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Low-loss 1.3-μm MQW electroabsorption modulators for high-linearity analog optical links

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8 Author(s)
K. K. Loi ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; J. H. Hodiak ; X. B. Mei ; C. W. Tu
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Low-loss InAsP-GaInP multiquantum-well electroabsorption waveguide modulators have been developed for transmitting microwaves as subcarriers over optical fibers. The fiber-to-fiber insertion loss is only 5 dB at 1.32-μm wavelength. The electrooptic slope efficiency of an 185-μm-long 11-GHz bandwidth device is equivalent to a Mach-Zehnder modulator with a V/sub /spl pi// of 2.2 V. The linearity performance was characterized for a test link without any form of amplification. A RF-to-RF link efficiency of -25.5 dB, noise figure of 27 dB and suboctave spurious-free dynamic range of 114 dB.Hz45/ have been achieved with 16 mW input optical carrier power. The measured 3-dB electrical bandwidth exceeds 20 GHz for a 90-μm-long device.

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IEEE Photonics Technology Letters  (Volume:10 ,  Issue: 11 )