Optical fiber laser or amplifier including high reflectivity gratings
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United States of America Patent
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Jun 21, 1994
Grant Date -
N/A
app pub date -
Nov 2, 1993
filing date -
Nov 2, 1993
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Abstract
Novel optical fiber devices (amplifiers and lasers) are disclosed. The devices comprise one or more optical 'cavities', depending on the type of device. The cavities typically are formed by means of in-line refractive index gratings in a length of silica-based optical fiber. The gratings typically have peak reflectivity of at least 98%. Use of such cavities enables CW pumping of the devices, making the devices suitable for use in optical fiber communication systems. In an exemplary embodiment the device is a Raman amplifier for 1.3 .mu.m signal radiation, and in another exemplary embodiment the device is a Raman laser having an output suitable for pumping an Er-doped fiber amplifier. An exemplary pump radiation source is a laser diode-pumped CW Nd:YAG laser.
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