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1 November 1996 Frequency chirp in asymmetric Fabry-Perot electroabsorption modulators for use in the local access network
Mark S. Leeson
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Proceedings Volume 2919, All-Optical Communication Systems: Architecture, Control, and Network Issues II; (1996) https://doi.org/10.1117/12.256360
Event: Photonics East '96, 1996, Boston, MA, United States
Abstract
Frequency chirp in modulator devices is of increasing importance at higher bit rates and increased transmission distances. The chirping behavior of reflective, resonant electroabsorptive optical modulators is analyzed and compared to the non-resonant case for a Framz-Keldysh effect based device. The chirp is found to display oscillatory behavior which is explained by the interaction of the electric field induced changes in complex refractive index with the cavity. The effect of a front face reflectivity lower than that for matching is shown to be poorer modulation and chirping performance. If the front face reflectivity is greater than that needed to match then negative chirp is possible but the insertion loss is greater than 8 dB. By fine tuning the length of the device it is shown that this can be reduced to 3 dB producing a contrast ratio of 4.5 dB and -500 MHz chirp for 400 ps, 15V pulses.
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Mark S. Leeson "Frequency chirp in asymmetric Fabry-Perot electroabsorption modulators for use in the local access network", Proc. SPIE 2919, All-Optical Communication Systems: Architecture, Control, and Network Issues II, (1 November 1996); https://doi.org/10.1117/12.256360
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KEYWORDS
Modulators
Fabry–Perot interferometers
Reflectivity
Modulation
Optical modulators
Picosecond phenomena
Refractive index
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