Abstract: A QPM waveguide includes an optical substrate having periodic domain-inverted regions and non-inverted regions which are arranged alternately, and a waveguide part passing through the domain-inverted regions and non-inverted regions. The substrate is divided into at least two sections each of which has a wave input facet and a wave output facet. At least one band-pass filter layer is disposed on the wave input facet of one section to filter out a signal wave for preventing back conversion so that the energy of the conversion wave can increase. A method for preventing the back conversion is also disclosed.

Abstract: An optical fiber communication method for communication between a transmitting terminal and a receiving terminal includes the steps of: providing an optical fiber to be coupled to the transmitting terminal and including a core that is provided with at least one second-order Bragg grating structure and a cladding that surrounds the core; configuring the transmitting terminal to output a data-carrying optical signal to one end of the core of the optical fiber for subsequent wireless transmission of the data-carrying optical signal via radiation through the second-order Bragg grating structure of the optical fiber; and configuring the receiving terminal to receive the signal radiated by the second-order Bragg grating structure of the optical fiber. A transmitting device is also disclosed.

Abstract: A chirp optical waveguide includes a chirp grating formed in a ferroelectric substrate, and a waveguide part orthogonal to the chirp grating. The chirp grating has a plurality of grating segments and has a normalized grating period ?x/?0 that increases exponentially in each grating segment and decreases stepwise from each grating segment to a following one of the grating segments, where ?0 is an initial grating period at the wave propagation distance of zero, and ?x is a grating period at the wave propagation distance of x. The chirp grating provides high wave conversion efficiency for short pulse widths and effectively compensates for a reduction in conversion efficiency due to chromatic dispersion.

Abstract: An exposure method of forming a three-dimensional lithographic pattern is provided. The method includes providing a substrate. A first photoresist layer is formed on the substrate. The first photoresist layer corresponds to a first exposure removal dose. A second photoresist layer is formed on the first photoresist layer. The second photoresist layer corresponds to a second exposure removal dose different from the first exposure removal dose. Through a first reticle, the first and second photoresist layers are exposed with a first exposure energy, which is in a range between the first exposure removal dose and the second exposure removal dose, so as to form a first removable region. Through a second reticle, the first and second photoresist layers are exposed with a second exposure energy, which is substantially equal to or higher than the higher one of the first exposure removal dose and the second exposure removal does, so as to form a second removable region different from the first removable region.

Abstract: An absorbing article for skin care and antisepsis has a substrate having absorbing ability for liquid and powder, and an augmentation layer, which is a uniform thin layer composed by a chitosan, and said augmentation layer is coated on the substrate, wherein said augmentation layer is not dissolved by water, rendering no mud and wet. The augmentation layer has natural biological care to skin, and has deodorization, antibiotic and sterilization effect, thus preventing bedsore.

Abstract: An optical add/drop multiplexer capable of extracting signals from within a specified waveband in a group of signals containing various wavelengths, and then adding back a new set of signals also within the specified waveband. The multiplexer includes an optical filter plate, a plane reflector and three graded-index lenses. Using a single optical filtering plate and a plane reflector to carry out multiple reflections, intra-band isolation of light signals is improved and cost of production is reduced.

Abstract: A method of positioning reflecting mirrors inside a multi-level optical switch. The multi-level optical switch has a plurality of input terminals and a plurality of output terminals. A first fixed single-sided reflecting mirror and a second fixed single-sided reflecting mirror are installed such that the reflecting surfaces of the first and the second fixed single-sided reflecting mirrors face each other and are parallel to each other. The input terminals are divided into an odd group and an even group. Cross-points of optical paths are computed by feeding the input light paths from the odd group and the even group using a network exchange algorithm. Double-sided reflecting mirrors are positioned at the corresponding optical path cross-points in the double-sided reflecting mirror layout region of the multi-level optical switch.

