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- W2342536521 abstract "In the title paper, Gao et al. have experimentally demonstrated a scheme for filter-less photonic millimetre-wave (mm-wave) generation using a dual polarization quadrature phase shift keying modulator (DP-QPSK). For frequency octo-tupling generation, the X-QPSK modulator is biased such that all the harmonics are suppressed except those that are order of 4l, where l is an integer and combined with the output of the non-modulated Y-QPSK modulator using a polarization beam combiner. Precise setting of the polarizer angle suppresses the carrier, leaving the ±4th sidebands as the strongest harmonics, which is the innovative part of their design. However, a demerit of the design is that, following any change in modulation index, a precise readjustment of the polarizer angle is required in order to suppress the unwanted harmonics (e.g. carrier) without undue suppression of the wanted harmonics. The goal of this comment is to show that, for an appropriate modulation of the Y-QPSK modulator with the design presented by Gao for a fixed polarizer angle, all the harmonics can be suppressed except those that are order of 4l, where l is an odd integer. Hence, a filter-less frequency octo-tupling can be generated without restricting its operation by the careful adjustment of the RF drive signal; rather the circuit can function for a broad range of modulation index (m ~ 2.5 → 7.25). Moreover, the unwanted harmonics suppressed by design mandate 6.66 dB optical and 11 dB electrical advantages over the design presented by Gao and the precise setting of the polarizer angle can be avoided." @default.
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- W2342536521 date "2016-08-15" @default.
- W2342536521 modified "2023-09-25" @default.
- W2342536521 title "Rebuttal to “Photonic Microwave Generation With Frequency Octupling Based on a DP-QPSK Modulator”" @default.
- W2342536521 cites W1662277638 @default.
- W2342536521 doi "https://doi.org/10.1109/lpt.2016.2531419" @default.
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