Abstract:
Improved passive optical coupling to photonic integrated circuit (PIC) chips is provided. An interposer unit (108) having one or more flexible optical waveguide members (112, 114, 116) is employed. The flexible optical waveguide members are coupled to the PIC chip (118) via their tips. The PIC chip includes alignment features to facilitate lateral, vertical and longitudinal passive alignment of the flexible optical waveguide members to on-chip optical waveguides of the PIC.
Abstract:
A multi-mode optical waveguide device is formed from a plurality of periodically structured waveguides, where each waveguide is configured to guide a carrier signal comprising one spatial mode of a plurality of spatial modes and has at least one segment of each waveguide with a waveguide width that periodically changes along a waveguide path to induce coupling between pairs of spatial modes. In some embodiments, the at least one segment is disposed at a location along the waveguide path at which maximal mode overlap occurs. The waveguide device may be used as for space-division multiplexing and as an optical switch.
Abstract:
The invention concerns a Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and comprises a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region comprises a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF comprises hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further comprises a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50 °C, preferably 50 °C
Abstract:
A polarization splitter and rotator device (500) includes an optical mode converter (501) comprising a first optical waveguide (511), wherein a core (515, 517a, 517b) of the first optical waveguide (511) is asymmetrically shaped provoking polarized light coupled into the first optical waveguide (511) to exchange its transverse magnetic mode of zeroth order (TM0) to a transverse electric mode of first order (TE0) while leaving its transverse electric mode of zeroth order (TE0) unchanged; and an output coupler (503) comprising a second optical waveguide (512) coupled to the first optical waveguide (511) and a third optical waveguide (513) adiabatically coupled to the second optical waveguide (512), the adiabatically coupling provoking the polarized light coupled from the first optical waveguide (511) into the second optical waveguide (512) to spread its power between the second optical waveguide (512) and the third optical waveguide (513) by coupling its transverse electric mode of first order (TE1) as transverse electric mode of zeroth order (TE0) into the third optical waveguide (513) and keeping its transverse electric mode of zeroth order (TE0) propagating in the second optical waveguide (512) without coupling to the third optical waveguide (513).
Abstract:
The invention concerns a method for characterizing mode group properties of multimodal light traveling through an optical component, comprising: - providing a Mode Group Separating optical fiber in an optical path between a light source and said optical components - launching reference pulses of light with a wavelength λt from said light source through said Mode Group Separating optical fiber into said optical component at discrete intervals between a core center and a core radius of said fiber. The Mode Group Separating optical fiber is a multimode fiber with an a-profile graded index core with an α-value chosen such that said fiber satisfies the following criterion at the wavelength λt : formula (I) where: - Δ Ƭ is a time delay difference between consecutive mode groups; - L is a length of said fiber; - Δ T REF is a Full Width at Quarter Maximum of said reference pulses.
Abstract:
One aspect of the invention provides a method of fabricating a mode size converter. The method includes: exposing a photoresist-coated substrate (S506) to varying doses of light exposure to produce a profile in the photoresist of a beam mode size converter; and etching the photoresist-coated substrate (S510) to remove an equal thickness of the photoresist and substrate. The beam mode sized converter includes: a first surface having a first surface height and a first surface width; a second surface opposite the first surface, the second surface having a second surface height different than the first surface height and a second surface width different than the first surface width; and one or more boundary surfaces connecting the first surface and second surfaces.