Abstract: The present invention provides an optical module for light-transmitting a first optical signal with a first wavelength and light-receiving a second optical signal with a second wavelength in bidirectional. The optical module of the invention includes an optical fiber, a laser diode, a photodiode, an optical filter and a holder for securing the optical filter. The laser diode emits the first optical signal, while the photodiode receives the second optical signal. The filter reflects one of the first and second optical signals and transmits the other of first and second optical signals. The holder of the present invention includes first and second lens both built in the surface of the holder. The first lens faces the laser diode and optically couples the laser diode with the optical fiber, while the second lens faces the optical fiber.

Abstract: 250 ?m is the standardized pitch H of the prevalent multichannel ribbonfibers. Current laser diodes and photodiodes have a size larger than 300 ?m. Curving lightpaths made on a silicon bench for reconciling the chip size with current ribbonfibers causes bending power loss, optical crosstalk and difficulty of production. Linear parallel lightpaths with a width d for more than one chip site are produced on a bench with a pitch E which is equal to the pitch H of the multichannels. Optoelectronic device chips with a width W satisfying an inequality E<W<2E?d are mounted on the lightpaths at spots which are different from neighboring chips in the longitudinal direction.

Abstract: The optical module comprises a ferrule, an optical fiber inserted into the ferrule, an optical communication functional unit for making the optical communication with the optical fiber, and a resin molded portion covering a part of the ferrule and the optical communication functional unit. The ferrule is provided with one or more concave grooves in a region exposed from the resin molded portion. Since this concave portion serves as a resin reservoir at the time of molding, the resin is prevented from adhering and covering on the outer surface of ferrule exposing from the resin molded portion.

Abstract: An optical communications module in which electrical crosstalk is reduced. The term “optical communications module” represents a surface-mounting-type optical tranceiver, transmitter, or receiver module. The optical communications module has a following structure. (a) An Si substrate carries at least one signal-transmitting section comprising an LD, at least one signal-receiving section comprising a PD, or both together with other components. (b) An insulating substrate is bonded to the back face of the Si substrate. (c) A separating groove separates the Si substrate along the or each boundary line between the sections in order to prevent an AC current flowing through the Si substrate. To attain this object, the separating groove is provided from the top surface of the Si substrate to some midpoint of the insulating substrate.

Abstract: A wavelength-multiplexing connector and a transmitting/receiving part can be easily connected to and disconnected from each other. The wavelength-multiplexing connector comprises a single optical fiber, through which a plurality of optical signals having different wavelengths are transmitted, and a wavelength-multiplexer optically coupled to the optical fiber and capable of optically separating an optical signal having a particular wavelength out of the plurality of optical signals. The wavelength-multiplexer comprises a wavelength division multiplexing filter disposed at a midway of a first light waveguide, and a multilayered film mirror for reflecting, at a midway of a second light waveguide, a signal separated by the wavelength division multiplexing filter.

Abstract: A parallel multichannel LD/PD module comprising a bench, a set of M (M; channel number) curving lightpaths (lightwaveguides or optical fibers) having a narrow width region, a width enlarging region and a wide width region which are formed upon the bench, a wavelength selective filter provided at the wide width region for reflecting receiving beams upward, a set of photodiodes installed in front of the wavelength selective filter at the wide width region above the bench and light emitting devices mounted behind the ends of the lightpaths with a wide pitch for yielding transmitting beams. Propagating in outer M-channel element fibers of a ribbonfiber, receiving signal beams go into the lightpaths via the narrow width region, expand horizontally in the width enlarging region, arrive at the wide width region, and are reflected by the wavelength selective filter upward. The receiving beams go into the photodiodes which yield photocurrents in proportion to the powers of the receiving beams.

Abstract: An optical transmission module includes plural optical transmission means (optical waveguides) whose end portions are exposed on a first end face thereof, and at least one of an optical transmitting section and an optical receiving section to each of which some of the optical transmission means are optically coupled. The remaining optical transmission means are exposed on a second end face opposed to the first end face. Only some of the plural optical transmission means are designed to have a communication facility at some position in the longitudinal direction thereof, while the remaining optical transmission means are designed to have the communication facility by being connected to post-stage optical transmission modules in the longitudinal direction. By multistage-connecting these optical transmission modules, plural optical transmission means and optical transmission modules can be collectively connected at a narrow frontage.

Abstract: An optical waveguide-integrated substrate includes a first optical waveguide on part of one side (referred to as the first side) of a substrate and a second optical waveguide on part of the other side (referred to as the second side) of the substrate. Both optical waveguides include a core and a cladding layer enclosing the core. A method for producing an optical waveguide-integrated substrate inpludes preparing a substrate, forming a first optical waveguide on part of the first side of the substrate, and forming a second optical waveguide on part of the second side of the substrate at a temperature different from that for forming the first optical waveguide. An optical transceiver includes the optical waveguide-integrated substrate, at least one optical-signal-transmitting device mounted on the remaining part of the first side of the substrate, and at least one optical-signal-receiving device mounted on the remaining part of the second side of the substrate.

