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30 results on '"Kanamori, T."'

15. Low-noise Pr3+-doped fluoride fibre amplifier

Author

Yamada, M., primary, Sudo, S., additional, Ohishi, Y., additional, Yoshinaga, H., additional, Oikawa, K., additional, Kanamori, T., additional, Shimizu, M., additional, Terunuma, Y., additional, and Kikushima, K., additional

Published
1995
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25. 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

26. 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

27. 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

28. Nearly transform-limited 1.4 µm picosecond pulse generation by supercontinuum and pulse amplification in Tm-doped optical amplifier

Author

Kawanishi, S., Uchiyama, K., Takara, H., Morioka, T., Yamada, M., and Kanamori, T.

Abstract

Transform-limited 10 GHz picosecond pulse generation is experimentally demonstrated in the 1.4 µm wavelength region by amplifying supercontinuum pulses in a Tm-doped optical amplifier. Through bit error rate measurements, power penalties of < 1.5 dB are found in the range 1450 – 1470 nm.

Published
1997

29. 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

30. Gain efficiency of PbF2/InF3-based praseodymium-doped fluoride optical fibres for 1.3 µm optical fibre amplifiers

Author

Shimada, T., Nishida, Y., Kobayashi, K., Kanamori, T., Oikawa, K., Yamada, M., and Ohishi, Y.

Abstract

The authors have developed praseodymium (Pr3+)-doped PbF2/InF3-based fluoride optical fibres (PDFs) with relative refracfive index differences (Δn) of 2.5, 3.7 and 4.6% for use as high efficiency optical fibre amplifiers. The small signal gain coefficients of the above fibres were 0.18, 0.26 and 0.30 dB/mW. These values are higher than those of ZrF4-based PDFs.

Published
1997

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