Optical isolator, optical circuit, and rare-earth-doped fiber op

Details Optical isolator, optical circuit, and rare-earth-doped fiber op Optical isolator, optical circuit, and rare-earth-doped fiber op

1992-06-15

1994-02-01

Gonzalez, Frank

Optical waveguides

With optical coupler

Particular coupling function

385 33, 385 74, 359484, 359485, 372703, G02B 632

Patent

active

052838463

ABSTRACT:
In a polarization dependency type optical isolator comprising wedgelike polarizing prisms 3 and 5 and a Faraday rotator 4, the mode field diameters of an input side fiber 1 and an output side fiber 7 are the same as that of a transmission fiber and an erbium-doped fiber to be connected to them. The shape and other features of each lens are controlled so that the spot size of a parallel ray which is converted from an incident ray by an input side lens 2 is equal to the spot size of a parallel ray which is converted by an output side lens 6 when a reference beam is irradiated from the fiber 7. In a rare-earth-doped fiber optical amplifier using an optical isolator which is configured in a manner similar to this, the connecting portion of the fiber and the optical isolator can be spliced by fusion without increasing the insertion loss of the optical isolator in the forward direction and the connection loss due to a difference in the mode field diameter is reduced. Therefore, the noise figure decreases and the gain increases.

REFERENCES:
patent: 4548478 (1985-10-01), Shirasaki
patent: 4705351 (1987-11-01), Toda
patent: 4712880 (1987-12-01), Shirasaki
patent: 4732452 (1988-03-01), Carter
patent: 4770494 (1988-09-01), Csencsits et al.
patent: 4893890 (1990-01-01), Lutes
patent: 5140598 (1992-08-01), Tagawa et al.
"High gain Er.sup.3+ -doped fiber amplifiers", Mitsubishi Cable Industries, Ltd., 319001822, C-273, pp. 4-315, Yoshida et al., 1990.
"Optical Fiber Amplifier", NTT Opto-Electronics Laboratories, Optics, pp. 276(2)-282(8), Masaharu Horiguchi, May 19, 1990.

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