Abstract: 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 ? 1, (c) a photodiode-fixing portion for securely holding a photodiode for receiving incoming light ? 2, (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.

Abstract: In an optical transmitter in which the amount of light of an LD is monitored by a monitor PD, and the power of the LD is kept constant by feedback, the present invention aims to provide an optical transmitter that is suitable for size and cost reductions while being able to input a greater amount of the LD light of to the monitor PD, and that is capable of performing higher-bit-rate transmission. The present invention is characterized in that a concave groove is formed in a substrate, and the monitor photodiode is mounted on a slanted face of the concave groove, and the light of the LD that is oppositely and horizontally disposed is received directly by the monitor the LD photodiode.

Abstract: An optical module includes a semiconductor optical device, an optical fiber, a ferrule, and a mounting component. The optical fiber is optically coupled to the semiconductor optical device. The ferrule holds the optical fiber. The mounting component includes a first support groove for supporting the ferrule and a second support groove for supporting the optical fiber. The semiconductor optical device is mounted on the mounting component. The first and second support grooves are sequentially arranged in a direction of a predetermined axis. The second support groove has one end and the other end. The depth of the second support groove decreases from the one end toward the other end. With such a structure, the optical module allows the optical fiber to be positioned with high accuracy onto the mounting component.

Abstract: The present invention provides a semiconductor laser module in which parasitic inductance due to the bonding wire is removed, accordingly, the high frequency performance thereof can be enhanced. The laser module of the present invention has a sub-mount, on which the semiconductor laser diode is installed and transmission lines for supplying the signal to the laser diode is formed. The transmission lines on the sub-mount are directly connected to corresponding lead pins provided in the base of the package without any bonding wires. Between the lead pins and under the sub-mount is provided a photo diode for monitoring light emitted from the laser diode.

Abstract: 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.

Abstract: The present invention provides an optical module capable of simplifying the assembly thereof. The optical module has a first substrate, an electronic device mounted on the first substrate, an optical device electrically connected to the electronic device, a fiber assembly coupled to the optical device and a housing. The housing has a base and a cover. The base has an opening, into which the first substrate is inserted, and a mounting region where the optical device is mounted thereon. The base and the cover sandwiches and secures the fiber assembly therebetween. The first substrate may be connected to a second substrate provided outside of the optical module with a flexible or a resilient connecting member.

Abstract: An optical communication module, such as an optical transmitter used for optical communication incorporating a semiconductor laser (LD) and a monitoring photodiode (MPD), and an optical transceiver including a photodiode (PD), is efficiently and inexpensively provided. As means therefor, two substrates are used, that is, an expensive and high-accuracy first substrate is accommodated in an recess provided in a second substrate that is inexpensive and that needs less accuracy. An optical transmission system is mounted on the first substrate, and the MPD is mounted on the second substrate having an inclined surface provided on an opposite side of the recess in terms of the optical transmission direction. This eases production work and simultaneously allows the decreaseed use of expensive substrates.

Abstract: In a surface-mounted optical receiver module comprising a substrate, a photodiode serving as a light receiving device for converting an optical signal into an electrical signal, an optical waveguide serving as an optical transmission line for transmitting the optical signal to the photodiode, and an amplifier device for amplifying the electrical signals, the amplifier device is placed at a predetermined position on the upper surface of the optical waveguide element, which is on the same side as an optical waveguide (on the upstream side in the optical-signal transmitting direction) relative to the photodiode. This configuration eliminates the necessity of additionally securing a space to provide the amplifier device, whereby the size of the optical transmission module can be reduced, and this allows the optical receiver module to receive optical signals at high speed.

Abstract: 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.

Abstract: An optical module for inputting and outputting light in a direction of a predetermined axis, and a method of manufacturing the optical module are provided. The optical module includes a stem having a mount and a principal surface crossing the predetermined axis. The mount has a first mounting surface, a second mounting surface, and an optical path. An optical filter is attached to the mount. A semiconductor light emitting device emitting light of a first wavelength is disposed on the first mounting surface and is optically coupled to the optical filter. A semiconductor light receiving device being responsive to light of a second wavelength is positioned on the second mounting surface in alignment with the optical path and is optically coupled to the optical filter through the optical path, thereby receiving the light of the second wavelength from the optical filter.

Abstract: A standard multichannel optical fiber has a pitch 250 &mgr;m (P1), whereas mounting of optoelectronic device chips can require a pitch P2 larger than P1. The pitch of element fibers should be enlarged for coupling a multichannel ribbon fiber to a multichannel photodiode (PD) or laser diode (LD) module having photodiodes or laser diodes for M channels. The module includes a connector maintaining M fibers with tails extending backward and a bench having M V-grooves aligned at the larger pitch P2 for receiving the tails of the fibers. M light waveguides are aligned at the pitch P2 following the V-grooves. The module also includes M photodiodes or laser diodes following the light waveguides. A package includes the connector at a front part, the fiber tails at a width enlarging region for converging the pitch from P1 to P2, and the bench at a back part.

Abstract: 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.