Abstract: An optical wavelength control system for an optical source includes a beamsplitter arrangement for propagating radiation from the source over two paths. First and second photodetectors are arranged each in a respective one of said two propagation paths, while a wavelength selective optical filter is interposed in the propagation path from the source to the first photodetector. The first and second photodetectors generate photocurrents indicative of the possible displacement of the actual wavelength of the radiation from said source with respect to a reference wavelength and the power emitted by the optical source, respectively. The system includes a support bench extending in a given plane and the beamsplitter arrangement is arranged to split the radiation from said source towards the photodetectors in a direction substantially perpendicular to the given plane of the support bench.

Abstract: An optical wavelength control system for an optical source, includes: a beam splitter arrangement for propagating radiation from the source over two paths, first and second photodetectors, each arranged at a respective one of the two propagation paths, a wavelength selective optical filter affecting propagation of said radiation over the propagation path to the first photodetector, whereby the first and second photodetectors are adapted to generate photocurrents indicative of the possible displacement of the actual wavelength of the radiation from the source with respect to a reference wavelength and the power emitted by the optical source, respectively. The wavelength selective optical filter is e.g. an interference filter or an etalon filter arranged to receive reflected radiation from the beam splitter arrangement.

Abstract: A substantially planar substrate (10), typically constituting a part of a hybrid electro-optical device, has a portion (12) defining a mounting location for optoelectronic components (14) such as laser sources, photodetector diodes, LEDs, requiring local hermetic protection of the bare chips. A planar lightwave circuit (PLC) waveguide structure formed on the substrate (10) extends to the mounting location (12) to define an optical signal feed-through for the device. At least one electrode (20) is associated with the planar lightwave circuit waveguide structure (18) and extends said mounting location (12) to define an electrical signal feed-through for the device (14). A ring-like structure (26) continuously surrounds said mounting location (12). The ring-like structure (26) is hermetic with respect to the planar substrate (12), and a continuous cover member (28) is arranged to cover the mounting location (12) and having a peripheral rim portion (32) co-extensive with the ring-like structure (26).

Abstract: An optical wavelength control system for an optical source (LD) such as a laser diode in a DWDM transmitter module includes a beamsplitter arrangement (9, 10; 12) for propagating radiation from the source (LD) over two paths. A first (1) and a second (2) photodetector are arranged each in a respective one of said two propagation paths, while a wavelength selective optical filter (3) is interposed in the propagation path from the source (LD) to the first photodetector (1). The first (1) and second (2) photodetectors are thus adapted to generate photocurrents indicative of the possible displacement of the actual wavelength of the radiation from said source (LD) with respect to a reference wavelength and the power emitted by the optical source, respectively.

Abstract: An arrangement for monitoring the main radiation beam emitted by an optical source such as a laser diode (10) having a nominal emission wavelength, includes first (18) and second (20) photodetectors as well as a wavelength selective element (22). A beam splitter module (16) is provided for splitting a secondary beam from the main radiation beam of the laser source and directing it towards the first (18) photodetector via the associated wavelength selective element (22). The wavelength selective element (22) has a wavelength selective transmittance-reflectance characteristic, whereby said secondary beam is partly propagated towards said first (18) photodetector and partly reflected from said wavelength selective element (22) towards the second (20) photodetector. The output signals (18a, 20a) from the photodiodes (18, 20) have intensities whose behaviours as a function of wavelength are complementary to each other.

Abstract: A device for monitoring the emission wavelength of a laser includes a semiconductor slice or slab having first and second opposed surfaces. The semiconductor slice is exposed to the radiation at an angle such that a portion of said radiation impinges onto the first surface at angles in the vicinity of the Brewster angle for the first surface. The radiation is thus refracted into the semiconductor slice and caused to propagate towards the second surface of the semiconductor slice. A wavelength selective filter is arranged at said second surface having associated a photodetector to generate a signal indicative of the wavelength of the radiation.

Abstract: A device for monitoring the emission wavelength of a laser (10) includes a semiconductor slice or slab (14) having first (141) and second (142) opposed surfaces. The semiconductor slice (14) is exposed to the radiation at an angle such that a portion of said radiation impinges onto the first surface (141) at angles in the vicinity of the Brewster angle for the first surface (141). The radiation is thus refracted into the semiconductor slice (14) and caused to propagate towards the second surface (142) of the semiconductor slice (14). A wavelength selective filter (15) is arranged at said second surface (142) having associated a photodetector (11) to generate a signal (110) indicative of the wavelength of the radiation.

Abstract: In the fiber and in any fiber (F), a reflecting surface (F1) is created that is generically tilted with respect to the main propagation path (T1) of the optical radiation in said fiber, so as to originate by reflection an additional propagation path (T2) that is generically deflected with respect to said main propagation path (T1). In a mounting support (2) common to the fiber (F) and the related opto-electronic component (O), a groove is made along an external face (2a) so as to accomodate the optical fiber (F) in a tight condition. The groove (3) is then covered through a laminar cover, that is transparent to the radiation and has a flat surface (4a). The fiber (F) is inserted into said groove in order that said deflected propagation path (T2) passes through said cover (4) of material transparent to the radiation, and the opto-electronic component (O) is mounted on said cover (4) in alignment with said deflected propagation path (T2).

Abstract: Transmitter module for optical interconnections, comprising a metal container housing an optical emitting device, an integrated circuit containing the driving circuit of the emitting device and an optical fibre extending outside the container, the emitting device being mounted on a metallic ground area realized on the integrated circuit. The cathode is electrically connected to the ground area and the anode is connected to a second metal area, connected with the output of the driving circuit. The module uses a type of assembly which minimises problems due to the length of the connecting wires, to parasitic effects and to the effects of signal reflections due to impedance mismatching. It also requires reduced power for its operation and it is provided with a structure facilitating dissipation.