Oplink Communications Patent Grants

Optical fiber ribbon retractor

Granted: July 18, 2017
Patent Number: 9709767
Methods, systems, and apparatus for optical communications. One of the apparatuses includes a spool comprising a spool wheel, one or more separate spool portions positioned on the spool wheel, and one or more bearings positioned on the spool wheel, wherein the one or more spool portions and the one or more bearings are configured such that an optical fiber ribbon can be wound through the spool; and a spring coupled to the spool wheel such that the spring provides a rotational force on…

Faraday rotator mirror

Granted: July 11, 2017
Patent Number: 9703124
Methods, systems, and apparatus for optical communications. One of the apparatuses comprises a birefringent crystal configured to separate an incoming light beam input at a first port into component light beams having orthogonal polarization directions and directing the component light beams on respective paths to exit locations on the birefringent crystal; and a Faraday rotator positioned between the birefringent crystal and a beam folding optic assembly, wherein the Faraday rotator is…

Optical circulator array

Granted: July 4, 2017
Patent Number: 9696485
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for optical communications. In one aspect, an optical circulator array includes a plurality of stacked three port circulators each having a respective first port of a first port array, a respective second port of a second port array, and a respective third port of a third port array, wherein each of the plurality of stacked three port circulators share optical components including: a first…

Switchable-gain optical amplifier

Granted: June 13, 2017
Patent Number: 9680283
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for optical communications. One optical amplifier includes an input port; a bar-cross switch optically coupled to the input port; a first gain stage optically coupled between first port of the bar-cross switch and to an output port; and a secondary gain stage optically coupled between a second port and a third port of the bar-cross switch, wherein in a bar-state of the bar-cross switch the…

External cavity fabry-perot laser

Granted: May 2, 2017
Patent Number: 9640943
Methods, systems, and apparatus, for an external cavity FP laser. In one aspect, an apparatus is provided that includes a FP laser diode; a Faraday rotator (FR) coupled to receive an optical output of the FP laser diode and that rotates a polarization of the optical output; an optical fiber coupled at a first end to receive the output of the FR; a WDM filter coupled to a second end of the optical fiber to receive the optical signal from the optical fiber; and a FRM coupled directly or…

2×2 wavelength selective switch array

Granted: March 7, 2017
Patent Number: 9588299
Methods, systems, and apparatus for optical wavelength selective switching. One 2×2 wavelength selective switch array includes a plurality of optical input ports configured to receive one or more optical input beams, and a plurality of optical output ports configured to receive one or more one or more optical output beams wherein the plurality of optical input ports and optical output ports form an array of 2×2 optical port pairs; one or more optical conditioning and wavelength…

Athermal arrayed waveguide grating wavelength division multiplexer

Granted: December 13, 2016
Patent Number: 9519103
Athermal arrayed waveguide grating wavelength division multiplexers applicable to a relatively wide temperature range. One athermal arrayed waveguide grating wavelength division multiplexer includes a base board including an arrayed waveguide grating chip, wherein the base board and the arrayed waveguide grating chip are divided into a first portion and a second portion through at least one division plane; and a sliding deflection component positioned on the base board including a first…

Twin multicast switch

Granted: November 15, 2016
Patent Number: 9497519
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for optical switching. An optical switch device includes a first multicast switch unit; and a second multicast switch unit, wherein each of the first and second multicast switch units respectively include: multiple optical input ports; multiple optical switches; multiple optical splitters/combiners; and multiple optical output ports.

Compact WDM optical modules

Granted: September 13, 2016
Patent Number: 9444218
Methods, systems, and apparatus, for optical communication. One optical assembly includes a Fabry-Perot (FP) laser diode; a first polarization controller (PC) coupled to the FP laser diode; a circulator having four ports, a first port coupled to the first PC; an optical fiber coupled at a first end to a second port of the circulator; a second PC coupled to a third port of the circulator; an optical amplifier coupled to the second PC and a fourth port of the circulator; a wavelength…

Configuring secure wireless networks

Granted: September 1, 2015
Patent Number: 9125049
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for configuring secure wireless networks. One of the methods includes receiving, at a security system management device, protocol and key information for establishing a connection as a client device to the wireless IP device, wherein the protocol and key information is received in response to a user transmitting an identifier for the IP device to a service provider system; establishing…

