Abstract:
An optical or free space isolator (150-150"), and optical or optoelectronic transmitter and methods of transmitting an optical signal and making the transmitter are disclosed. The optical or free space isolator (150-150") includes a first and polarizer (152), configured to polarize light at a first polarization angle and block light at a second polarization angle; a Faraday rotator (154), configured to rotate the light polarized by the first polarizer (152) by a predetermined degrees, a second polarizer (156) in a light path passing through the first polarizer (152) and the Faraday rotator (154), on a side of the Faraday rotator (154) opposite from the first polarizer (152), configured to polarize light at a third polarization angle; and a half wave plate (155) in the light path, having a predetermined orientation angle. The first polarizer (152), Faraday rotator (154)/isolator and half wave plate (155) have respective polarization, rotation and orientation values that allow light to pass through the optical isolator in a first direction, and block reflected light traveling through the optical isolator along a second direction opposite to the first direction.
Abstract:
Exemplary apparatus and method can be availed for providing at least one electromagnetic radiation. For example, it is possible to provide at least one first electromagnetic radiation having a frequency that changes over time with a first characteristic period. Further, with at least one hardware arrangement, it is possible to receive and modify the first electromagnetic radiation(s) into at least one second electromagnetic radiation having a frequency that changes over time with a second characteristic period. The second characteristic period can be smaller than the first characteristic period. The hardware arrangement(s) can include a resonant cavity having a round-trip propagation time for the first electromagnetic radiation(s) that can be approximately the same as the first characteristic period.
Abstract:
Fiber lasers for producing Band I wavelengths include a laser cavity having an optical fiber with specific parameters in length and thickness and doping concentration, and having high reflectivities. Examples show the feasibility of producing such fiber lasers. Fiber lasers for producing Band IV wavelengths include a depolarized laser oscillator, at least one amplifier and a polarizer. Depolarized laser oscillator is an inherently depolarized CW laser, or a depolarized laser diode, which is depolarized by a depolarizer. Additional fiber lasers in accordance with embodiments of the present invention include a double clad active optical fiber having a pump power entry point for sending pump energy through the active optical fiber in a first direction, and a loop portion at a second end of the fiber for sending pump energy through the active optical fiber in a second direction which is opposite to the first direction. A system for coupling light into a fiber in accordance with embodiments of the present invention include a first fiber, a second double clad fiber, and a bulk optic component positioned between the first and second fibers. A mode stripper included within the second fiber allows for removal of high power light which is propagated through the outer clad rather than launched into the core of the second fiber.
Abstract:
The invention relates to a polarization maintaining optical delay circuit (1) for providing a time delay to an incident light (Sl), comprising an optical directional element (11) adapted for directing an incident light (Sl) from a first port (111) to a second port (112) and directing a returning light from the second port to a third port (113), a mirror element (12) adapted for reflecting the incident light (Sl), thereby changing the polarization state, so that the returning light (S2) has a substantially orthogonal polarization state compared to the polarization state of the incident light (Sl) , and an optical waveguide (13) adapted for optically connecting the second port (112) of the optical directional element (11) and the mirror element (12). The invention also relates to a ring cavity (2,3) comprising such an optical delay circuit, and an optical interferometer (4,5) with said optical delay circuit.
Abstract:
An optical apparatus comprises a substrate, first and second transmission optical elements on the substrate, and an optical component (such as an isolator) and focusing optical element(s) on the substrate between the transmission elements. Transmission elements may include planar waveguide(s) formed on the substrate and/or optical fiber(s) mounted in groove(s) on the substrate. The focusing element(s) may include: gradient-index (GRIN) segment(s) mounted on the substrate or spliced onto a fiber, a focusing segment(s) of a planar waveguide, ball lens(es), aspheric lens(es), and/or Fresnel lens(es). A dual-lens optical assembly comprises a pair of GRIN segments secured to a substrate in one or more grooves, and may be formed from a common length of GRIN optical medium. An optical component (such as an isolator) is positioned between the paired GRIN segments, and optical power is transmitted by the dual-lens assembly between planar waveguide(s) and/or fiber(s) through the optical component.
Abstract:
L'invention se rapporte à un procédé et à un dispositif de positionnement d'un composant optique entre deux fibres optiques munies à leur extrémité de lentilles (3, 4). Le procédé consiste à: percer un support (6) de façon à y fixer un tube capillaire (7) dont le diamètre intérieur est prévu pour y glisser une fibre optique, fixer le tube capillaire (7) dans le perçage (8) du support (6), réaliser une découpe (10) borgne du support (6) et du tube capillaire (7), de façon à séparer le tube capillaire (7) en deux parties (7a, 7b), une première face plane (11) de la découpe (10) étant perpendiculaire à un axe (5) longitudinal du tube capillaire (7), positionner le composant (12) sur la première face plane (11), positionner une fibre optique (1, 2) dans chacune des parties (7a, 7b). Le dispositif comporte un support au travers duquel est fixé un tube capillaire (7), le support (6) comportant une découpe (10) de façon à séparer le tube capillaire (7) en deux parties (7a, 7b). La découpe (10) comporte une première face plane (11) perpendiculaire à un axe (5) longitudinal du tube capillaire (7). Le composant est positionné sur la première face plane (11).
Abstract:
An exemplary optical isolator (60), which may use a magnetic-composite material (48), and method for making the same are provided. The optical isolator (60) may include a core (42), a cladding (44), and a magnetic-composite material (48). The cladding (44) is positioned relative the core (42) and includes a thinned segment (46) of the cladding (44) with a cladding thickness operable to allow an optical field penetration through the thinned segment (46) of the cladding (44) by a light wave that propagates either in the positive or negative propagation direction. The magnetic-composite material (48) is provided in the presence of a magnetic field, such as a static magnetic field, in a direction perpendicular to the positive propagation direction of the core (42), and is positioned relative the thinned segment (46) to receive the optical field penetration through the thinned segment (46).