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Abstract

A wavelength selective optical fiber coupler having various applications in the field of optical communications is disclosed. The coupler includes a first substrate that has an optical input end for receiving a first optical signal. A first grating is formed in the first substrate. A second substrate has an optical input end for receiving a second optical signal. A second grating is formed in the second substrate. The first and second gratings are joined to transfer energy from the second optical signal to the first substrate for combination with the first optical signal. The combined signals are output from an optical output end of the first substrate. The gratings can comprise, for example, in-fiber gratings. Alternatively, at least one of the gratings can be provided in a polished optical block. The coupler can be used to combine a plurality of pump lasers operating at slightly different wavelengths, for input to an optical fiber amplifier having a broad pump band. A specific embodiment of a high power optical fiber amplifier using a neodymium fiber pump laser is also disclosed.

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First Claim