Abstract: An optical device includes a first and a second splitting device. Each of the first and second splitting devices have respective first and second input ports, respective first and second output ports, and a respective transfer matrix. A first optical waveguide is optically coupled to the first output port of the first splitting device and the first input port of the second splitting device. A second optical waveguide is optically coupled to the second output port of the first splitting device and the second input port of the second splitting device. The first and second optical waveguides are configured to introduce a phase shift of ? radians to the optical radiation propagating through the first optical waveguide with respect to the optical radiation propagating through the second optical waveguide.

Abstract: An optical cavity structure for bending optical signals is provided. The optical cavity structure includes an input port for receiving input optical signals from a first waveguide. The optical cavity structure also includes an interconnecting structure that receives said input optical signals and interconnects said first waveguide to a second waveguide, the interconnecting structure further includes at least four straight edges that orthogonal and of a finite width. The optical cavity structure further includes an output port coupled to the interconnecting structure for providing the second waveguide with the input optical signals. Further, the optical cavity structure may be used to create three dimensional splitter devices and resonators.

Abstract: An AWG device includes a plurality of arrayed waveguides positioned close to each other. An input signal excites one of these coupled waveguides and the power is then transferred to all of the arrayed waveguides so there are enough degrees of freedom in the device to achieve any desired distribution.

Abstract: An integrated optic polarization converter includes a plurality of core layers used to approximate a gradually twisted waveguide and therein adiabatically transform a propagating mode from an initial polarization state to a different final polarization state.

Abstract: The present invention provides a micro-resonator including a plurality of waveguides forming optic junctions therebetween, with adjacent waveguides having different core permittivities and different cladding permittivities. Adjacent waveguides are mode-matched through adjustments of the core permittivities and the cladding permittivities of the waveguides to reduce or eliminate junction radiation, thereby providing high performance.

Abstract: An on-chip silicon-based optical coupler used to guide light from an optical fiber to a waveguide. The incoming wave is confined vertically by stacks of graded index materials. In the lateral direction, a linear taper formed by etched holes or trenches confines the wave.

Abstract: An AWG device includes a plurality of arrayed waveguides positioned close to each other. An input signal excites one of these coupled waveguides and the power is then transferred to all of the arrayed waveguides so there are enough degrees of freedom in the device to achieve any desired distribution.

Abstract: An array waveguide grating structure includes an input MMI that receives an input optical signal and splits the optical signal into a plurality of signals, each having a defined wavelength. A plurality of input arrayed waveguide structures receive the plurality of signals such that each of the waveguide structures receives one of the plurality of signals. The input MMI, the plurality of arrayed waveguide structures, and the output waveguide are configured using HIC optics.

Abstract: A PMD compensator or generator includes one module for adjusting first order PMD without altering second order PMD (FOnSO module), and another module for adjusting second order PMD without altering first order PMD (SOnFO module). The modules enable separate compensation of first and second order PMD. First order PMD can be measured and compensated in a feedforward manner, while second order PMD can be compensated in a feedback manner. Both first and second order PMD can be compensated in a feedforward manner. The modules also enable separate generation of first and second order PMD, and can be used in a completely deterministic manner to achieve the desired PMD.

Abstract: A PMD device includes a first stage that receives a signal and performs rotation about {1,0,0} on the signal. The first stage outputs a first signal. A second stage receives the first signal and performs a rotation about {0,0,1} on the first signal. The second stage outputs a second signal that represents the alignment the PMD of various frequencies into a common direction. A third stage receives the second signal and provides the necessary frequency dependent variable in the {1,0,0} direction to cancel the PMD in any specified frequency range.

Abstract: An integrated optic polarization converter includes a plurality of core layers used to approximate a gradually twisted waveguide and therein adiabatically transform a propagating mode from an initial polarization state to a different final polarization state.

Abstract: An optical device includes a first and a second splitting device. Each of the first and second splitting devices have respective first and second input ports, respective first and second output ports, and a respective transfer matrix. A first optical waveguide is optically coupled to the first output port of the first splitting device and the first input port of the second splitting device. A second optical waveguide is optically coupled to the second output port of the first splitting device and the second input port of the second splitting device. The first and second optical waveguides are configured to introduce a phase shift of ? radians to the optical radiation propagating through the first optical waveguide with respect to the optical radiation propagating through the second optical waveguide.

Abstract: An optical switch includes at least two signal bus waveguides that receive optical signals as input. At least two directional couplers are positioned so that the inputs to the at least two directional couplers are not switched relative to each other.

Abstract: An add-filter device includes a plurality of ring resonators that are arranged to receive an optical signal of a specific wavelength and channel to be added onto a bus line that is arranged to receive a plurality of signals. At least one Mach-Zehnder Interferometer (MZI) structures embedded in the plurality of ring resonators. The at least one MZI structure and ring resonators provide the necessary modulation and filtering so that the optical signal can be added to the bus line without affecting the channels contained in the bus line.

Abstract: An optical filter includes at least one ring resonator that receives as input an optical signal having a plurality of channels from an input optical source. At least one Mach-Zehnder module is nested in the at least one ring resonator. The at least one Mach-Zehnder module and the at least one ring resonator filter at least one selective channel from the optical signal.

Abstract: A PMD device includes a first stage that receives a signal and performs rotation about {1,0,0} on the signal. The first stage outputs a first signal. A second stage receives the first signal and performs a rotation about {0,0,1 } on the first signal. The second stage outputs a second signal that represents the alignment the PMD of various frequencies into a common direction. A third stage receives the second signal and provides the necessary frequency dependent variable in the {1,0,0} direction to cancel the PMD in any specified frequency range.

Abstract: A real-time optical compensating apparatus reduces the PMD in an optical fiber by determining the principal states of polarization of the optical fiber and delaying one principal state of polarization with respect to the other.

Abstract: A method and apparatus are provided for generating short (e.g., picosecond) pulses using a 2 section 1553 nm DBR laser without gain switching nor external modulation. The center wavelength of the DBR section is modulated at 0.5 GHz to generate a constant amplitude frequency modulated optical wave Large group velocity dispersion is then applied with a chirped fiber Bragg grating to convert the FM signal to a pulse stream.

Abstract: A system includes a plurality of AWGs, wherein one of the AWGs receives an input signal. The AWGS are divided amongst a first selective group of the AWGs providing even-numbered channel outputs associated with an even-numbered selection of the input signal, and a second selective group of the AWGs providing odd-numbered channel outputs associated with an odd-numbered selection of the input signal. An interleaver arrangement includes a plurality of ring structures so as to provide appropriate filtering characteristics for the even-numbered channel outputs and odd-numbered channel outputs.

Abstract: Systems and methods for enhancing the stability of a mode-locked laser's output are disclosed. The laser systems include a mode-locking element that mode-locks the laser's output, and a semiconductor element. The semiconductor element produces a loss at the laser's operative wavelength that increases as pulse energy increases, thereby enhancing the stability of the mode-locked output. The semiconductor elements can be used to enhance stability of both passively and actively mode-locked laser systems.