The development of a 4-channel×10-Gbits/s optical interconnect module based on a silicon optical bench (SiOB) is presented. The 4-channel vertical-cavity surface-emitting laser (VCSEL) and photo diode (PD) arrays are flip-chip assembled onto the pedestals of SiOB using Au/Sn solder bumps to form an SiOB-based bi-directional optical sub-assembly (BOSA) configuration. The optical coupling of VCSEL-to-multi-mode fiber (MMF) and MMF-to-PD without adding coupled optics is −5.2 and −2 dB, respectively. The wide alignment tolerances of 1-dB power variation for the transmitting and receiver parts to be ±15 μm are achieved. The clearly open 10-Gbits/s eye patterns of transmitting part as well as the 10−12-order bit error rate (BER) at the receiving part verify the proposed SiOB-based module is suitable for the application of 4-channel×10-Gbits/s optical interconnects.
In this Letter, the identification device disclosed in the present invention is comprised of: a carrier
and a plurality of pseudo-pixels; wherein each of the plural pseudo-pixels is formed on the carrier
and is further comprised of at least a light grating composed of a plurality of light grids. In a
preferred aspect, each of the plural light grids is formed on the carrier while spacing from each
other by an interval ranged between 50nm and 900nm. As the aforesaid identification device can
present specific colors and patterns while it is being viewed by naked eye with respect to a
specific viewing angle, the identification device is preferred for security and anti-counterfeit
applications since the specific colors and patterns will become invisible when it is viewed while
deviating from the specific viewing angle.
In this paper, the guide-mode resonance (GMR) devices based on a suspended membrane structure is designed and
experimentally demonstrated. The presented membrane structure possesses a simple structure for resonance excitation
and is capable of improving the spectral response. The results of resonance excitation, improving the sideband and low
oscillatory spectrum are presented. Due to the utilization of silicon-based materials, the proposed filter is also potential
candidates to be integrated with other optoelectronic devices for further applications.
In this paper, the design of effective microprism based on the subwavelength periodic lattices is proposed. The
microprism is realized by using a two-dimensional photonic crystal (PhC) structure with a periodic lattice of air-holes.
In order to behave as a homogeneous and isotropic microprism, the PhC structure with a hexagonal lattice should be
operated in the low frequency. By monolithically integrating the effective microprism in the bending area of an optical
waveguide, its wavefront of eigenmode could be tilted correctly to suppress the radiation loss in wide-angle bent
waveguides. In order to demonstrate the feasibility of proposed microprism for low-index-contrast waveguides, an
example of bent waveguide with the eigenmode nearly compatible to the single mode fiber is adopted to design the PhC
microprism. The transmission efficiency as high as 92% for the proposed structure with the bending angle of 12.96° and
the bending radius of 89.09 μm is achieved.
In this paper, silicon-based micro and subwavelength optical elements based on a free-standing silicon nitride (SiNx)
membrane are achieved. These elements, including gratings, microlenses, and holographic optical elements (HOEs), are
designed and used within the visible and infrared regions. These devices can be used as collimators, reflectors, and
wavelength-dependent filters with advantages of simple structure, high efficiency and feasibility to integrate with other
elements into a micro-system chip. In order to demonstrate the advantage of micro-optics of free-standing SiNx
membrane type in integration, a miniaturized optical pickup head module based on a stacked micro-optical system is
developed. This module consisted of a laser diode, a reflector, a grating, a holographic optical element, and some
aspherical Fresnel lenses. The novel microoptical system can overcome the problems encountered in other microoptical
systems such as off-axis aberration, lower optical efficiency or durability, integration and even in fabrication. A focal
spot with a FWHM diameter of 3.3 μm is obtained while the diffraction limited full-width at half-maximum (FWHM) is
0.7 μm. To extend the advantage of micro-optics of free-standing SiNx membrane, the subwavelength optical elements
base on guided-mode resonance is also developed. With various Si-based structures, the filter possesses numerous
properties such as variable bandwidths, low sideband, flattop, and etc. They are also applied as biosensors to detect the
hybridization process of bio reaction for their high sensitivity. The results show that micro and subwavelength optical
elements fabricated on Si-based material will be a candidate for emerging silicon micro-photonics.
A hybrid grism lens, which integrates an off-axis diffractive grating and an on-axis refractive lens onto a prism structure, is developed. The proposed grism lens can simplify the setup of grating-based wavelength-division multiplexing (WDM) device owing to the dual-functional characters combined within only one element. The 100-GHz dense WDM (DWDM) device based on the grism lens is designed with an insertion loss of 2.91±0.53 dB and a crosstalk of 58.02 dB. The tolerance analysis, the allowable grating tilt angle of ±0.5 deg and fiber displacement of ±1 µm, shows that the proposed structure could be practically applied to the grating-based demultiplexers.
We developed a new optical element which integrates an off-axis diffractive grating and an on-axis refractive lens surface in a prism. With this optical element, the alignment tolerance can be improved by manufacturing technology of the grating based WDM device and is practicable for mass production. An 100-GHz 16-channel DWDM device which includes this optical element has been designed. Ray tracing and beam propagation method (BPM) simulations showed good performance on the insertion loss of 2.91±0.53dB and the adjacent cross talk of 58.02dB. The tolerance discussion for this DWDM device shows that this optical element could be practically achieved by either injection molding or the hot embossing method.
We have developed a novel stacked silicon-based microoptical system, which is optical-on-axis and transmissible in both visible and infrared ranges. By using the new microoptical system techniques, we fabricated a miniaturized optical pickup head module. This optical pickup head consisted of a 650nm laser diode, a 45 degrees silicon reflector, a grating, a holographic optical element, and some aspherical Fresnel lenses. These optical phase elements fabricated on a SiNx membrane were free-standing on Si chips. Each element was then stacked by chip bonding. We could obtain a circular focusing spot on the optical disc as small as 3.1um.
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