Jw. Lou et al., 80 Gb/s to 10 Gb/s polarization-insensitive demultiplexing with circularlypolarized spun fiber in a two-wavelength nonlineas optical loop mirror, IEEE PHOTON, 12(12), 2000, pp. 1701-1703
We demonstrate the first polarization insensitive demultiplexing of 10-Gb/s
channels from 80-Gb/s pseudorandom bit streams using a two-wavelength nonl
inear optical loop mirror with circularly polarized spun fiber The polariza
tion sensitivity of the device is reduced to <1 dB for >90% transmission, a
nd bit-error-rate measurements show that the remaining polarization sensiti
vity leads to a power penalty difference of 1.5 dB. The nonlinear transmiss
ion is 91% for a switching energy of 4 pJ/pulse, and the full-width at half
-maximum timing window is 9.6 ps, The circularly polarized spun fiber has a
lambda (0) of 1541 nm, a length of similar to1 km, and similar to4.1 times
higher nonlinearity than that of conventional dispersion-shifted fiber. Th
e spin rate is 16 turns/m and the birefringence is Deltan similar to 1 x 10
(-6), corresponding to 25 turns/beat length.