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To reduce the nonlinear distortion in electrical devices, optical modulators, and transmission fiber, we adopt a companding transform coding technique to reduce the peak-to-average power ratio of the orthogonal frequency division multiplexing (OFDM) signal in an OFDM radio-over-fiber system. By adopting this technique, our experimental results show that the(More)
In this paper, we propose a novel method to reduce the high peak-to-average power ratio (PAPR) of the optical orthogonal frequency division multiplexing (OFDM) signal. The method is based on the technique of the Hadamard transform combined with a companding transform. We experimentally demonstrate that, in an optical intensity-modulation direct-detection(More)
We overview our several field trial demonstrations of large-capacity long-distance wireless millimeter-wave (mm-wave) signal delivery at W-band based on some enabling technologies and advanced devices. First, we demonstrated up to 1.7-km wireless delivery of 20-Gb/s polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal at(More)
We propose a novel method to generate photonic quadrature-phase-shift-keying (QPSK) vector signal by using only one Mach-Zehnder modulator (MZM). Because of the ‘square-law’ by the photo-detector, the amplitudes and the phase of the driving radio-frequency (RF) signal changed after detection. So the amplitude and the phase of the driving radio-frequency(More)
Keywords: Intensity Modulator/Direct Detection optical orthogonal frequency division multiplexing (IM/DD-OOFDM) Hadamard transform Clipping and filtering Discrete cosine transform/inverse discrete cosine (DCT/IDCT) transform Peak-to-average power ratio (PAPR) a b s t r a c t In Intensity Modulator/Direct Detection (IM/DD) optical OFDM systems, the high(More)
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