Benyuan Zhu

US Patent:

8594502, Nov 26, 2013

Filed:

Mar 19, 2010

Appl. No.:

12/727685

Inventors:

Benyuan Zhu - Princeton NJ, US

Assignee:

OFS Fitel, LLC - Norcross GA

International Classification:

H04J 14/00
H04B 10/00

US Classification:

398 67, 398157

Abstract:

A bidirectional optical communications network comprises an optical transmission fiber for carrying a downstream signal at a first wavelength and a multiplicity of upstream signals at a second, different wavelength. The fiber is characterized by distributed Raman gain over at least an extended portion of its length. A first terminal, optically coupled to one end of the fiber, includes a first transmitter for generating the downstream signal, a first receiver for detecting the upstream signals, and at least one pump source for generating pump light that provides Raman amplification to either the downstream signal or the upstream signal or both. A multiplicity of second terminals, optically coupled to another end of the fiber, each includes a second transmitter for generating one of the upstream signals, and a second receiver for detecting a downstream sub-signal. A passive optical node is configured to (i) split the downstream signal into a multiplicity of downstream sub-signals each propagating at the first wavelength to a separate one of the second terminals and (ii) to combine each of the upstream signals from each of the second terminals onto the fiber for transmission to the first terminal. In another embodiment, the network is a GPON compatible with current ITU standards.

US Patent:

20110129190, Jun 2, 2011

Filed:

Dec 2, 2010

Appl. No.:

12/959184

Inventors:

John Michael Fini - Metuchen NJ, US
Thierry Franck Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS Fitel, LLC - Norcross GA

International Classification:

G02B 6/036
G02B 6/04

US Classification:

385126, 264 128

Abstract:

A multicore optical fiber includes a plurality of core regions disposed within a common cladding region. Each of the plurality of core regions is configured, in combination with the common cladding region, to propagate light along a longitudinal axis of the fiber. At least two core regions are configured to inhibit resonant coupling of propagated light therebetween within a selected region of operation. At least one segment of the fiber includes a twist that is configured such that when the twisted segment is subjected to a bend having a selected radius, the twist creates a controlled change in the amount of crosstalk between the at least two core regions, compared with the amount of crosstalk between the at least two core regions when a bend having the selected radius is introduced into a non-twisted segment of the fiber.

US Patent:

20110274398, Nov 10, 2011

Filed:

Mar 10, 2011

Appl. No.:

13/045064

Inventors:

John M. Fini - Jersey City NJ, US
Thierry F. Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS FITEL, LLC - Norcross GA

International Classification:

G02B 6/028
G02B 6/02

US Classification:

385124, 385126

Abstract:

A multicore fiber comprises a plurality of cores extending along the length of a fiber body. Each of the cores is surrounded by a cladding. The plurality of cores and surrounding cladding provide respective index variations, so as to form a respective plurality of waveguides for conducting parallel data transmissions from a first end of the fiber to a second end. The plurality of cores has a cross-sectional geometry in which the plurality of cores is configured in a polygonal array, in which at least some of the cores are positioned at the vertices of the array. The polygonal array is configured such that neighboring cores in the array are separated from each other by a distance that is sufficient to prevent crosstalk therebetween.

US Patent:

20110274435, Nov 10, 2011

Filed:

Mar 10, 2011

Appl. No.:

13/044859

Inventors:

John M. Fini - Jersey City NJ, US
Thierry F. Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS FITEL, LLC. - Norcross GA

International Classification:

H04B 10/12
H04B 10/00

US Classification:

398139, 398182

Abstract:

An optical data link includes first and second pluralities of transmission devices, at least one of which is configured as an array. A multichannel transmission link has a first end connected to the first plurality of transmission devices and a second end connected to the second plurality of transmission devices so as to form a plurality of parallel transmission channels therebetween. The multichannel transmission link includes a multicore fiber with a plurality of individual cores having a configuration matching the array configuration of the at least one plurality of transmission devices. The multicore fiber has an endface connected directly to the at least one plurality of transmission devices, with the individual cores of the multicore fiber aligned with respective devices in the at least one plurality of transmission devices. Further described are access networks and core networks incorporating a transmission link comprising at least one span of a multicore fiber.

