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In this paper, we demonstrate a 10.66 Gb/s bidirectional TDM over long-reach WDM hybrid PON supported by distributed Raman amplification, and the power budget margin is measured to be 15 dB for downstream transmission and 12 dB for upstream transmission, with dual Raman pump power of 300 mW.
Hidenori TAGA Shu YAMAMOTO Kiyofumi MOCHIZUKI Hiroharu WAKABAYASHI
2.4 Gbt/s WDM and bidirectional transmission experiments has been demonstrated in the 1.55µm window. The penalties due to cross talk in the demultiplexer are investigated. The system experiments of WDM and bidirectional transmission result in the system penalties of less than 0.3 dB.
Masatoshi SUZUKI Noboru EDAGAWA Hidenori TAGA Hideaki TANAKA Shu YAMAMOTO Yukitoshi TAKAHASHI Shigeyuki AKIBA
Feasibility of 20 Gbit/s single channel transoceanic soliton transmission systems with a simple EDFA repeaters configuration has been studied. Both a simple and versatile soliton pulse generator and a polarization insensitive optical demultiplexer, which can provide a almost square shape optical gate with duration of full bit time period, have been proposed and demonstrated by using sinusoidally modulated electroabsorption modulators. The optical time-division multiplexing/demultiplexing scheme using the optical demultiplexer results in drastic improvement of bit error rate characteristics. We have experimentally confirmed that the use of alternating-amplitude solitons is an efficient way to mitigate not only soliton-soliton interaction but also Gordon-Haus timing jitter constraints in multi-ten Gbit/s soliton transmission. Timing jitter reduction using relatively wide band optical filter bas been investigated in 20 Gbit/s loop experiments and single-carrier, single-polarization 20 Gbit/s soliton data transmission over 11500 km with bit error rate of below 10-9 has been experimentally demonstrated, using the modulator-based soliton source, the optical demultiplexer, the alternation-amplitude solitons, and wide-band optical filters. Obtained 230 Tbit/skm transmission capacity shows the feasibility of 20 Gbit/s single channel soliton transoceanic systems using fully practical technologies.
Shu YAMAMOTO Hidenori TAGA Hiroharu WAKABAYASHI
The chromatic dispersion limitation for the longspan high-speed transmission using a LiNbO3 Mach-Zehnder modulator was estimated by computer simulation techniques taking account of the chirping effect in the modulator. The simulation result shows that the allowable chromatic dispersion to satisfy the 10% eye closure is around 10,000 ps/nm at 2.5 Gbit/s.
Hidenori TAGA Noboru EDAGAWA Masatoshi SUZUKI Shu YAMAMOTO
This paper describes the wavelength division multiplexing technology for the long-haul optical communication system, especially for the undersea cable system. At first, the present WDM technology for the undersea cable system is reviewed briefly. After that, some experiments using compensation of the dispersion slope of the transmission fiber are discussed as future technical options of undersea systems with over 100 Gbit/s capacity.
Hidenori TAGA Jyun-Yi WU Wei-Tong SHIH Seng-Sheng SHU
Transmission performance of amplitude and phase shift keying (APSK) format is studied theoretically. The extinction ratio of the amplitude shift keying (ASK) signal of the APSK format causes a trade-off of the performance between the ASK and the phase shift keying (PSK) signal of the APSK format. Then, zero-nulling method is proposed to improve the performance of the APSK format, and its effectiveness is confirmed by the numerical simulation.
Hidenori TAGA Shu YAMAMOTO Kiyofumi MOCHIZUKI Hiroharu WAKABAYASHI
2.4 Gbit/s transmission experiment over 301 km employing five semiconductor-laser optical amplifiers in cascade has been demonstrated. The results present the feasibility of the long span optical fiber transmission using semiconductor-laser optical amplifiers.
Shu YAMAMOTO Hidenori TAGA Kiyofumi MOCHIZUKI Hiroharu WAKABAYASHI
An optical amplifier repeater using two-stage semiconductor laser amplifiers with automatic power control (APC) system was inplemented for the first time. The APC system was realized by the direct monitoring of the amplified signal power. The assessment of the optical amplifier repeater confirmed the usefulness of the APC syster.
Yuta WAKAYAMA Hidenori TAGA Takehiro TSURITANI
This paper presents an application of low-coherence interferometry for measurement of mode field diameters (MFDs) of a few-mode fiber and shows its performance compared with another method using a mode multiplexer. We found that the presented method could measure MFDs in a few-mode fiber even without any special mode multiplexers.
Hidenori TAGA Shu YAMAMOTO Kiyofumi MOCHIZUKI Hiroharu WAKABAYASHI
2.4 Gbit/s 4 WDM transmission experiment using a traveling-wave laser amplifier has been demonstrated. The result indicated that there exists the appropriate optical input power to the laser amplifier in order to minimize both interchannel crosstalk penalty and beat noise induced penalty.