The periodically poled LiNbO 3 (PPLN) based optical parametric amplifier (OPA) is a technology that contributes to the construction of multi-band wavelength-division multiplexing (WDM) optical netw…
We demonstrate a new optical-domain bandwidth extension technology with a simple optical configuration. We use an integrated optical phase-interleaving in-phase-and-quadrature modulator (PI-IQM) co…
We propose partially frozen (PF) multiple-input multiple-output (MIMO) adaptive equalizers (AEQs). By increasing the degrees of freedom (DOFs) of widely used complex 2 × 2 MIMO AEQs, complex 4 × …
We propose advanced maximum likelihood sequence estimation (MLSE) methods for increasing the capacity of short-reach intensity-modulated direct detection (IM-DD) transmissions for economically real…
Signal impairments caused by the relative characteristic differences and crosstalk between electrical in-phase (I) lanes and quadrature (Q) lanes are some of the main obstacles to the development o…
A periodically poled LiNbO 3 (PPLN)-based phase-sensitive amplifier (PSA) has the potential of ultra-low-noise and high-gain optical amplification. For the wideband operation of PSAs in optical fib…
Optical transmission links are generally composed of optical fibers, optical amplifiers, and optical filters. In this paper, we present a channel reconstruction method (CRM) that extracts physical …
Rapid increase of data-center traffic due to the growing use of cloud services and mobile broadband services requires a higher capacity Ethernet link based on an economical approach and high-perfor…
We demonstrate a technology to extend the bandwidth of optical transmitters based on optical time interleaving. An optical time-interleaving in-phase-and-quadrature (IQ) modulator (TI-IQM), which c…
This article proposes an optical parametric amplifier (OPA), as an inline-repeater, using a periodically-poled-LiNbO 3 (PPLN) waveguide with over-10-THz amplification bandwidth, and also presents w…