Nippon Telegraph and Telephone Corporation

Hiromu Toba

Yutaka Miyamoto

Yoshiaki Kisaka

Masahito Tomizawa

Akira Hirano

Kazushige Yonenaga

Takashi Ono

Akihiko Matsuura

Kenji Sato

A signal transport system and a transport method are provided. A whole lowspeed signal containing a client overhead received from a client network is transparently subjected to time division multiplexing and an additional overhead is inserted in the whole signal and further subjected to wavelength division multiplexing, so that the digital signal having the addition overhead is transported in the wavelength division mode represented by one wavelength to a receiving equipment.

Transport system and transport method

A system which improves wavelength tolerance, compensates dispersion in a simple way, reduces limitation of the fiber input power is disclosed. The operation includes receiving a clock signal from a system clock source; modulating a single mode optical signal based on the clock signal and generating an optical pulse signal having two longitudinal modes, the frequency interval thereof being n&#xd7;B, n being a natural number and B being a transmission speed; generating a partial response signal by converting a binary NRZ signal from a digital signal source in synchronism with the system clock source; and modulating the optical pulse signal based on the partial response signal, and outputting a binary RZ modulated signal. The binary RZ modulated signal is input into a receiver, where two partial response components in the optical spectra of the input signal are divided, and one or both of the components are received.

Optical transmission method, optical transmitter, optical receiver, and optical transmission system

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Yokosuka, Japan

Hiromu Toba