US Patent:

20110279888, Nov 17, 2011

Filed:

Mar 16, 2011

Appl. No.:

13/049320

Inventors:

John M. Fini - Jersey City NJ, US
Thierry F. Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS FITEL, LLC - Norcross GA

International Classification:

H01S 3/067

US Classification:

359334, 3593413

Abstract:

An optical transmission and amplification system includes a multichannel transmission span with a length of a multicore transmission fiber having a plurality of individual transmission cores. A first tapered multicore coupler provides connectivity between the plurality of transmission cores of the multicore fiber and a respective plurality of individual transmission leads. A fiber amplifier is provided having a plurality of individual cores including at least one pump core and a plurality of amplifier core. A second tapered multicore coupler provides connectivity between the amplifier cores of the fiber amplifier and a respective plurality of amplifier leads, and between the at least one pump core and a respective pump lead.

US Patent:

20110280517, Nov 17, 2011

Filed:

Mar 16, 2011

Appl. No.:

13/049597

Inventors:

John M. Fini - Jersey City NJ, US
Thierry F. Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS FITEL, LLC - Norcross GA

International Classification:

G02B 6/26
B23P 17/04

US Classification:

385 43, 29428

Abstract:

Devices and techniques are described for connecting each of plurality of terminals to respective individual cores of a multicore fiber. Each of the plurality of terminals is provided with a respective length of a single-core fiber. The single-core fibers are configured to maintain modal properties that arc substantially the same, within a tolerance range, at the front and rear ends, as the single-core fiber is tapered. The single-core fibers are assembled together. The front end of the assembly is tapered to form a front cross-section in which the single-core fiber cores are arranged in a configuration matching that of the cores of the multicore fiber.

US Patent:

20130188949, Jul 25, 2013

Filed:

Oct 12, 2011

Appl. No.:

13/878883

Inventors:

John M Fini - Metuchen NJ, US
Thierry Franck Taunay - Bridgewater NJ, US
Man F Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

Assignee:

OFS Fitel, LLC - Norcross GA

International Classification:

G02B 6/02

US Classification:

398 28, 385126

Abstract:

An optical fiber has two or more core regions disposed within a common cladding region. Each of the core regions is configured to guide a respective light transmission comprising at least one optical mode along the length of the fiber. The cores are arranged within the common cladding region according to a core configuration that substantially prevents crosstalk between modes of neighboring cores in the fiber, in a deployment of the fiber in which cross-coupling between neighboring cores is affected by perturbations arising in the deployed fiber.

US Patent:

20140036351, Feb 6, 2014

Filed:

Jul 29, 2013

Appl. No.:

13/953352

Inventors:

Thierry F. Taunay - Bridgewater NJ, US
Man F. Yan - Berkeley Heights NJ, US
Benyuan Zhu - Princeton NJ, US

International Classification:

G02B 6/02
G02B 6/28

US Classification:

35934131, 35934132, 65407

Abstract:

An optical fiber coupler connects transmission multicore optical fiber (TMCF) with an amplifier multicore optical fiber (AMCF) and a plurality of optical pump fibers. The coupler includes a plurality of signal cores extending between a multicore input endface and a coupler output endface, and a plurality of pump cores extending between a pump input and the coupler output endface. The multicore input endface is connectable to the TMCF, and the pump input is connectable to the optical pump fibers. Each pump core is paired with a corresponding signal core to form a core pair that is adiabatically tapered such that signal light carried by the signal core is combined with pump light carried by the pump core. The coupler output endface is connectable to the AMCF such that the combined light output of each core pair is provided as an input to a respective AMCF core.