A 1.3 µm edge-emitting LED is used to launch an average optical power of 13.7 dBm into single-mode fibers. This permits analog video signal transmission over a distance of 42 km with a loss margin of 5 dB. No degradations of DG, DP, and signal-to-noise ratio have been observed.

Buried heterostructure waveguides with high coupling efficiency for dual shaped core fiber with zero dispersion at 1.55 µm are described. Calculations reveal that the mode mismatch loss of 0.35 dB with mode confinement coefficient of 0.6 can been achieved for dual shaped core single-mode fibers. While, for conventional single-mode fibers, mode mismatch loss becomes large.