Abstract:
A truncated series-based cavity interferometer contains a multi-reflection cavity upon which an input light beam is directed at an acute angle, to produce a spatially spread series of multiple order beams through which the transfer function (e.g., a generally square pass/stop profile) of the interferometer is defined. Because the input beam is incident upon the cavity at an acute angle, it is non counter-propagating with respect to the reflected beam, so that no circulator is required for beam separation. The intensity profile of the energy contained in the composite set of spatially separated multiple order beams comprises a spatially separated decaying series of reflections, that are intercepted by independently positionable spatial filter elements.
Abstract:
An optical attenuator has a planar MEMS substrate supporting two optical fibers; an actuator; and a silicon vane actuatable by said actuator for a movement into and out of the optical beam passed between the fibers. The vane is configured to divert at least a portion of the optical beam off the optical axis when the element is moved into the optical beam. The vane has at least one surface disposed non-perpendicularly relative to the optical axis of the beam. The vane may be of a wedged shape.
Abstract:
Optical performance monitoring device for monitoring and analyzing an optical signal has a periodically movable reflective mirror to receive an input optical beam and to cyclically nullscannull (deflect) the beam in a one-dimensional direction. The deflected beam at a varying deflection angle is directed to a linear variable filter (LVF) that passes a selected wavelength channel of the deflected beam in dependence upon the deflection angle. The selected channel is then passed to a photodetector via a focusing lens, typically a cylindrical lens. The device is durable, tunable, offers low loss, good wavelength registrability and spectral resolution.
Abstract:
A waveguide device for optical amplification and light amplification by stimulated emission radiation comprises an optical medium formed from a bulk glass. The optical medium is fused to a planar substrate to form a lower cladding. The bulk glass is subsequently thinned, patterned and coated with an upper cladding to form waveguide channels with sufficient mode confinement and mode field dimension compatible with direct coupling to optical fibers to achieve low insertion loss and a reduced polarization dependent loss, while obviating the need for critical fiber alignment using lensed or tapered fibers. The bulk glass is preferably an Er-doped or ErnullYb co-doped bulk glass, which when fused to quartz, or other low refractive index glass or cladding, provides a gain region less than about 5 cm long that is strongly index-guided to better confine the pump beam, and in the case of an amplifier, the signal beam.
Abstract:
The invention relates to optical modules for use in larger electro-optic components, such as erbium doped fiber amplifiers. One aspect of the invention relates to the optical module including input and/or output fiber tube ferrules surrounded by glass mounting sleeves secured to a metal housing using a suitable adhesive. Preferably, the optical module includes one or more optical elements, such as isolators, WDM filters and beam splitters, for effecting light traveling therethrough before entering or exiting a main housing of the electro-optic component. Another aspect of the invention relates to the electro-optic component including the main housing with gaps in the outer wall thereof for receiving the optical modules. Preferably, the optical component includes an electro-optical system including lasers, erbium doped fiber, an integrated circuit board and controller hardware. The present invention provides a fully integrated system, while eliminating the vast majority of optical splicing required in conventional electro-optical components.
Abstract:
A tunable PM fiber combiner is configured to be accurately alignable with and operative to combine into a single composite beam a pair of non-collimated, orthogonally polarized light beams transported over polarization maintaining (PM) optical fibers, whose mutual spatial separation may vary. The combiner includes birefringent elements, that are linearly or rotationally displaced to realize the composite beam. The resulting composite light beam may then be readily coupled (e.g. via a single mode fiber) to a downstream beam processing device, such as a Raman amplifier.