded optical fibre amplifiers. It is shown, both analytically and numerically, that FW interactions can be either reduced or resonantly enhanced depending on the choice of the amplifier spacing. An example is given of a three channel phase modulated system with a channel separation of 12.5 GHz transmitted over 1000 km. For this example, resonance of FWM occurred at an amplifier spacing of 53 km.

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