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37 results on '"Ono, H."'

29. S-band erbium-doped silica fibre amplifier with flattened-gain of over 21 4;dB

Author

Ono, H., Yamada, M., and Shimizu, M.

Abstract

A gain-flattened erbium-doped silica fibre amplifier (EDSFA) has been developed for amplifying WDM signals in the S-band. The EDSFA exhibits a signal gain of over 21 4;dB, a gain excursion of less than 1.9 4;dB, and a noise figure of less than 6.7 4;dB in the 1491–1518 4;nm wavelength range.

Published
2002

30. Low-noise and high-gain 1.58 µm band Er3+-doped fibre amplifiers with cascade configurations

Author

Ono, H., Yamada, M., Kanamori, T., and Ohishi, Y.

Abstract

The authors constructed two low-noise and high-gain 1.58 µm band Er3+-doped fibre amplifiers (EDFAs) with cascade configurations. One consisted of 0.98 and 1.48 µm band pumped silica-based Er3+-doped fibre amplifier units as first and second units, exhibiting a noise figure of 5.0 dB and a signal gain of 32.8 dB for a 1.58 µm band WDM signal. The other employed a fluoride-based Er3+-doped fibre amplifier unit as a second unit and exhibited a noise figure of 5.1 dB and a signal gain of 25.0 dB. Both EDFAs had low-noise and high-gain characteristics.

Published
1997

31. 980 4;nm band pumped Er3+-doped tellurite-based fibre amplifier with low-noise figure of less than 4.5 4;dB

Author

Mori, A., Ono, H., Shikano, K., and Shimizu, M.

Abstract

The amplification characteristics of an Er3+-doped tellurite-based fibre amplifier (EDTFA) with 980 4;nm band pumping are described. The optimum pump wavelength and length of the newly developed EDTF are investigated in order to obtain both a low noise figure and a high gain simultaneously, and realise a low noise figure of less than 4.5 4;dB with a pump wavelength of 976.5 4;nm and a 0.4 4;m EDTF.

Published
2002

32. Low-noise and gain-flattened fluoride-based Er3+-doped fibre amplifier pumped by 0.97 µm laser diode

Author

Yamada, M., Ohishi, Y., Kanamori, T., Ono, H., Sudo, S., and Shimizu, M.

Abstract

The authors demonstrate a gain-flattened Er3+-doped fluoride fibre amplifier with low noise amplification characteristics which employs 0.97 µm laser diode pumping. Excellent flat amplification is achieved with an average signal gain of 12.5 dB and a gain excursion of < 1.0 dB, with a noise figure of 4.7 ± 0.2 dB for an 8 channel WDM signal in the 1532–1560 nm wavelength region. The authors confirm that an Er3+-doped fluoride fibre can be excited effectively to the 4I11/2 level by shifting the pump wavelength from 0.98 to 0.97 µm.

Published
1997

33. Broadband and gain-flattened amplifier composed of a 1.55 µm-band and a 1.58 µm-band Er3+-doped fibre amplifier in a parallel configuration

Author

Yamada, M., Ono, H., Kanamori, T., Sudo, S., and Ohishi, Y.

Abstract

The authors construct a broadband and gain-flattened Er3+-doped fibre amplifier (EDFA) with a flat amplification bandwidth of 54 nm for wavelength division multiplexed signals. This was achieved by employing a 1.58 µm-band EDFA and a 1.55 µm-band EDFA in a parallel configuration. Excellent flat amplification characteristics were obtained for 1530–1560 nm and 1576–1600 nm signal wavelength regions, with a gain non-uniformity of <1.7 dB and a signal gain of 30 dB.

Published
1997

34. 1.58 µm band fluoride-based Er3+-doped fibre amplifier for WDM transmission systems

Author

Ono, H., Yamada, M., Kanamori, T., Sudo, S., and Ohishi, Y.

Abstract

An Er3+-doped fluoride-based fibre amplifier (F-EDFA) with flat amplification characteristics in the range 1565–1600 nm was constructed for the first time. This provided a 5 nm wider flat amplification range than a silica-based Er3+-doped fibre amplifier (S-EDFA). A flattened signal gain of 30 dB was achieved with a gain excursion of 0.9 dB for a WDM signal in this wavelength range. The Er3+-doped fluoride fibre (F-EDF) which achieved a signal gain of over 30 dB without any noise figure degradation had a shorter optimum length than Er3+-doped silica fibre (S-EDF). Furthermore, F-EDF extended the amplification wavelength in the longer wavelength range by 2 nm compared with S-EDF.

Published
1997

35. Signal output characteristics of 1.58 µm band gain-flattened Er3+-doped fibre amplifiers for WDM systems

Author

Ono, H., Yamada, M., Shimizu, M., and Ohishi, Y.

Abstract

The output characteristics of 1.58 µm band gain-flattened Er3+-doped fibre amplifiers (EDFAs) for wavelength division multiplexing (WDM) systems are investigated. It is found that the total output signal power is uniquely determined by the input signal power and the average signal gain of each WDM channel, which is determined by EDF length. It is also found that there is a trade-off between the power conversion efficiency (PCE) and the noise figure. The PCE for low-noise operation is ~45 – 65%.

Published
1998

36. Comparison of amplification characteristics of 1.58 and 1.55 µm band EDFAs

Author

Ono, H., Yamada, M., Shimizu, M., and Ohishi, Y.

Abstract

The amplification characteristics of Er3+-doped fibres for 1.58 and 1.55 µm band amplification are compared. The gain coefficient and power conversion efficiency were higher for the 1.55 µm band than for the 1.58 µm band.

Published
1998

37. 1.58 µm band Er3+-doped fibre amplifier pumped in the 0.98 and 1.48 µm bands

Author

Ono, H., Yamada, M., Sudo, S., and Ohishi, Y.

Abstract

The amplification characteristics of 1.58 µm band Er3+-doped fibre amplifiers pumped in the 0.98 and 1.48 µm bands were investigated. The noise characteristics were improved by adopting 0.98 µm band pumping. There was > 0.3 dB improvement in both the average noise figure and the flatness of the noise figure.

Published
1997

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