24 January 2011 Inherent RF linearized bandwidth broadening capability of an ultra-linear optical modulator
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Almost all existing resonator-based linearized optical modulators suffer from an inherent RF bandwidth narrowing that limit their applications and performance. Here, we show an ultra-linear optical modulator, called IMPACC, (Interferometric Modulator with Phase-modulating And Cavity-modulating Components) that has three unique RF bandwidth characteristics, which are not present in other resonator-based linearized optical modulators. We demonstrate these unique characteristics by contrasting IMPACC's performance to the Resonator-Assisted Mach Zehnder Interferometer (RAMZI) modulator. First, IMPACC can enhance its linearized RF bandwidth up to ~ 20% of central RF frequency (compared to ~1% for RAMZI). Second, unlike RAMZI, the RF bandwidth enhancement has a near-flat response characteristic across this bandwidth window. Third, IMPACC can maintain an excellent spurious free dynamic range (SFDR) capability (>130 dB at 1Hz bandwidth) across this window. The wide linear bandwidth capability is also demonstrated for modulation frequencies up to 75GHz.
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Benjamin B. Dingel, Andru Prescod, Nicholas Madamopoulos, "Inherent RF linearized bandwidth broadening capability of an ultra-linear optical modulator", Proc. SPIE 7958, Broadband Access Communication Technologies V, 795804 (24 January 2011); doi: 10.1117/12.875714; https://doi.org/10.1117/12.875714

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