Wavelength division multiplexing

Granted: June 16, 2015
Patent Number: 9057841
Technologies relating to wavelength division multiplexing are provided. In one implementation, a wavelength division multiplexing (WDM) coupler is provided. The WDM coupler includes an input block including a first tube, the first tube holding an input dual fiber pigtailed capillary, the capillary holding an input fiber and a reflection fiber, a center block including a center tube holding a first inner tube and a second inner tube, the first inner tube holding a first lens within the…

Optical amplifier

Granted: May 26, 2015
Patent Number: 9042007
Methods, systems, and apparatus for optical communications. In one aspect, an optical amplifier includes a feed-forward first amplification stage including a rare-earth doped fiber receiving an optical signal and an injected pump light; and a plurality of subsequent amplification stages each including a corresponding rare-earth doped fiber, wherein each of the subsequent amplification stages receives a separately injected portion of the remnant pump light from the first amplification…

Security system power management

Granted: December 9, 2014
Patent Number: 8907807
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for power management. One of the methods includes determining that there is a loss in electricity to a security system management device; entering low power state; receiving a wireless sensor alert while in the low power state; in response to the alert: returning to normal power state to transmit an alarm to a service provider system, and returning to low power state after transmitting the…

Wavelength selective switch

Granted: October 21, 2014
Patent Number: 8867016
Methods, systems, and apparatus, for optical switching. In one aspect, a wavelength selective switch includes one or more optical input ports; one or more optical output ports; a first optical wavelength dispersion element configured to separate the plurality of wavelength channels of the input optical beam; a second optical wavelength dispersion element configured to combine two or more separate optical beams each having one or more different wavelengths, into a combined beam having the…

Optical amplifier and control method for constant output power

Granted: August 27, 2013
Patent Number: 8520300
This specification describes technologies relating to controlling optical amplifiers. In one implementation, an optical amplifier is provided. The optical amplifier includes a light amplifying medium for receiving an input optical signal and outputting an output amplified signal; a first measuring block for measuring a change in power of the input signal; a pump laser for supplying pump light to the light amplifying medium; and an electronic control for controlling the power of the pump…

Optical amplifier output control based on change in detected input power

Granted: March 13, 2012
Patent Number: 8134776
This specification describes technologies relating to controlling optical amplifiers. In one implementation, an optical amplifier is provided. The optical amplifier includes a light amplifying medium for receiving an input optical signal and outputting an output amplified signal; a first measuring block for measuring a change in power of the input signal; a pump laser for supplying pump light to the light amplifying medium; and an electronic control for controlling the power of the pump…

Method for detecting a signal on a passive optical network

Granted: February 28, 2012
Patent Number: 8126334
A transceiver assembly is provided for use in an optical telecommunications network. The circuitry arrangement in the transceiver of the present invention generates a ranging signal that is transmitted along the fibers attached thereto and then filters the return signal in an manner that eliminates virtually all of the noise effects found on the fiber to provide a highly reliable timing signal for an accurate delay calculation. A band pass filter is supplied in line before the input…

Variable gain erbium doped fiber amplifier

Granted: March 22, 2011
Patent Number: 7911684
Systems, methods, and apparatuses are provided for variable gain optical fiber amplifiers. In one implementation, a variable gain optical amplifier is provided. The amplifier includes a first erbium doped fiber configured to receive an input optical signal, a second erbium doped fiber configured to output an output optical signal, a gain flattening filter positioned between the first erbium doped fiber and the second erbium doped fiber, a pump laser configured to provide energy to the…

Configurations and methods for manufacturing optical devices using an athermal platform

Granted: March 2, 2010
Patent Number: 7672551
The present invention discloses an improved optical device having at least a first and second optical components. The optical device further includes a first extending tube securely attached to the first and second optical components as a first building block wherein the first and second optical components are aligned and position adjusted in the position-holding-and-fixing means and securely attached thereto by a room-temperature UV curable epoxy UV cured at room temperature. The…

Carrier-suppressed optical time domain multiplexing

Granted: August 11, 2009
Patent Number: 7574139
A method and an apparatus for implementing carrier suppressed data format on conventional OTDM modules is provided. Adaptive phase shifting of optical signals traversing one of the tributaries of an OTDM module is performed with feedback loop control. A tapped portion of the input carrier signal is phase modulated at a frequency fc, and is combined with a tapped portion of the output from the OTDM. A phase shifter controller fed with this combined signal photodetects and band-pass…