Abstract: A compact add/drop optical device. The device prevents adhesive material from blocking the light path. The compact add/drop optical device includes a first optical collimator, a second optical collimator, a filter and two spacer rings, wherein the first optical collimator has a pair of optical fibers and the second optical collimator has an optical fiber. The invention is characterized in that the filter is sandwiched between the two spacer rings. Additionally, using a heat-cured epoxy, one spacer ring adheres to the first optical collimator and the filter, and another spacer ring adheres to the second optical collimator and the filter.

Abstract: An absorbing article for skin care and antisepsis has a substrate having absorbing ability for liquid and powder, and an augmentation layer, which is a uniform thin layer composed by a chitosan, and said augmentation layer is coated on the substrate, wherein said augmentation layer is not dissolved by water, rendering no mud and wet. The augmentation layer has natural biological care to skin, and has deodorization, antibiotic and sterilization effect, thus preventing bedsore.

Abstract: An absorbing article for skin care and antisepsis comprises a substrate having absorbing ability for liquid and powder, and an augmentation layer made of chitosan and added to the substrate. The augmentation layer is made of powder, particle, liquid or solution of chitosan, and added to surface or inner part of the substrate, thus forming a protective layer on the substrate. The protective layer has natural biological care to skin, and has deodorization, antibiotic and sterilization effect, thus preventing bedsore.

Abstract: A multi-functional wheel chair comprises a chair seat, a chair leg, two hand supporters, and a back rod. The chair seat includes a chair seat body, and a front side of the chair seat body is formed with an opening. The chair frame is installed below the chair seat and includes a plurality of chair legs, and a lower end of each chair leg is installed with a front wheel and a rear wheel. Two hand supporters each includes a supporter body. A rear side of the supporter body is installed with a handle. Each of the hand supporters is connected to a left and a right side of the chair seat through a first joint device. A back rod includes a rod body. The rod body is connected to a rod frame; the rod frame is connected to the chair frame through a second joint device. The user may be adhered to the rod body of the back rod for cleaning the back. Furthermore, the wheel chair can be moved to be near a commode for cleaning and going to stool.

Abstract: A multi-mirror reflection optical switch structure having two fixed reflecting mirrors and a plurality of parallel positioned double-sided reflecting mirrors, each capable of being raised or lowered. The plurality of double-sided reflecting mirrors are positioned along two to three 45° parallel axes that run from the upper lefthand corner to the lower righthand corner of the optical switch. Each double-sided reflecting mirror can be raised or lowered in order to perform the rearrangeable non-blocking one-to-one function of the 4-by-4 optical switch.

Abstract: A method of positioning reflecting mirrors inside a multi-level optical switch. The multi-level optical switch has a plurality of input terminals and a plurality of output terminals. A first fixed single-sided reflecting mirror and a second fixed single-sided reflecting mirror are installed such that the reflecting surfaces of the first and the second fixed single-sided reflecting mirrors face each other and are parallel to each other. The input terminals are divided into an odd group and an even group. Cross-points of optical paths are computed by feeding the input light paths from the odd group and the even group using a network exchange algorithm. Double-sided reflecting mirrors are positioned at the corresponding optical path cross-points in the double-sided reflecting mirror layout region of the multi-level optical switch.

Abstract: A distress warning sign includes a LED mounting panel mounting with a plurality of light emitting diodes, controlled by a build-in one chip micro computer. The distress warning sign is designed to have a super thin structure and is adapted to be placed on the roof of an automobile to effectively warn coming cars when failure or traffic accident happens. The light emitting diodes on the mounting panel are arranged to form various groups and are operated in selectable operation modes, so that the warning sign either serves as an illuminated distress warning sign for traffic warning sign or an electronic dice game for entertainment.

Abstract: An improved, air cleaner is provided to eliminate the detriment caused by air pollution and cigarette smoke. The air cleaner includes a removable build-in ashtray which is mounted in front of the housing of the air cleaner. At smoking, the ashtray would be opened by removing its cover. When the ashtray is full of ash, it would be removed for emptying and cleaning. The air cleaner is provided with a disposable filter pack inserted into an open slot of the cleaner housing. The filter pack contains an active carbon layer and chemical catalyst and perfume therein.