Finisar Patent Grants

Optical fiber securing device

Granted: August 8, 2017
Patent Number: 9726838
An optical fiber securing device may include a passage, an optical fiber seat, and a boundary portion. The passage may have an entrance and an exit, the passage configured to receive therein an optical fiber inserted through the entrance, as well as an epoxy. An epoxy path may be provided as a pathway between an epoxy well and the passage. The optical fiber seat may be configured to receive at least a portion of the optical fiber, the optical fiber seat configured to position an end of…

Rigid-flexible circuit interconnects

Granted: August 1, 2017
Patent Number: 9723725
In an example embodiment, a circuit interconnect includes a first printed circuit board (PCB), a second PCB, a spacer, and an electrically conductive solder joint. The first PCB includes a first electrically conductive pad. The second PCB includes a second electrically conductive pad. The spacer is configured to position the first PCB relative to the second PCB such that a space remains between the first PCB and the second PCB after the first electrically conductive pad and the second…

Wavelength division multiplexing of uncooled lasers with wavelength-common dispersive element

Granted: July 25, 2017
Patent Number: 9715115
An example demultiplexer may include at least one dispersive element that is common to multiple wavelength channels. The demultiplexer may additionally include multiple field lenses positioned optically downstream from the at least one dispersive element, where a number of the field lenses is equal to a number of the wavelength channels. An example multiplexer may include a single piece power monitor assembly that includes a collimator lens array, a focusing lens array, and a slot…

Chip on flex optical subassembly

Granted: July 18, 2017
Patent Number: 9709760
One example embodiment includes an optical subassembly (OSA). The OSA includes a flex circuit, an optical port, and an active optical component subassembly. The flex circuit is constructed of at least one electrically-conductive layer and at least one electrical insulator layer. The optical port defines a barrel cavity and is mechanically coupled to the flex circuit at a flex connection. The active optical component subassembly is positioned within the barrel cavity and electrically…

Pluggable connector

Granted: July 18, 2017
Patent Number: 9709763
In an embodiment, a pluggable connector configured to removably couple an end of an optical cable to an optoelectronic module includes a first portion and a second portion. The first portion is configured to engage a latch slot of the optoelectronic module to retain within the optoelectronic module a ferrule optically coupled to optical fibers of the optical cable. The second portion is configured to engage the ferrule to prevent removal of the ferrule from within the optoelectronic…

Multiplexer/demultiplexer based on diffraction and reflection

Granted: July 11, 2017
Patent Number: 9703042
Transmissive diffraction grating(s), reflector(s), and multiple optical sources/receivers are arranged such that each one of multiple optical signals at corresponding different wavelengths co-propagating along a multiplexed beam path would: (i) be transmissively, dispersively diffracted at a multiplexed transmission region of a grating; (ii) propagate between the multiplexed transmission region and multiple demultiplexed transmission regions of a grating undergoing reflection(s) from the…

Wavelength division multiplexing

Granted: July 11, 2017
Patent Number: 9703044
A system may include a first light source configured to generate a first beam of light at a first wavelength; a second light source configured to generate a second beam of light at a second wavelength; a third light source configured to generate a third beam of light at a third wavelength; and a fourth light source configured to generate a fourth beam of light at a fourth wavelength. The system may also include a thin-film filter, a first polarization beam splitter (PBS), a wave plate…

Signal conversion

Granted: July 11, 2017
Patent Number: 9705503
A circuit may include an input terminal configured to receive an input signal with a first voltage swing and an output terminal. The circuit may also include a first transistor, a second transistor, a third transistor, and a control circuit. The control circuit may be coupled to the input terminal, a gate terminal of the first transistor, and a gate terminal of the second transistor. The control circuit may be configured to adjust voltages provided to the gate terminals based on the…

Method and apparatus for stabilization of optical transmitter

Granted: June 27, 2017
Patent Number: 9692518
A DP-QPSK optical transmitter includes an outer MZM comprising a first parent MZM comprising a first child MZM and a second child MZM that modulates a QPSK signal with a first polarization. A second parent MZM includes a first child MZM and a second child MZM that modulates a QPSK signal with a second polarization. The outer Mach-Zehnder modulator multiplexes the first and second polarization embedded into a dual-polarization QPSK signal generation. A first optical detector detects the…

Optical wavelength automatic adaptation of transceivers

Granted: June 27, 2017
Patent Number: 9692547
In some aspects, an example method may include receiving, at a receiver of a first optoelectronic module, a loss of signal indicator from a second optoelectronic module that is remote from the first optoelectronic module. The method may include iteratively cycling through transmission of optical signals on a plurality of wavelength channels to the second optoelectronic module until the loss of signal indicator terminates in response to receiving the loss of signal indicator. The method…

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…