Cedric Yim Kit Lam

7286760, Oct 23, 2007

Mar 3, 2003

10/377030

Cedric F. Lam - Irvine CA, US
Aleksandra Smiljanic - Atlantic Highlands NJ, US

AT&T, Corp. - Bedminster NJ

H04J 14/00

398 60, 398 83

Wavelength assignment schemes that provide full-connectivity in RANs with fixed-tuned OADMs. In the first scheme, wavelengths are assigned to nodes according to Hadamard code, and in the second scheme, bands of contiguous wavelengths are assigned to nodes. Simulation results show that on the average, the Hadamard wavelength assignment schemes approach the performance of RANs with OADMs that add-drop all wavelengths, while saving 50% of the TDM terminals. The saving of TDM terminals by using wavelength tunable OADMs vary in different cases. Tunable OADMs are advantageous for lower traffic granularity and more interactions of a RAN with the outside network.

7466918, Dec 16, 2008

Sep 24, 2007

11/860213

Cedric F. Lam - Irvine CA, US
Aleksandra Smiljanic - Atlantic Highlands NJ, US

AT&T Corporation - New York NY

H04J 14/00

398 69, 398 83

Wavelength assignment schemes that provide full-connectivity in RANs with fixed-tuned OADMs. In the first scheme, wavelengths are assigned to nodes according to Hadamard code, and in the second scheme, bands of contiguous wavelengths are assigned to nodes. Simulation results show that on the average, the Hadamard wavelength assignment schemes approach the performance of RANs with OADMs that add-drop all wavelengths, while saving 50% of the TDM terminals. The saving of TDM terminals by using wavelength tunable OADMs vary in different cases. Tunable OADMs are advantageous for lower traffic granularity and more interactions of a RAN with the outside network.

8139476, Mar 20, 2012

Oct 13, 2006

11/580537

Winston I. Way - Irvine CA, US
Cedric Lam - Irvine CA, US

Vello Systems, Inc. - Menlo Park CA

G01R 31/08
G06F 11/00
G01F 11/00

370217, 370221, 370222, 370248, 370225, 370242

Techniques and apparatus for optical communication networks including fiber ring networks with protection switching to maintain optical communications when an optical failure occurs and to automatically revert to normal operation when the optical failure is corrected. Implementations include use of a circulating optical probe signal at an optical probe wavelength within the gain spectral range of optical amplifiers used in a fiber ring network to detect an optical failure.

8457165, Jun 4, 2013

May 26, 2010

12/788121

Hong Liu - Palo Alto CA, US
Cedric F. Lam - San Jose CA, US

Google Inc. - Mountain View CA

H01S 3/10

372 20, 372 50121, 372 96, 372102

Techniques, devices and systems for optical communications based on wavelength division multiplexing (WDM) that use tunable multi-wavelength laser transmitter modules.

20050158047, Jul 21, 2005

Jul 16, 2004

10/893750

Winston Way - Irvine CA, US
Xin Jiang - Irvine CA, US
Cedric Lam - Irvine CA, US

H04B010/20

398059000

This application describes, among others, fiber ring networks with two fiber rings to provide local fiber failure protection in each node and capability for each node to broadcast to other nodes, and to establish uni-directional and bi-directional communications with one or more selected nodes. Each optical channel may have a single optical break point in the ring networks and this single optical break point is located in a designated node. Various application may advantageously use such ring networks such as ring networks with asymmetric traffic like video-on-demand systems and other information systems.

20210167577, Jun 3, 2021

May 7, 2019

17/057649

- Mountain View CA, US
Cedric Fung Lam - San Carlos CA, US
Xiangjun Zhao - Fremont CA, US
Shuang Yin - Sunnyvale CA, US
Liang Du - Santa Clara CA, US
Changhong Joy Jiang - Dublin CA, US
Adam Edwin Taylor Barratt - Portland OR, US
Claudio Desanti - ountain View CA, US
Muthu Nagarajan - Santa Clara CA, US

Google LLC - Mountain View CA

H01S 5/0625
H01S 5/024
H04B 10/572
H04B 10/50
H04J 14/02

A method () for tuning a tunable laser () includes delivering a bias current (I) to an anode of a distributed Bragg reflector (DBR) section diode (D) disposed on a shared substrate of the tunable laser and receiving a burst mode signal () indicative of a burst-on state or a burst-off state. When the burst mode signal is indicative of the burst-off state, the method includes offsetting the bias current at the anode of the DBR section diode by one of sourcing a push current with the bias current to the anode of the DBR section diode or sinking a pull current away from the bias current at the anode of the DBR section diode. When the burst mode signal is indicative of the burst-on state, the method also includes ceasing any offsetting of the bias current at the anode of the DBR section diode.

20210151952, May 20, 2021

May 7, 2019

17/057645

- Mountain View CA, US
Cedric Fung Lam - San Carlos CA, US
Shuang Yin - Sunnyvale CA, US
Xiangjun Zhao - Fremont CA, US
Liang Du - Santa Clara CA, US
Changhong Joy Jiang - Dublin CA, US
Adam Edwin Taylor Barratt - Portland OR, US
Claudio Desanti - ountain View CA, US
Muthu Nagarajan - Santa Clara CA, US

Google LLC - Mountain View CA

H01S 5/042
H01S 5/0625
H04B 10/50
H04B 10/54
H04B 10/564
H01S 5/026

A method () of biasing a tunable laser () during burst-on and burst-off states includes receiving a burst mode signal () indicative of the burst-on state or the burst-off state and when the burst mode signal is indicative of the burst-on state: delivering a first bias current (I) to an anode of a gain-section diode () disposed on a shared substrate of the tunable laser; and delivering a second bias current (I) to an anode of phase-section diode () disposed on the shared substrate. The second bias current is less than the first bias current. When the burst mode signal transitions to be indicative of the burst-off state, the method also includes delivering the first bias current to the anode of the gain-section diode; and delivering the second bias current to the anode of the phase-section diode wherein the first bias current is less than the second bias current.

20190215093, Jul 11, 2019

Mar 13, 2019

16/351788

- Mountain View CA, US
Cedric Fung Lam - San Carlos CA, US
Shuang Yin - Sunnyvale CA, US
Changhong Joy Jiang - Dublin CA, US
Ke Dong - San Jose CA, US

Google LLC - Mountain View CA

H04J 14/02
H04Q 11/00

A method of establishing communication between an optical line terminal and an optical network unit within an optical access network includes receiving a signal indication from an optical transceiver of an optical line terminal. The signal indication includes: (i) a loss-of-signal indication indicating non-receipt of an upstream optical signal from the optical network unit; or (ii) a signal-received indication indicating receipt of the upstream optical signal from the optical network unit. The method includes determining whether the signal indication includes the loss-of-signal indication. When the signal indication includes the loss-of-signal indication, the method includes instructing the optical transceiver to cease signal transmission from the optical transceiver to the optical network unit. Moreover, when the signal indication includes the signal-received indication, the method includes instructing the optical transceiver to transmit a downstream optical signal from the optical transceiver to the optical network unit.