Abstract
We propose and comprehensively investigate a subcarrier-multiplexing (SCM) system based on 62.5-μm-core-diameter multimode fiber (MMF) using a single
wavelength to achieve 10-Gb/s transmission over link lengths beyond 300 m, using 1.3-μm-wavelength lasers with radial offset launch into MMF links. The system utilizes
multichannel SCM transmission using quadrature-phase-shift-keyed modulation in combining baseband transmission with
three passband SCM channels at the carrier frequencies of 3.75, 6.25, and 8.75 GHz while incorporating a maximum
laser modulation bandwidth of 10 GHz to ensure system compliance with the limits of current uncooled laser devices.
A statistical investigation of the system highlights its capability to achieve an acceptable yield over worst-case
MMF links of length 600 m. We also investigate the improvement in system performance granted by allowing a
controlled overlap of frequency spectra of the passband SCM channels. In addition, we test the accuracy of the
previously proposed usable average slope criterion of less than 4 dB/GHz, which is needed to achieve low-penalty
transmission with eye-closure penalties < 3 dB.
© 2007 IEEE
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