Optical waveguides – With optical coupler – Particular coupling function
Patent
1991-05-14
1993-05-11
Ullah, Akm E.
Optical waveguides
With optical coupler
Particular coupling function
359154, 359156, 385 31, 385 39, H04B 900, G02B 626
Patent
active
052108082
ABSTRACT:
Active-fiber optical amplifier connected to optical fiber lines or a telecommunication signal source through energy reflection limiting means, such as optical isolators, for limiting the reflected energy, due to Rayleigh scattering, which reaches the active fiber, to permit increased amplifier gain. The input of the active fiber is connected to a dichroic coupler which is also connected to a pumping energy source by an optical fiber having a bevelled end surface or an antireflection coating at the energy source end to limit reflection of energy to the active fiber. Also, a telecommunication system including one or more of such protected amplifiers.
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Inoue et al., "Mutual Signal Gain Saturation in Er.sup.3+ -Doped Fibre Amplifier . . . ", Electronics Lett., vol. 25, No. 9, Apr. 1989, pp. 594-595.
Electronics Letters, vol. 24, No. 1 Jan. 7, 1988, pp. 36-38 Gimlett et al., IEEE Phot. Techn. Let. vol. 2, No. 3, Mar. 1990, pp. 211-213.
IEEE Photonics Technology Letters, vol. 1, No. 10, Oct. 1989, pp. 334-336 IEEE, N.Y., USA; M. Z. Igbal et al.
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Patent Abstracts of Japan, vol. 13, No. 8 E-702 [3356] Jan. 10, 1989, p. 72 E 762; & JP-A-63-219 186 Nippon Tel. & Tel. Corp.
Grasso Giorgio
Righetti Aldo
Pirelli Cavi S.p.A.
Ullah Akm E.
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