Abstract
The explosive growth in Internet traffic will lead to a demand for greater
capacity. Wavelength-division-multiplexing (WDM) transmission using a broad
wavelength region is considered a promising candidate transmission technology
with which to meet this demand. Photonic crystal fibers (PCF) are attractive
in terms of realizing wideband WDM transmission because they have unique features
that are unavailable with conventional single-mode fibers, namely they can
be endlessly single-mode and are capable of dispersion tailoring. We fabricated
long, low loss PCFs. The lowest loss yet achieved is 0.18 dB/km, which is
comparable to that of a conventional single-mode fiber. We also succeeded
in fabricating a 100 km-long, low loss PCF. We have shown the applicability
of these low loss PCFs to broadband optical transmission. We achieved an ultra-wideband
WDM transmission using visible and infrared wavelengths, which indicates the
possibility of building communication systems with a bandwidth of over 263
THz. We obtained a penalty-free 10 Gb/s transmission over a 100-km-long PCF
and also a 40 Gb/s dense WDM (DWDM) transmission over a 46-km-long PCF-DSF
dispersion-managed transmission line by using the 1310 and 1550 nm wavelength
regions. Recently, a supercontinuum source was used to achieve the first WDM
transmission at 1000 nm, namely in a new optical communication band. This
revealed the possibility of transmitting at more than 1 Tb/s in the 1000 nm
band. We also achieved a 160 Gb/s optical time-division-multiplexing (OTDM)
transmission over a 26 km PCF. We discuss the potential capacity of PCFs with
a view to realizing Pb/s transmission in the future.
© 2009 IEEE
PDF Article
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