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A 1.3-μm directly modulated InGaAlAs-MQW DFB laser, incorporating an asymmetric corrugation-pitch-modulated (ACPM) grating, operating at 28 Gb/s at 55°C experimentally demonstrated high mask margin of 22% for the first time.
A great improvement of diffraction efficiency in all-optical tunable holographic wavelength filters is shown by activating four corners of the material with photorefractive apodization method by optimizing the intensity ratio of the writing beams.
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