Finisar Patent Grants

Transmission lines

Granted: June 20, 2017
Patent Number: 9686856
A circuit may include a first transmission line that includes a first first-line conductor configured to transport a signal and a second first-line conductor. The circuit may also include a second transmission line that includes a first second-line conductor, a second second-line conductor electrically coupled to the second first-line conductor, and a third second-line conductor separated from and positioned between the first and second second-line conductors. The third second-line…

Capacitors for multilayer printed circuit boards

Granted: June 20, 2017
Patent Number: 9686862
A capacitor in a multilayer printed circuit board is described. The capacitor may include a via of a via-in-pad type and a dielectric mixture filled in the via of the via-in-pad type. The via may be disposed under an integrated circuit contact pad of the multilayer printed circuit board. The dielectric mixture may include a nanoparticle-sized dielectric powder mixed with an adhesive material.

Local buffers in a liquid crystal on silicon chip

Granted: June 13, 2017
Patent Number: 9681207
An example embodiment includes a liquid crystal on silicon (LCOS) system. The LCOS system includes multiple pixels, a pixel voltage supply source (voltage source), an external buffer, and a local buffer. The voltage source is configured to supply an analog ramp to the pixels. The external buffer is configured to buffer the voltage source from the pixels. The local buffer is configured to buffer the external buffer from a subset of pixels of the plurality of pixels.

Optical cell with wavelength compensator

Granted: June 6, 2017
Patent Number: 9671611
An optical cell may include a first port coupled to a second port by an optical path. The optical cell may also include a compensator disposed in the optical path. The compensator may be rotatable about an axis. Rotating the compensator about the axis may vary a distance that the optical path passes through the compensator thereby changing the optical path length of the optical path.

Driver circuit

Granted: June 6, 2017
Patent Number: 9673815
A circuit may include first and second input nodes, first and second output nodes, first and second intermediate nodes, first and second resistances, a first amplification transistor coupled to the first input node, the first resistance, and the first intermediate node and a second amplification transistor coupled to the second input node, the second resistance, and the second intermediate node. The circuit may also include a first active device coupled to the first output node and the…

Reinforced optical fiber cable

Granted: May 23, 2017
Patent Number: 9658408
An optical fiber cable may include an optical fiber that extends from a first end to a second end. The optical fiber may include a core that extends from the first end to the second end, a cladding that surrounds the core and extends from the first end to the second end, and a coating that surrounds the cladding and extends from the first end to the second end. A first length of flexible epoxy may surround a length of the coating from the first end to a first intermediate point of the…

Method and apparatus for characterization and compensation of optical impairments in InP-based optical transmitter

Granted: May 16, 2017
Patent Number: 9654226
A method and apparatus for characterizing and compensating optical impairments in an optical transmitter includes operating an optical transmitter comprising a first and second parent MZ, each comprising a plurality of child MZ modulators that are biased at respective initial operating points. An electro-optic RF transfer function is generated for each of the plurality of child MZ modulators. Curve fitting parameters are determined for each of the plurality of electro-optic RF transfer…

Polarization diverse wavelength selective switch

Granted: May 16, 2017
Patent Number: 9654848
Described herein is a wavelength selective switch (WSS) type optical switching device (1) configured for switching input optical beams from input optical fiber ports (3, 5 and 7) to an output optical fiber port (9). Device (1) includes a wavelength dispersive grism element (13) for spatially dispersing the individual wavelength channels from an input optical beam in the direction of a second axis (y-axis). The optical beams propagate from input ports (3, 5 and 7) in a forward direction…

Optical circulators integrated into transceivers

Granted: April 18, 2017
Patent Number: 9625650
An optical circulator integrated into a transceiver for bi-directional communication may include a core configured to pass a transmission signal in a transmit direction and a received signal in a receive direction. The optical circulator may include an input port optically coupled to the core. The input port may be configured to deliver the transmission signal to the core. The optical circulator may include an output port optically coupled to the core. The output port may be configured…

Data communication using multiple channels

Granted: April 18, 2017
Patent Number: 9628216
A method of transmitting data may include receiving feedback information that includes effective channel bandwidths, signal-to-noise ratios (SNRs) associated with multiple optical channels on an optical link, and individual SNRs associated with subcarriers on each optical channel. The method may include determining multiple subcarrier power allocation schemes based on the feedback information. Each subcarrier power allocation scheme may be associated with a corresponding optical channel…

Partially etched phase-transforming optical element

Granted: April 11, 2017
Patent Number: 9618664
An optical element (transmissive or reflective) includes a transmissive layer comprising two different optical media arranged among discrete volumes arranged along the layer. The discrete volumes are arranged to approximate a desired phase function (typically modulo 2?) and are smaller than an operational wavelength in order to provide a range of phase delays needed to adequately approximate the desired phase function.

