In this paper, some devices were reviewed to be used in quantum communications. We presented a low density of
Quantum Dots, which could be used to get single quantum dot as light emitting source for generating single photons. An
analytical model to study the thermal behavior of a solid media in interaction with one, two or three laser beams was
developed using the classical heat equation. Integrated optic micro-ring resonators and its simulated result also are
presented. Development of active micro-ring in silicon is at an early stage, where both vertical and horizontal techniques
are feasible. With the epitaxy growth techniques, a possibility for achieving controllable QD density, size and good
uniformity are proposed. A low density of QDs in range of 10<sup>8</sup> cm<sup>-2</sup> has demonstrated through successive adjustment of
the growth parameters. Details among the devices are presented and discussed.
In this paper, we provide an arrangement for use as optical power mapping from nanowire laser array to a single multimode fiber (MMF) within the visible spectral range. Nanowire laser, which might arrange in array, can be launched into a single MMF by microlens. Based on ray tracing, multi-beam elements of nanowire laser have a good light outputs, which are meridional rays and skew rays input, at the exit face of a single MMF with a length of several ten times millimeter. The research results are useful for realization of high-density information storage and information transfer in the field of digital multimedia and networking, local-loop communication, and medical diagnostics and therapeutics. Our proposed systems allow multimode operation, and have good transmittance. It is a guildline for future micro-photonic device with sub-micron width structure.
In this paper, we design microlens arrays for the improvement of the optical power coupling efficiency of 8x8 planar lightwave circuit (PLC) devices. Eight fiber array input and output are considered for integrated packaging with 8x8 PLCs. A variety of core pitches matching are achieved from 25μm to 127μm between integrated optical chips and fiber array. We presented a simple formula, which is useful for microlens arrays design. Our proposed microlens arrays
provide versatility in a micro-optics package for optical communication. Our results are helpful for low-cost packaging,
monolithic integration optics modularization, and minimization of the optical power coupling loss between fiber array and array module.
In this paper,analysis of a microlens arrays between fiber arrays an vertical cavity surface emitting laser arrays is reported with a variety of optical devices in transverse and vertical core pitch matching from 25 μm to 127 μm. Using 850nm wavelength 8 x 8 VCSEL arrays, we scale down the physical size in area from 4mm<sup>2</sup> to 43 μm<sup>2</sup> ,and minimize the longitudinal coupling length to 1.335mm. The optical power coupling efficiency can be increased above 90% with a flexible optical alignment range 30 μm of our proposed microlens arrays.It is necessary for the requirements of micro-optics package and minimized volume between fiber array and array chips.
In this paper, we introduced an optical switch MEMS with 32 I/O channels. A simple formula is given as a guideline for application in nano-MEMS mirror arrays in optical cross connects networks. Minimized MEMS optical switch cannot only be linked to standard fiber but also can be connected to any other nano-scale optical devices by our designed microlens. We consider the optical switch being scale down to nano-meter order including beam radius at waist 2 μm, the tilt angle of mirror is set as 0.1(rad), the width of nano-MEMS chip is below 1000nm and optical wavelength 1.55 μm by using our designed microlens arrays.
A tightly bending loss technique is developed for application in biomedical WDM fiber sensors. In this paper, we present the measurement and comparison of bending sensor in 1.3 (mu) m and 1.55 (mu) m wavelength region, respectively. A two-wavelength measurement setup is built for bending loss testing. Various wrapping method and turns are invested for studying the bending loss for broadband biomedical sensing system. We found that as the bending loss increases, the oblique angle of wrapping becomes large. These research results is helpful for multi-channel multi- array fiber optic biomedical sensor systems.