One or more single mode few-moded or multimode fibers are incorporated into a bundle to carry input to a fiber amplifier or output from a fiber amplifier or a fiber laser. The input is at the signal wavelength, which is the wavelength where amplification or lasing occurs. Each of the fibers in the bundle is cleaved individually or as a group and fiber ends are aligned in the same plane. The fiber amplifier or fiber laser may include a double clad fiber and the other fibers of the bundle couple light for cladding pumping. The device may also include a mode filter for controlling the output mode.

 
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< Semiconductor laser device and method for producing the same

> Receiver transponder for protected networks

> Semiconductor laser element produced by aligning a photomask to pattern an electrode portion superposed on inner portions of upper surfaces of window regions at opposite end faces

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