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Mode partition noise
Mode partition noise: In an optical communications link, phase jitter of the signal caused by the combined effects of mode hopping in the optical source[?] and intramodal distortion[?] in the fiber.
Note: Mode hopping causes random wavelength changes which in turn affect the group velocity, i.e. , the propagation time. Over a long length of fiber, the cumulative effect is to create jitter, i.e ., mode partition noise. The variation of group velocity creates the mode partition noise.
Source: from Federal Standard 1037C
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