Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2007-04-24
2007-04-24
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S298000, C359S301000, C359S490020
Reexamination Certificate
active
11185874
ABSTRACT:
An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an amplification medium, which is doped with an active material for optical amplification and to which pump light is introduced, for amplifying an optical signal to be output. A reflection-type variable optical attenuator includes a reflecting mirror for reflecting an input light to generate a reflected light, and a magneto-optical crystal arranged in a position where the input and reflected lights pass. The magneto-optical crystal is applied with a magnetic field to induce a Faraday rotation angle therein and thereby vary an attenuation amount of the amplified optical signal, and part of light transmitted through the reflecting mirror is converted, as input monitor light, into an electrical signal.
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Ishiwada Takashi
Naganuma Norihisa
Shukunami Norifumi
Suzuki Yuichi
Bolda Eric
Fujitsu Limited
Hughes Deandra M.
Staas & Halsey , LLP
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