This paper presents modal noise experimental results for matched-clad (MC) and depressed-clad (DC) single-mode fiber designs in various deployment conditions between two imperfect fiber joints. Fiber deployment conditions simulate a cable repair section. If cable repair section deployment conditions are such that the first higher-order mode LP11, which was generated through mode conversion at an imperfect joint, is not attenuated sufficiently, it can be coupled back into the fundamental LP01 mode at a closely spaced second imperfect joint to create modal noise.1,2 The attenuation α11 of the LP11 mode is, therefore, one of the key fiber characteristics that govern the system modal noise power penalty. The fiber cutoff wavelength λcf is defined as the wavelength at which the LP11 mode is attenuated by 19.3 dB relative to the LP01 mode when measured on a 2-m piece of fiber with a single 280-mm diam loop. Since the cutoff wavelength depends on bend and length of fiber, modal noise generation is a function of fiber deployment conditions.3

© 1988 Optical Society of America

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