C- and L-Band Parallel Configuration Optical Fiber Amplifier Employing Bundled Er<sup>3+</sup>-Doped Fiber

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We propose a new configuration for a parallel fiber amplifier that can amplify both the C- and L-bands simultaneously by employing bundled Er3+-doped fiber (EDF). The bundled EDF is a candidate amplification medium for multi-core optical fiber amplifiers. Our parallel fiber amplifier is another application of the multi-core amplification medium. The amplifier achieves almost the same signal gain of 20dB for both the C- and L-bands by using a bundled EDF, which is realized by bundling seven identical single-core EDFs.

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