Intermediate isolator type fiber amplifier and fiber transmissio

Details Intermediate isolator type fiber amplifier and fiber transmissio Intermediate isolator type fiber amplifier and fiber transmissio

1996-08-23

1999-06-22

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359160, H01S 300

Patent

active

059148080

ABSTRACT:
The fiber amplifier of this invention includes: a first rare earth element doped fiber; a second rare earth element doped fiber; and a pump light source for generating pump light for exciting the first rare earth element doped fiber and the second rare earth element doped fiber, the fiber amplifier receiving analog signal light and amplifying the analog signal light, wherein the fiber amplifier further includes a directional transmitter disposed between the first rare earth element doped fiber and the second rare earth element doped fiber, and a transmittance of the directional transmitter for at least light having the same wavelength as the signal light propagating from the first rare earth element doped fiber to the second rare earth element doped fiber is larger than a transmittance of the directional transmitter for the light propagating from the second rare earth element doped fiber to the first rare earth element doped fiber.

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W. -Y. Guo et al., "High-Speed Bidirectional Four-Channel Optical FDM-NCFSK Transmission Using an Er.sup.3+ -Doped Fiber Amplifier", IEEE Photonics Technology Letters, vol. 5, No. 2, pp. 232-235, 1993.
M. N. Zervas et al., "Efficient Erbium-Doped Fiber Amplifiers Incorporating an Optical Isolator", IEEE Journal of Quantum Electronics, vol. 31, No. 3, pp. 472-480, 1995.
O. Lumholt et al., "Optimum Position of Isolators within Erbium-Doped Fibers", IEEE Photonics Technology Letters, vol. 4, No. 6, pp. 568-570, 1992.
T. E. Darcie et al., "Fiber-Reflection-Induced Impairments in Lightwave AM-VSB CATV Systems", Journal of Lightwave Technology, vol. 9, No. 8, pp. 991-995, 1991.

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