Tetsufumi Tsuzaki

Raman amplification over 100 nm-bandwidth with dispersion and dispersion slope compensation for conventional single mode fiber

We realized a discrete Raman repeater with the dispersion and dispersion slope compensation over seamless bandwidth of 100 nm by using DCF. The gain flatness after transmitting the transmission line was 2.3 dBp-p, and the OSNR was from 34.5 dB to 39.3 dB. We also estimated the improvement of gain flatness by using nine wavelengths of pumping lights, and we theoretically realized the 0.5 dB gain flatness Raman amplifier.

Broadband discrete fiber Raman amplifier with high differential gain operating over 1.65 /spl mu/m-band

A high differential-gain (0.08 dB/mW), low-noise (<5.0 dB), broadband (30 nm) and flat-gain (</spl plusmn/1 dB) fiber Raman amplifier operating over the 1.65 /spl mu/m-band has been demonstrated employing a low-loss highly nonlinear fiber and a broadened pump light source.

Highly nonlinear fiber-based lumped fiber Raman amplifier for CWDM transmission systems

The highly nonlinear fiber (HNLF)-based lumped fiber Raman amplifiers (LRAs) for four- and eight-channel coarse wavelength division multiplexing (CWDM) transmission systems have been investigated. By using the developed LRA, the four-channel CWDM transmission over conventional single-mode fiber (SMF) with the length of 150 km has been successfully achieved.

Hybrid dispersion compensating Raman amplifier module employing highly nonlinear fiber

Dispersion compensating Raman amplifier with reduced power consumption has been demonstrated employing a hybrid configuration comprising DCF and highly nonlinear fiber.

Novel optical hybrid line configuration for quasi-lossless transmission by distributed Raman amplification

We propose a novel lossless transmission line configuration which exhibits significantly small signal power variation along the line by Raman amplification. A hybrid line consisting of two fibers with different Raman gain properties is theoretically investigated, and it is shown that signal power deviation can be suppressed to only 1.2 dB in a 50-km span. Validity of the proposed hybrid line is confirmed by experiments.

3.2 Tb/s-1500 km WDM transmission experiment using 64 nm hybrid repeater amplifiers

3.2 Tb/s (160/spl times/20 Gb/s) RZ signals were transmitted over 1500 km precisely-flattened dispersion managed line with the use of newly developed 64 nm hybrid amplifiers. This is the first demonstration of multi terabit/s, long distance transmission.

Dispersion managed U-band discrete fiber Raman amplifiers for 43Gb/s WDM transmission

We evaluated the eye-patterns of 43Gb/s WDM signals, which were amplified by dispersion managed U-band discrete fiber Raman amplifiers employing highly nonlinear fiber. No degradation of the eye-patterns was observed by adjusting the dispersion.