Abstract:
An athermal fiber Bragg grating assembly (10). A platform (12) provides two attachment locations and has a first coefficient of thermal expansion. A stick (14) provides two ends (14a-b) and has a second coefficient of thermal expansion. A fiber Bragg grating (16) provides two ends (16a-b) and has effective third coefficient of thermal expansion. One stick end is fixed to one grating end, the other stick end is fixed to one attachment location, and the other grating end is fixed to the other attachment location. The stick has a same cross-section area along its length that is equal to or less than the cross-section area of the grating. And the coefficients and lengths between respective locations and ends are such that the assembly exhibits an effective overall coefficient of thermal expansion approaching zero.
Abstract:
Provided are an optical true-time delay apparatus and a manufacturing method thereof. The optical true-time delay apparatus comprises: an optical fiber composed of a core layer and a cladding layer wrapping the core layer, and having a taper portion formed at a certain part of an outer circumferential surface of the cladding layer, a distance from the taper portion to the core layer being gradually changed along a length direction of the taper portion; a bragg grating formed at a uniform interval in the core layer placed within the section in which the taper portion is formed; and a heating portion formed on a part of the taper portion corresponding to the part where the bragg grating is formed along a length direction of the optical fiber for thereby wrapping the taper portion.
Abstract:
PURPOSE: An optical fiber grating, a method for controlling an effective refractive index of the same and an optical fiber device by using the same are provided to obtain the spectrum which the various elements requires by easily controlling the refractive index. CONSTITUTION: An optical fiber grating includes an optical fiber(21), a coil heater(22), a connection part(24), a control unit(25) and a power supply(26). A plurality of gratings is periodically formed on the optical fiber(21). And, the optical fiber grating further includes a temperature controller to independently control the temperature by each section of the grating of the optical fiber(21).
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a 3D display device and a grating device thereof which can simplify manufacturing processes and substantially improve manufacturing efficiency.SOLUTION: The method includes: providing a photosensitive polymer solution, an electrochromic solution and at least one transparent conductive substrate; mixing a specific quantity X of the photosensitive polymer solution with a specific quantity Y of the electrochromic solution to produce a grating manufacturing solution; placing the grating manufacturing solution between two transparent conductive substrates or at a side of a transparent conductive substrate; and projecting light through a photomask onto the grating manufacturing solution which is polymerized and cured to form a transparent fence-shaped isolating element, where a portion of the grating manufacturing solution remains at a fluid state. According to this invention, the manufacture is completed by a single manufacturing step, so as to substantially improve the manufacturing efficiency. The transparent conductive substrate is placed on a side of a display device and electrically coupled to an electrode portion to form a grating device of a 3D display device.