摘要:
The invention relates to a device for coupling an optical fibre (31) and a nanophotonic component formed on a first substrate (33), wherein the device comprises: an intermediate component formed on a second substrate (35) including a first wave guide (37) adapted for receiving light from the optical fibre and for transmitting the same to a first diffraction grating (39) independently from the polarisation of the incident light; second and third diffraction gratings (45, 47) formed on the first substrate and coupled to the nanophotonic component, the first diffraction grating (39) being adapted to provide the first (41) and second (43) light beams respectively towards the second diffraction grating (45) and the third diffraction grating (47), the first and second beams having perpendicular polarisations.
摘要:
The illustrative embodiment of the invention is a integrated waveguide having low modal birefringence. The surface waveguide has a composite guiding region (106) that is sandwiched by a lower cladding layer (102) and an upper cladding layer (104), wherein the cladding layers serve to confine propagating light to the composite guiding region (106). In accordance with the illustrative embodiment, the composite guiding region is structured so that it exhibits a balanced stress configuration, which results in an integrated optical waveguide that exhibits very low birefringence. The composite guiding region consists of an outer core (208,212) and an inner core (210).
摘要:
A polarization splitting grating coupler (PSGC) (100) connects an optical signal from an optical element (105), such as a fiber, to an optoelectronic integrated circuit (101). The PSGC (100) separates a received optical signal into two orthogonal polarizations and directs the two polarizations to separate waveguides on an integrated circuit (101). Each of the two separated polarizations can then be processed, as needed for a particular application, by the integrated circuit (1 O 1). A PSGC (100) can also operate in the reverse direction, and couple two optical signals from an integrated circuit to two respective orthogonal polarizations of one optical output signal sent off chip to an optical fiber.
摘要:
A polarization coupler includes a stress-inducing feature disposed to generate a stress-field in a substrate. First and second waveguides each a have a coupling portion that pass through the stress-field. First and second periodic-structures are in optical communication with the coupling portions of the first and second waveguides.
摘要:
A polarizer is provided comprising a subwavelength optical microstructure wherein the microstructure is partially covered with a light-transmissive inhibiting surface for polarizing light. The inhibiting surface can include a reflective surface, such as a metalized coating. The subwavelength optical microstructure can include moth-eye structures, linear prisms, or modified structures thereof. A polarizing structure is further provided comprising a plurality of moth-eye structures stacked on one another for polarizing light.
摘要:
A filter device and method are presented for filtering a multi-channel randomly polarized light signal to separate therefrom at least one specific channel. The device comprises a polarizer assembly, and a filter structure. The polarizer assembly is operable for processing the multi-channel randomly polarized light signal to split it into two multi-channel light components of a predetermined polarization identical for both of said two multi-channel light components; and for processing two identically polarized light components to produce a randomly polarized light signal. The filter structure is operable to process said two multi-channel light components of said predetermined polarization to select from each of said two light components the specific channel, and thereby produce two first output light components of the specific channel propagating through spatially separated first light paths.
摘要:
The method consists of creating a compensating region within the slab waveguide region, with effective TE and TM mode refractive indices of the compensating region higher than those of the original slab waveguide. Such change in refractive indices is achieved by deposition of an over-layer on the compensating region.