H. Suzuki

1-Tb/s (100 x 10 Gb/s) super-dense WDM transmission with 25-GHz channel spacing in the zero-dispersion region employing distributed Raman amplification technology

We achieve 1 Tb/s (100/spl times/10 Gb/s) super-dense WDM (super DWDM) transmission with 25-GHz channel spacing (0.4 bit/s/Hz spectral efficiency) in the zero-dispersion region over a 4/spl times/80 km dispersion-shifted fiber by employing backward pumped distributed Raman amplification and forward error correction. By adopting bi-directional pumping, we present experimental results showing that the transmission distance is extended approximately threefold to 1040 km.

22 x 10 Gb/s WDM transmission based on extended method of unequally spaced channel allocation around the zero-dispersion wavelength region

This letter proposes all unequally spaced channel allocation method that increases the number of channels around the zero-dispersion wavelength region. The validity of this method is confirmed by numerical simulation considering the fluctuation of the zero-dispersion wavelength existing along the installed 1.55-/spl mu/m dispersion-shifted fibers (DSFs). A 22/spl times/10 Gb/s transmission experiment over 320 km of DSF using the wavelengths ranging from 1532 to 1562 nm is successfully conducted by employing this method.

Dynamic gain control by maximum signal power channel in optical linear repeaters for WDM photonic transport networks

The concept of a dynamic gain control method that automatically selects the maximum signal power and keeps it constant is described. This method can cope with not only changes in the number of channels, but also signal power fluctuations. No specific control channel is needed and gain control is active as long as just one signal channel is present. This methods feasibility is confirmed by eight-channel WDM power transient measurements.

Power excursion suppression in cascades of optical amplifiers with automatic maximum level control

The automatic maximum level control scheme, which automatically selects the maximum power channel as the control channel and keeps its maximum power constant, is the most attractive candidate among gain control techniques applicable to wavelength-division-multiplexed linear repeaters. The design guidelines of this scheme are presented. The power transient response and bit-error-rate performance of the remaining channels during changes in the number of channels are measured in cascades of four repeaters. It is experimentally confirmed that power excursions and power penalties at the bit-error rate of 10/sup -9/ can be suppressed to less than 0.7 dB and less than 0.3 dB, respectively, even when seven out of eight channels are dropped within 1 /spl mu/s.

Optical carrier supply module applicable to over 100 super-dense WDM systems of 1000 channels

This paper presents a prototype of an optical carrier supply module (OCSM) with a 12.5-GHz spaced 256-channel WDM carrier generator applicable to over 100 super-dense WDM systems and describes its scalability to 1000 channels.

WDM linear repeater gain control scheme by automatic maximum power channel selection for photonic transport network

Summary form only given. In this paper, we propose a novel gain control method that does not require any extra channel. We show the proposed gain control method. An optical repeater consists of a two-stage EDFA with automatic gain control (AGC) and a variable optical attenuator has been proposed as a low noise and wide dynamic range EDFA.

12.5-GHz-spaced super-dense WDM ring network handling 256 wavelengths with tapped-type OADMs

We demonstrated a two-fiber WDM ring network that handles 12.5-GHz-spaced 256 wavelengths using a tapped-type optical add drop multiplexer (OADM) consisting of small-scale 12.5-GHz-spaced arrayed waveguide gratings (AWGs) and BPFs. The feasibility of the network employing the prototype OCSM was shown by transmission experiments.

Triple-wavelength-band WDM transmission technologies

This paper first described design guidelines of multi-wavelength-band WDM transmission systems that avoid the degradation caused by inter- and intra-wavelength-band nonlinear interactions. The guidelines indicate the best combination of wavelength bands for realizing triple-wavelength-band WDM transmission. After discussing the performance of multi-wavelength-band WDM transmission systems, a 1000-channel WDM carrier generator was demonstrated for realizing advanced triple-wavelength-band WDM transmission systems.

Seamless 32/spl times/10 Gb/s transmission over 320 km of 1.55 /spl mu/m dispersion-shifted fiber using wavelengths ranging from 1546 nm to 1587 nm

This paper demonstrates 32/spl times/10 Gbit/s transmission over 1.55 /spl mu/m dispersion-shifted fiber. The channels are seamlessly allocated from 1546 nm to 1587 nm. Wideband optical amplifiers employing distributed Raman amplification are used as in-line amplifiers.