Multiplexer/demultiplexer based on diffractive optical elements

Granted: April 11, 2017
Patent Number: 9618708
A first transmissive diffraction grating includes a multiplexed transmission region; a second diffraction grating includes multiple demultiplexed transmission regions that are spatially displaced from one another and characterized by average corresponding grating-normal vector direction, grating wavevector magnitude, and grating wavevector direction. The demultiplexed transmission regions differ with respect to at least one of those parameters. The gratings are arranged such that each…

Multi-channel optoelectronic subassemblies

Granted: April 4, 2017
Patent Number: 9612414
This disclosure generally relates to devices and methods involving optoelectronic subassemblies. In some aspects, the disclosed devices and methods may relate to a multi-channel optoelectronic subassembly including a multi-channel header subassembly with a plurality of optoelectronic transducers on a substrate, a housing defining a housing cavity and including an optically transmissive portion, a ferrule assembly retaining optical fibers and an alignment sleeve with a sleeve cavity sized…

Differential TWE MZM driver for silicon photonics

Granted: March 28, 2017
Patent Number: 9606416
A differential TWE MZM includes a differential driver, first and second capacitors, and first and second terminations. The differential driver includes a first differential output and a second differential output that collectively form a differential pair. The first differential output is DC coupled to a first arm optical phase shifter of a TWE MZM. The second differential output is DC coupled to a second arm optical phase shifter of the TWE MZM. The first capacitor AC couples the second…

Blind equalization tap coefficient adaptation in optical systems

Granted: March 14, 2017
Patent Number: 9596104
A method of blind tap coefficient adaptation includes receiving a digital data signal including random digital data, equalizing a first portion of the digital data signal using a first set of predetermined tap coefficients and a second portion of the digital data signal using a second set of predetermined tap coefficients. The method includes generating a first eye diagram and a second eye diagram from a first portion and a second portion of an equalized signal, respectively. The first…

Clock recovery and equalizer estimation in a multi-channel receiver

Granted: March 7, 2017
Patent Number: 9590799
A method of performing clock recovery and equalizer coefficient estimation in a multi-channel receiver may include recovering, at a first clock recovery unit, a first clock signal associated with a first channel. The method may include estimating a first set of coefficients for a first equalizer associated with the first channel using the first clock signal. The method may include passing the first clock signal to a second clock recovery unit associated with a second channel. The method…

Wavelength division multiplexer array

Granted: February 21, 2017
Patent Number: 9575255
In an example embodiment, a WDM array includes an optical filter, N common ports, N reflection ports, and N pass ports. The N common ports may be positioned to a first side of the optical filter. N may be greater than or equal to two. The N reflection ports may be positioned to the first side of the optical filter. The N pass ports may be positioned to a second side of the optical filter opposite the first side.

N×N optical switch

Granted: February 21, 2017
Patent Number: 9575259
An optical cross-connect connecting a series of optical input ports to a series of optical output ports includes at least a first group of input/output port arrays, each including a series of optical input/output ports disposed horizontally and configured to project or receive optical signals. A plurality of steering elements selectively steer optical signals along switching trajectories between the input and output ports. An angle-to-offset conversion unit converts optical signals…

Pin cadence for high-speed connectors

Granted: February 21, 2017
Patent Number: 9577386
A connector includes pins having a pinout including a functional designation cadence. The functional designation cadence includes a first ground pin, a first signal pin, a no-connect pin, a second signal pin, and a second ground pin, where the first signal pin is positioned between the first ground pin and the no-connect pin, the no-connect pin is positioned between the first and second signal pins, and the second signal pin is positioned between the no-connect pin and the second ground…

Method of monitoring an optoelectronic transceiver with multiple flag values for a respective operating condition

Granted: February 21, 2017
Patent Number: 9577759
The circuit monitors operation of an optoelectronic transceiver that includes a laser transmitter and a photodiode receiver. The circuit includes analog to digital conversion circuitry configured to convert a first analog signal corresponding to a first operating condition of said optoelectronic transceiver into a first digital value, and convert a second analog signal corresponding to a second operating condition of said optoelectronic transceiver into a second digital value…