Abstract
When a phase modulated optical signal at the wavelength of 1.55 μm is transmitted through a 1.3-μm zero dispersion fiber, phase modulation (PM) is converted to amplitude modulation (AM) by fiber chromatic dispersion.1 In optical heterodyne detection, the PM-AM conversion can be compensated by a delay equalizer.2 However, in a repeatered transmission system in which the fiber input power is large after in-line amplifiers. i.e., Er+3-doped optical fiber amplifiers (EDFAs) are used as in-line amplifiers, the refractive index of the fiber is modulated by the amplitude modulation resulting from the PM-AM conversion. This self-phase modulation (SPM) degrades the receiver sensitivity.3
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