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A continuous tuning wavelength range of 4.6 nm was achieved for tunable DFB lasers with gratings having a high coupling coefficient of 390 cm-1. This grating can provide a wide stop band for a wide tuning range
We numerically investigated a digitally tunable laser with a chirped ladder filter and a ring resonator with the aim of achieving a wide wavelength-tuning region covering C-band, by clarifying the relation between the gain spectra and the characteristics of the ladder filter. Experimental results are well explained by the numerical simulation model based on multimode rate equations. Introducing a...
We proposed a new MOSBD, which integrates MOSFET and Schottky barrier diode (SBD) in a single chip. The features of the device are that the SBD are fabricated on fine mesa of less than 0.2mum, surrounded by trenches and optimally distributed inside the high density UMOS. We show that the distributed layout of the SBD inside the MOSFET cells is effective to reduce the reverse recovery charge (Qrr),...
Gemotion explores the potential innovation in the convergence of the media content industry and traditional culture that may become more commonplace in the future. In this paper, I will discuss a few examples of such collaborative efforts. Above all, I would like to take this opportunity to look at the issue of how the five senses - particularly, sight, sound and touch - which form the key elements...
A novel continuously tunable DFB laser is proposed that has separated high coupling coefficient gratings with simple current tuning. Deep corrugations designed to realize a high coupling coefficient are fabricated by using dry etching followed by shallow wet chemical etching and slow speed re-growth. A large stop-band width achieved by using a grating with a coupling coefficient as high as 200 cm-1...
A monolithically integrated digitally tunable ring laser has been developed that employs a ladder filter and a ring resonator. The ladder filter selects one channel from the periodic channels of the ring resonator and the stable device performance is achieved by adopting a chirped ladder filter with one dominant passband. The device is capable of 34-channel (100-GHz spacing) digitally tunable laser...
This paper analyzes the effects of parasitic inductances over the conversion efficiency of DC-DC converters by using Spice simulator. It was found that the self-turn-on of the low side MOSFET is triggered by large body diode reverse recovery current. A new multi chip module (MCM) has been developed in order to suppress the self-turn-on of the LS MOSFETs and to reduce the parasitic inductances. The...
The article discusses the established "Closed Material Recycling (CMR)" technology to reuse collected plastics from waste appliances for new appliances, which enables to use plastics as raw material repeatedly. It consists of three major technologies as follows: 1) disassembling technology, 2) property improvement technology of recycled plastic, and 3) quality control technology. And 420...
A 10 Gbit/s /spl times/ 8 ch WDM modulator module with 50-GHz channel spacing is demonstrated. The module contains only one monolithically integrated WDM modulator chip that is only 15 mm /spl times/ 7 mm in size.
The mode-hop-free tuning range is enhanced from 3.9 to 6.0 nm by utilizing the self-phase-adjustment effect in a short-active-region DBR laser. The optical power is more than 1 mW for whole tuning range, and the maximum power of more than 4 mW is observed. This report discusses the self-phase-adjustment mechanism.
A 37-channel 100-GHz-spacing digitally tunable laser operation has been achieved in the monolithically integrated ring laser using ladder filter and ring resonator. The ladder filter selects one channel from periodic outputs of the ring resonator.
We demonstrate a 64-channel WDM wavelength-selective receiver, which is composed of a WDM channel selector and a photodiode. Error-free operation at 1.25 Gbit/s was obtained. Typical sensitivity was -14 dBm. Successful channel switching was confirmed
Single-stage all-optical 3R with the input wavelength retained is demonstrated for the first time at a bit rate of 40 Gbit/s. This was achieved using filter-free all-optical wavelength conversion in a Sagnac interferometer integrated with parallel-amplifier structure (SIPAS).
An 80-Gb/s PMD compensation is demonstrated using a compact differential group delay (DGD) monitor. The monitor is a SOA/PLC hybrid integrated wavelength converter that operates as an all-optical exOR circuit. A large DGD of 25 ps was successfully compensated.
Summary form only given. It has been known that an outgoing laser beam becomes a uniform ring beam having an angle of divergence, when a collimated laser beam is input with an angle to one fact of a multimode optical fiber. The angle of divergence of the laser beam outgoing from the optical fiber is decided by the angle of incidence of the laser beam. If the plane of incidence of the optical fiber...
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