In this paper we’ll try to improve conversion gain of an integrated opto-electronic mixer, based on InP/InGaAs hetero junction bipolar transistors in both single and cascode configurations. For this purpose we’ll use a hybrid-Pi model, extracted from physical parameters of HBT transistors. For verification of our results and calibration of software simulator, at first, we compared our simulation results with empirically reported experiments for a prefabricated HBTOEM sample. Then we examine the simulator on our modified proposed HBT to prove its better gain performance. As a result of our improvements, down conversion power gain for the new proposed mixer in comparison with previously reported results is improved about 11dB, 16dB and 19dB respectively in optical modulation frequencies about 200MHz, 1GHz and 10GHz for single mixer. These values for cascode mixer are about 6dB, 10.5dB and 16dB respectively in optical modulation frequencies about 200MHz, 1GHz and 10GHz. These improvements are mainly because, current gain of HBT device has been improved from 130 to 318.
Relying on the next generation chip-scale technology, Plasmonics, here is presented a novel plan for Dielectric-Loaded Surface Plasmon Polariton-based Ring Resonator (DLSPP-RR) switching configuration. The device is a 1x2 switch with a left-rob Y splitter in the middle of coupling region to share the electromagnetic energy between the two straight and bend output waveguides. Like other active devices, specially switching structures, this plan also will have the potential to be prepared as an active device if its trapped-modes into ring resonator can be controlled on the frequency axis. We implemented simulation of the device by means of the rigorous 3D Finite Element Method (3D-FEM) to certificate its truly passive performance. The obtained results are mixed as transmission spectrums of two output ports on a relatively close frequency band around the telecommunication wavelength of λ = 1550 nm.
In this paper we demonstrate, how fast and slow light phenomena in ring resonator can simultaneously be observed at a single frequency, using strongly coupled ring resonators. We also report on the design of a ring resonator with SOI technology that operate in optical wavelength 1.55 micron and have (one micro-ring) a factor for fast light ~22 picosecond (ps) and a factor for slow light ~12 ps with bandwidth ~100GHz with mixing angle (θ) 30 degrees, however depended on mixing angle and number of rings. Using light in a mixed polarization state, we show that fast and slow light can be obtained from a single incident wave packet. We simulate one micro-ring and extend our result to more micro-ring.
In this work we extract a novel formula for optical absorption coefficient of Quantum Dots (QDs) in frame of 8band k.p
modeling. Also this is useful for any other several band k.p frame. Using this formula, we analyze and simulate
absorption spectra for a typical InAs/In0.4Ga0.6As QD, both for TE and TM components of absorption spectra. Size and
alloy fraction of QD is chosen such that the absorption spectra has some components around 1.55μm that will be
applicable for single photon fiber optic communication.
This paper presents a new model for
an absorptive-dispersive optical bit memory using
stimulated Raman scattering slow-light (SRS). The
structure of our model is developed in a low loss
silicon-on-insulator (SOI) waveguide based on
Stimulated Raman Scattering (SRS). Waveguide has
two parts, Raman cell and feedback pass. This model
functions as a memory bit and can store an optical
pulse by generating a pulse train in the output. Also
by using a p-i-n diode structure in Raman cell, the
delay time between OB output pulses can be tuned
through changing the bias voltage.
We investigate nondegenerate four-wave mixing and the resulting high efficiency of wavelength conversion in a semiconductor-optical-amplifier integrated distributed feedback laser, which is one of the latest achievements of photonics technology. For analyzing the amplifier we use a finite-difference beam propagation method based on solution of a modified nonlinear Schrödinger equation, and for the laser we use a coupled-wave approach. We investigated wavelength conversion up to 4-THz pump-probe detuning with lossless conversion up to 400-GHz detuning and a conversion efficiency of −4.8 dB at 1-THz pump-probe detuning. For calibration and verification of the software developed in this study, we have used experimental measurements reported from MIT electronics and Fujitsu research laboratories on a similar device. We have successfully estimated the conversion efficiency of the tested device.
In an experimental demonstration, we've observed some kinds of polarization properties in Optical Diffraction Grating. Trying to explain such observation, we are made to travel back into basic optics principles. We can see that neither classical theory nor mathematical formalism of Quantum- mechanics can deliver an enough bright visual perception about what's happening in atomic-scales causes polarization. But Quantum-Photonics will be able to describe the gradual and partial polarization effects in submicron scales. It consists of both physical description and mathematical formalism for optical phenomena in atomic scales based on particle nature of light.
In this paper we'll introduce a new treatment called photonics -which is based on wave-particle nature of light- to estimate theortically the refractive index of a dense material in microscopic scales. The main result obtained from this research is the prediction of wave- particle unification! In stead of wave- particle Duality nature of light. The starting points in photonics are planck formula, Hamilton principle, Jacobi and Maupertuis' functions. We've successfully estimated microscopic delay parameter "τ", related directly to macroscopic parameter "n": The index of refraction.
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