Low-reflectivity in-line variable attenuator utilizing opticalfiber tapers |
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Authors: | Benner A Presby HM Amitay N |
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Affiliation: | AT&T Bell Lab., Holmdel, NJ; |
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Abstract: | A single-mode inline variable optical attenuator utilizing optical fiber tapers is discussed. Optical attenuation control is achieved through axial separation between two tapers with beveled endfaces aligned within a ceramic sleeve. Increased axial separation causes increased coupling loss between the two taper fundamental modes. Insertion loss of <0.5 dB, attenuation of >75 dB with continuous 0.05 dB resolution, and reflection return loss of better than 58 dB have been realized. Theoretical studies indicate low polarization and wavelength dependence, and inherent insertion loss of <0.1 dB. This design also exhibits simplicity of fabrication |
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