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Electronic pre-equalization of chromatic dispersion for 43 Gb/s DQPSK has been demonstrated employing a developed test chip. The chip enables the BER in fibre with 2450 ps/nm of dispersion to be improved to 7.6E-05 without an optical dispersion compensator.
This paper proposes a novel scheme of quantum cryptography with the two-photon interference of a non-maximally entangled photon pair. The security is based on the impossibility of the local unitary transformation between the certain non-maximally entangled states.
In order to consider impairment simply and to satisfy quality-of-signal requirements in all-optical networks, we propose the new TE-constraint of ldquological distancerdquo which covers several impairment factors converted into distance.
A technique to design signaling and management communication networks (SCN and MCN) is proposed based on experiments using a GMPLS-enabled network. This design technique will provide SCNs and MCNs with a sufficient bandwidth for packet loss-free and jitter-less transmission.
This paper discusses a method of reducing the polarization dependence of gain (PDG) of a distributed Raman amplifier. Reducing its PDG is important for a Raman amplifier because it is higher than that of an erbium-doped fiber amplifier and can degrade transmission performance. Raman PDG is determined primarily by two factors, namely 1) polarization-mode dispersion (PMD) of the transmission fiber and...
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