Patent application number | Description | Published |
20080246106 | Integrated circuits having photonic interconnect layers and methods for fabricating same - Various embodiments of the present invention are directed to integrated circuits having photonic interconnect layers and methods for fabricating the integrated circuits. In one embodiment of the present invention, an integrated circuit comprises an electronic device layer and one or more photonic interconnect layers. The electronic device layer includes one or more electronic devices, and the electronic device layer is attached to a surface of an intermediate layer. One of the photonic interconnect layers is attached to an opposing surface of the intermediate layer, and each of the photonic interconnect layers has at least one photonic device in communication with at least one of the electronic devices of the electronic device layer. | 10-09-2008 |
20080310790 | Nanowire-based photodetectors - Various embodiments of the present invention are directed to nanowire-based photodetectors that can be used to convert information encoded in a channel of electromagnetic radiation into a photocurrent encoding the same information. In one embodiment of the present invention, a photodetector comprises a waveguide configured to transmit one or more channels of electromagnetic radiation. The photodetector includes a first terminal and a second terminal. The first terminal and the second terminal are positioned on opposite sides of the waveguide. The photodetector also includes a number of nanowires. Each nanowire interconnects the first terminal to the second terminal and a portion of each nanowire is embedded in the waveguide. | 12-18-2008 |
20090220191 | PHOTONIC INTEGRATED CIRCUIT EMPLOYING OPTICAL DEVICES ON DIFFERENT CRYSTAL DIRECTIONS - Consistent with the present disclosure, various optical components are preferably arranged on the surface of a semiconductor substrate such that light propagates in certain components at a direction that is perpendicular to a direction of propagation in other components in order to improve performance and component density. | 09-03-2009 |
20090220235 | THREE-ARM DQPSK MODULATOR - A modulator is disclosed that includes three arms between a splitter portion and a coupler portion. The modulator typically requires at most a π/2 phase shift between constellation points. Accordingly, the modulator is more efficient and consumes less power. | 09-03-2009 |
20100254420 | PHOTONIC INTEGRATED CIRCUIT HAVING VARIABLE LENGTH MACH-ZEHNDER MODULATORS - A photonic integrated circuit (PIC) having multiple Mach-Zehnder (MZ) modulators with different lengths is provided. The modulator lengths are selected to provide optimal performance for each optical path provided on the PIC. | 10-07-2010 |
20100290735 | PHOTONIC INTEGRATED CIRCUIT HAVING BENT ACTIVE COMPONENTS - Consistent with the present disclosure, the number of passive waveguides in a PIC are reduced by directly connecting active components to one another. Accordingly, optical signals propagating in the PIC may experience less loss, and, thus, improved performance may be achieved. In addition, active components may be bent or curved in order to obtain a more compact layout with greater device density. Reduced manufacturing costs can therefore be realized. | 11-18-2010 |
20110147874 | PHOTODIODE ISOLATION IN A PHOTONIC INTEGRATED CIRCUIT - Consistent with the present disclosure, a current blocking layer is provided between output waveguides carrying light to be sensed by the photodiodes in a balanced photodetector, and the photodiodes themselves. Preferably, the photodiodes are provided above the waveguides and sense light through evanescently coupling with the waveguides. In addition, the current blocking layer may include alternating p and n-type conductivity layers, such that, between adjacent ones of such layers, a reverse biased pn-junction is formed. The pn-junctions, therefore, limit the amount of current flowing from one photodiode of the balanced detector to the other, thereby improving performance. | 06-23-2011 |
20110243175 | SEGMENTED DISTRIBUTED FEEDBACK LASER - The present invention provides for a semiconductor laser having a narrow linewidth and low power consumption for optical communication applications. According to various embodiments of the invention, a semiconductor laser is provided which includes a grating layer comprising a plurality of segmented gratings, each including a non-grating portion and a grating portion. The segmented gratings are configured to enhance a fundamental mode of the semiconductor laser while sufficiently suppressing modes other than the fundamental mode, providing a narrow linewidth for example. The segmented gratings are also configured to provide an effective length longer than an actual length of the semiconductor laser, leading to smaller device areas and corresponding lower power consumption. A photonic integrated circuit is also provided which includes a plurality of semiconductor lasers, consistent with the present invention, as well as additional optical elements, all provided on a single substrate. | 10-06-2011 |
20120002912 | FABRICATION TOLERANT POLARIZATION CONVERTER - The present invention provides a polarization converter, and a method for fabricating the same. The polarization converter includes a geometric shape which induces rotation of a polarization of an optical signal from a first polarization state to a second polarization state as the optical signal propagates along the polarization converter. The performance of the polarization converter is maintained in light of inconsistencies in fabrication processes resulting in improved manufacturability. | 01-05-2012 |
20130170782 | MACH-ZEHNDER INTERFEROMETER HAVING BENDED WAVEGUIDES - Consistent with the present disclosure, both arms of an MZ interferometer are “double-folded” and are bent in at least two locations to define first and second acute inner angles. Accordingly, the arms of the MZ interferometer may have substantially the same length, and, further, the MZ interferometer has a more compact geometry. In one example, the arms parallel each other and have a serpentine shape, and, in a further embodiment, the arms parallel one another and have a Z-shape. Accordingly, since the temperature of a PIC upon which the MZ interferometer is provided does not vary significantly over such short distances, the temperatures of both arms is substantially the same. | 07-04-2013 |
20130170783 | MACH-ZEHNDER HAVING SEGMENTED DRIVE SIGNAL ELECTRODES - Consistent with the present disclosure, MZ drive signal electrodes may be provided relatively close to and parallel to one another, such that the underlying waveguide arms may also be provided close to and parallel to one another. As a result, common mode performance of an MZ modulator may be obtained. In one example, an electrode wiring configuration consistent with the present disclosure may permit a waveguide arm separation of 40 microns or less. | 07-04-2013 |
20130279910 | Banded Semiconductor Optical Amplifier - A semiconductor optical amplifier module may include a beam splitter to split an optical signal into two polarization optical signals including a first polarization optical signal with a Transverse Magnetic (TM) polarization provided along a first path of two paths, and a second polarization optical signal with a Transverse Electric (TE) polarization provided along a second path of the two paths; a first rotator to rotate the TM polarization of the first polarization optical signal to TE polarization; a first semiconductor optical amplifier to amplify the rotated first polarization optical signal to output a first resultant optical signal; a second semiconductor optical amplifier to amplify the second polarization optical signal; and a second rotator to rotate the polarization of the amplified second polarization optical signal to output a second resultant optical signal; and a beam combiner to combine the first resultant optical signal and the second resultant optical signal. | 10-24-2013 |
20130279911 | RAMAN PUMP CIRCUIT - A Raman pump may include a dual output laser configured to output two optical signals; a delay interferometer configured to delay a first of the two optical signals to decorrelate the two optical signals from each other; and a combiner configured to combine the delayed first of the two optical signals and a second of the two optical signals to provide a Raman amplification signal. | 10-24-2013 |
20140016894 | SUPPRESSION OF RESONANT POLARIZATION CONVERSION IN PHOTONIC INTEGRATED CIRCUITS - A device may include a number of optical waveguides, each of which being spaced from one another. The optical waveguides may each include at least one curved section and widths of the curved sections of the optical waveguides may be selected to reduce polarization conversion of light traversing the birefringent optical waveguides. | 01-16-2014 |