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We propose and investigate two-dimensional spatial coherent matched detection using high-speed photodiode array. Without optical spatial filtering/splitting, all mode-division multiplexed (MDM) channels are coherently demultiplexed and detected, ideally yielding 3-dB optical loss for any MDM signals.
This paper reviews our recent research activities on seamless fiber-wireless systems for future mobile networks, including: radio-on-radio-over-fiber; signal processing-aided multiple signal transmission; high-capacity seamless system; and simultaneous power- and radio-over-fiber.
We discuss key device technologies for realization of an optical-fiber-network-connected distributed radar system in the millimeter-wave band using radio over fiber techniques. The radio over fiber technique is useful for precise signal generation and distribution over the fiber network. In the scenario, each millimeter-wave radar head is not necessary to be equipped with a precision radar signal...
A monolithically integrated quantum-dot (QD) optical gain modulator with semiconductor optical amplifier was developed for successful demonstration of error-free Gb/s-order high-speed, 10-km-long transmissions using 1.3-µm multiple wavelength channels from a QD comb laser.
In this paper, we present high-speed photoreceivers and related technologies for frequency compensation techniques, including InA quantum dots photoabsorption technology and an RF interface. A newly developed high-conversion-gain analog photoreceiver was fabricated by using the above techniques and was demonstrated with 16-QAM optical signals.
This paper describes high-speed optical modulation and detection devices for radio-over-fibre (RoF) systems which can distribute millimetre-wave signals over optical fibres with low-loss, and RoF-based high-performance imaging systems which can be used for foreign object debris in runways or railways. High-speed and high-sensitivity photo-detection would be very important to achieve high-resolution...
Error-free Gbps-order high-speed optical data signal generation in a > 5.5-THz ultra-broad optical frequency bandwidth of the O-band was successfully demonstrated using a newly developed quantum dot electro-optic modulator integrated with a semiconductor optical amplifier.
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