0.78‐μm digital transmission characteristics using 1.3‐μm optimized single‐mode fiber for a subscriber loop

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<jats:title>Abstract</jats:title><jats:p>The transmission characteristics of digital systems comprised of 1.3‐μm zero dispersion, single‐mode fibers (1.3‐μm SMF) and 0.78‐μm band laser diodes (LD) are investigated. The problems encountered in such systems are the degradation of the transmission bandwidth due to the modal noise and the dispersion.</jats:p><jats:p>This paper describes the transmission‐distance limitations due to the mode dispersion and the range of suitability of short wavelength sources in conjunction with the 1.3‐μm SMFs is clarified. It is shown from the measurement of the long‐term bit‐error rate that the self‐pulsation LDs are useful. It is shown also that the bandwidth‐distance product is limited to 111 MHz km due to the maximum delay difference of 3 ns/km between LP<jats:sub>01</jats:sub> and LP<jats:sub>11</jats:sub> modes of 1.3‐μm SMFs fabricated by the VAD method. Finally, the selection rules of the optical sources are described taking into account the degradations due to the modal noise.</jats:p>

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