Fiber optic amplifier

Details Fiber optic amplifier Fiber optic amplifier

1987-12-22

1989-08-22

Lee, John D.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 43, 372 6, 372 69, G02B 626, H01S 307

Patent

active

048590169

ABSTRACT:
An amplifier for use with fiber optic systems comprises a neodymium YAG crystal placed in series with a signal-carrying optical fiber. The ND:YAG crystal is supplied by the optical fiber with both the signal to be amplified, and pumping illumination. The pumping illumination is coupled onto the optical fiber by a multiplexing coupler which is used to combine the signal to be amplified and illumination from a pumping illumination source onto a single optical fiber. The pumping illumination inverts the neodymium ions within the ND:YAG crystal. The signal to be amplified propagates through this crystal to stimulate emission of coherent light from the neodymium ions, resulting in amplification of the signal. Because this arrangement permits the ND:YAG crystal to be end-pumped with pumping illumination, and because the length of the ND:YAG crystal may be substantially greater that the absorption length for the crystal at the wavelength of the pumping illumination, virtually all of the pumping illumination may be absorbed within the ND:YAG crystal and used for amplification of the signal carried by the optical fiber.

REFERENCES:
patent: 3230474 (1966-01-01), Keck et al.
patent: 3456211 (1969-07-01), Koester
patent: 3731225 (1973-05-01), Wild et al.
patent: 3753145 (1973-08-01), Chesler
patent: 3902130 (1975-08-01), Pike
patent: 3914709 (1975-10-01), Pike et al.
patent: 3957341 (1976-05-01), Taylor
patent: 3975692 (1976-08-01), Mego, Jr. et al.
patent: 4136929 (1979-01-01), Suzaki
patent: 4243297 (1981-01-01), Elion
patent: 4258336 (1981-03-01), Fletcher et al.
patent: 4300811 (1981-11-01), Ettenberg et al.
patent: 4301543 (1981-11-01), Palmer
patent: 4307933 (1981-12-01), Palmer et al.
patent: 4315666 (1982-02-01), Hicks, Jr.
patent: 4335933 (1982-06-01), Palmer
patent: 4342499 (1982-08-01), Hicks, Jr.
patent: 4343532 (1982-08-01), Palmer
patent: 4362359 (1982-12-01), Dammann et al.
patent: 4383318 (1983-05-01), Barry et al.
patent: 4515431 (1985-05-01), Shaw et al.
patent: 4546476 (1985-10-01), Shaw et al.
patent: 4553238 (1985-11-01), Shaw et al.
patent: 4554510 (1985-11-01), Shaw et al.
patent: 4603940 (1986-08-01), Shaw et al.
patent: 4674830 (1987-06-01), Shaw et al.
patent: 4723824 (1988-02-01), Shaw et al.
Kapany et al., "Coherent Interactions Between Optical Waveguides . . . ", J.O.S.A., vol. 58, No. 9, Sep. 1968.
Burrus et al., "Single-Crystal Fiber Optical Devices: A Nd:YAG Fiber Laser", Appl. Phys. Lett., vol. 26, No. 6, Mar. 15, 1975, pp. 318-320.
Bergh et al., "Single Mode Fiber Optic Directional Coupler", Electronics Letters, vol. 16, No. 7, Mar. 27, 1980, pp. 260-261.
Periasamy et al., "Laser Amplification in an Optical Fiber by Evanescent Field Coupling", Appl. Physics, vol. 24, No. 3, Mar. 1981, pp. 201-203.
Digonnet et al., "Analysis of a Tunable Single Mode Optical Fiber Coupler", IEEE J.Q.E., vol. QE-18, No. 4, Apr. 1982.
Injeyan et al., "Light Amplification by Evanescent Wave Coupling in a Multimode Fiber", Appl. Optics, vol. 21, No. 11, Jun. 1982, pp. 1928-1932.
Alferov et al., "Multichannel Duplex Fiber-Optic Communication Line . . . ", Soviet J. Quant. Electr., vol. 12, No. 8, Aug. 1982, pp. 1088-1090.

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