摘要:
The present invention provides an optical receptacle having a superior insertion/extraction performance of the ferrule, and an optical sub-assembly applying the optical receptacle. The optical receptacle 1 includes a stub, a bush 4, a sleeve, and a sleeve cover. The stub having a lower portion covered by the bush, and an upper portion covered by the sleeve. The sleeve may be a rigid sleeve without any slit along the optical axis in its outer surface. The sleeve cover covers the sleeve and the bush. In the present optical receptacle, the bush is press-fitted into the gap formed between the stub and the sleeve cover. Accordingly, in addition to the application of the rigid sleeve, not only the sub is hard to slide out from the sleeve, but also the insertion/extraction performance of the ferrule to be inserted into the sleeve may be enhanced.
摘要:
An optical transmission and receiver module suitable for a single-fiber bi-directional communication includes a light emitting device, a photodiode, an optical path routing element which allows light emitted from the light emitting device and light directed to the photodiode to pass through the element and which changes their optical paths, as required, and a lens transparent to both light emitted from light emitting device and light directed to the photodiode.
摘要:
A jointing holder for an optical module for single-fiber bidirectional communication comprises a unitarily structured cylindrical body that has the following portions: (a) an optical fiber-fixing portion for securely holding an optical fiber for transmitting multiwavelength light bidirectionally, (b) a semiconductor laser-fixing portion for securely holding a semiconductor laser for emitting outgoing light λ1, (c) a photodiode-fixing portion for securely holding a photodiode for receiving incoming light λ2, (d) an optical path-forming space for optically coupling the optical fiber, the semiconductor laser, and the photodiode, and (e) in the optical path-forming space, an optical filter-fixing face for securely holding an optical filter for separating multiplexed wavelengths. The jointing holder enables the optical module to reduce the number of components, to be miniaturized, and to reduce the dimensional deviation at the time of the assembly, enabling high-precision assembly. An optical module for single-fiber bidirectional communication incorporates the jointing holder.
摘要:
An optical communication device including optoelectronic (LD, PD, LD/PD) elements allocated to a top surface of a circuit board and electronic, electric elements (IC, R/C) allocated to a bottom surface and to the top surface of the circuit board.
摘要:
In optical module 1a, substrate 3 has first and second regions 3a, 3b and first and second optical waveguides 3c, 3d. First and second regions 3a, 3b are arranged along a predetermined plane. First and second optical waveguides 3d, are provided in the first region 3a and extend in a direction of a predetermined axis. Semiconductor light emitting device 7 includes a semiconductor light emitting element 7a optically coupled to first optical waveguide 3c and provided in second region 3e. Semiconductor driving element 9 is electrically connected to semiconductor light emitting element 7a. Semiconductor driving element 9 is mounted on mount member 13. Optical element 15a reflects a part of incident light and transmits a part of the incident light, and semiconductor light receiving device 17 includes a light receiving element 17a provided in first region 3a so as to be optically coupled to optical element 15a.
摘要:
An optical communication module includes (a) at least one light-emitting device, at least one light-receiving device, or a combination of these; (b) an optically coupling means coupled optically with the device or each device; (c) an electric-circuit part connected to the device or each device; (d) multiple layers of electroconductive media supporting the device or devices, the optically coupling means or these optically coupling means, and the electric-circuit part or parts; and (e) a connector portion formed at the end portion of each of the electroconductive media. The insertion of the next-stage circuit substrate between the connector portions enables the electrical connection between the module and the next-stage circuit substrate having a multitude of leads without requiring a large space. An insulating spacer placed between the layers of the electroconductive media secures the electrical and thermal insulation. The module has a property of high-speed response.
摘要:
A transmitting and receiving module helps reduce electrical crosstalk and noise during transmitting and/or receiving signals. Electrical isolation among metallized electrodes in a surface-mounted module with an optical fiber and an optical device can be achieved by using a low resistivity Si substrate, providing ground terminals on the surface of the Si substrate, and grounding the Si substrate. Noise and crosstalk during transmitting and receiving signals can be reduced by providing a copper contact adhered to the bottom surface of the Si substrate and by grounding.
摘要:
A photodiode which senses only &lgr;2 without WDM in optical communication systems containing two signals of different wavelengths &lgr;1 and &lgr;2. The photodiode has a filter layer whose band gap wavelength &lgr;g satisfies an inequality of &lgr;1
摘要:
A semiconductor laser device in which a housing with an optical fiber inserted in is secured to a header with a semiconductor laser chip mounted on is integrated, the light emitting surface of the semiconductor laser chip and the end surface of the optical fiber are opposed to each other, and there is provided a photodiode chip for detecting the signal light emitted from the backside (rear end surface) of the light emitting surface of the semiconductor laser chip, in the top incidence type photodiode chip having a pn junction area of the structure as a photo-sensing region, the first region is surrounded by a second region of the second conductivity type formed at a portion of the semiconductor layer. The second region has the same or larger depth as or than that of the first region. Thus, even if a light is directed to the outside of the photo-sensing region, extra charges into the photo-sensing region is prevented.
摘要:
An optical module 1 comprises a first optical element F1, a first light receiving subassembly PD1, a second optical element F2, a second light receiving subassembly PD2, a light emitting subassembly LD3 for generating light, and a light transmitting part 3 optically coupled to the first optical element. The light emitting subassembly LD3, the first optical element F1, the second optical element F2 and the first light receiving subassembly PD1 are arranged along a predetermined plane S1. The light emitting subassembly LD3, the first optical element F1, the second optical element F2, and the second light receiving subassembly PD2 are arranged along another predetermined plane S2. The predetermined plane S1 intersects at a predetermined angle with the other predetermined plane S2.