A study is presented of the fiber properties needed to achieve 10-mode multiplexing transmission. A combination of
MIMO processing with optical LP mode separation is proposed to prevent the need for massive MIMO computation. The
impact of mode crosstalk, differential mode delay, and the mode dependent loss of the few-mode fibers on mode
multiplexing are discussed.
A brief review of three specially designed types of photonic crystal fiber (PCF) that we recently developed for high performance devices is presented. The first is absolutely single polarization PCF (ASPF), which guides only one polarization mode, the second is dispersion-flattened polarization maintaining PCF for Supercontinuum generation, and the third is a new type of photonic bandgap fiber with a super-lattice structure.
Photonic crystal fibers (PCFs) confine light by the regularly aligned cladding air-holes. PCFs can produce large birefringence of >10-3 by asymmetrical structures. Since the polarization mode in the slow axis is hard to couple to the fast axis mode due to the large birefringence, such PCFs can be used as polarization maintaining fibers. To induce such anisotropy, some hole patterns can be considered. In this paper, the structures of polarization maintaining PCFs, two defects type and enlarged type are described. In 100 m fiber, the extinction ratio better than -20 dB and -30 dB were obtained for former and latter type PCF, respectively. We have also examined the cross-talk degradation by the bending distortion. In the bending diameter of 10 mm, the cross-talk degradation was no larger than the measurement accuracy of 0.2 dB in such polarization maintaining photonic crystal fibers, but the 20 dB degradation was observed in the PANDA fiber, which was the conventional polarization maintaining fiber.
Recent progress on soliton transmission is described, in which dispersion management plays an important role in increasing the power margin and the dispersion tolerance in TDM and WDM systems. The quality of the dispersion-managed soliton is compared with RZ and NRZ pulses.
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