摘要:
An optical apparatus is provided that includes a first arrayed waveguide or Mach-Zehnder frequency routing device (10) having at least one input port (2) and P output ports, where P ≥ 2. A second frequency routing device (12) is also provided that has P input ports and at least one output port (4). P optical paths (14₁,14₂,...14 p ) couple the input port of the first frequency routing device to the output port of the second frequency routing device. To obtain a wide and flat passband the two frequency routers are combined in a way to compensate the respective wavelength shifts for each optical path. The transmission coefficients for the optical paths (14); between the routers equal to unity at distinct optical wavelengths and equal to half unity halfway between these distinct wavelengths.
摘要:
The present invention relates to an optical apparatus that includes a first plurality of waveguides and a first free space region connected to the first plurality of waveguides: A second plurality of waveguides is connected to the first free space region. An optical grating is connected to the second plurality of waveguides and includes a plurality of unequal length waveguides. A third plurality of waveguides is connected to the optical grating and a second free space region is connected to the third plurality of waveguides. At least one waveguide is connected to the second free space region. The first plurality of waveguides includes at least two adjacent waveguides having ends remote from the first free space region. A Y-branch coupler connected to the remote ends of the two adjacent waveguides. The adjacent waveguides are located a predetermined distance apart along the first free space region to produce a specifiable passband width.
摘要:
A monolithically integrated laser which is rapidly tunable over a wide optical frequency range comprises a frequency router formed in a semiconductive wafer defining a tuned cavity. A control circuit applies electrical energy to predetermined controllably transmissive waveguides connecting the frequency routing device with reflective elements defined in the wafer. This tunes the laser to a desired one of a plurality of optical frequencies. Application of such electrical energy creates frequency selective pathways through the wafer able to support selected lasing frequencies. This laser is economical to construct and is useful in high capacity, high speed optical communications networks.
摘要:
A waveguide array comprising a plurality of waveguides which are each outwardly tapered at the aperture of the my in accordance with a predetermined criteria chosen to increase waveguide efficiency. Thc tapering serves to gradually transform a fundamental Bloch mode, propagating through the waveguide array, into a plane wave in a predetermined direction, and then to launch the plane wave into free space in the predetermined direction. In another embodiment, the waveguides are positioned relative to one another in order to satisfy the predetermined criteria.