1-3hit |
Katsusuke TAJIMA Masaharu OHASHI Yutaka SASAKI
Polarization-maintaining optical fibers with Al2O3 doped silica glass as stress-applying parts (SAPs) and fluorine doped silica glass as cladding are investigated. A high modal birefringence of 1.210-3 due to both thermally and mechanically induced stress is achived.
Photonic crystal fiber (PCF) is a promising candidate for future transmission media due to its unobtainable features in a conventional single-mode fiber. We discuss some important problems to realize a PCF for transmission purpose. We also present recent progress on the PCF as a transmission media.
Kenji KUROKAWA Kyozo TSUJIKAWA Katsusuke TAJIMA Kazuhide NAKAJIMA Izumi SANKAWA
We achieved the first 10 Gb/s WDM transmission at 1064 and 1550 nm over 24 km of photonic crystal fiber (PCF). We confirmed an improvement in the bit error rate (BER) performance after the transmission, namely "negative power penalties" of -0.5 and -0.3 dB at 1064 and 1550 nm, respectively. Our experimental result and theoretical estimation revealed that the signal degradation induced by the chromatic dispersion can be effectively suppressed by employing the pre-chirp technique with a conventional Z-cut lithium niobate (LN) modulator. We also show theoretically that we can expect to realize 10 Gb/s transmission over a 24 km PCF with negligible BER degradation in the 1060 to 1600 nm wavelength range by using the pre-chirp technique.