Liping Chen

Author:

Liping Chen

ISBN #:

7503659807

US Patent:

20030214965, Nov 20, 2003

Filed:

Sep 26, 2002

Appl. No.:

10/256657

Inventors:

LiPing Chen - San Jose CA, US
David Piehler - Half Moon Bay CA, US
Adi Bonen - Los Gatos CA, US
Jumin (Jerry) Liu - Cupertino CA, US

International Classification:

H04L012/28

US Classification:

370/431000

Abstract:

Optical transceivers used in data communications equipment are typically bidirectional and require two-way communications in order to maintain their operability. However, in some applications such as cable television, the traffic is highly unbalanced with very high bandwidth requirements in one direction and minimal bandwidth requirements in the opposite direction. Hence for such efficient and cost effective one-way communication applications, unidirectional fiber optic transceivers are useful. There is provided here a unidirectional transceiver provided internally with a keep-alive signal generator to enable unidirectional transmissions. The keep alive signal is, for instance, idle characters for a Gigabit Ethernet communication system, or any other suitable handshake signal which provides the desired operability.

US Patent:

20050047799, Mar 3, 2005

Filed:

Aug 26, 2003

Appl. No.:

10/649007

Inventors:

Frederic Coppinger - San Jose CA, US
LiPing Chen - San Jose CA, US
David Piehler - Half Moon Bay CA, US

International Classification:

H04B010/04

US Classification:

398188000

Abstract:

Method and apparatus to reduce composite second order (CSO) non-linearity and/or dispersion degradation in multi-wavelength optical communications systems. Optical communication systems using optical fibers are prone to suffer from undesirable distortion due to composite second order distortion caused by self phase modulation, cross phase modulation, and the optical Kerr effect in conjunction with polarization dependence loss. Introduction of a delay (phase shift) between the two optical signals in a dual optical signal system has been found to reduce or suppress the composite second order distortion. The delay shift is provided in either the electrical (RF) mode or in the optical mode. This delay is typically provided in a transmitter or a repeater in an optical system. The typical amount of the delay is half a wavelength of the high frequency RF modulation or for a typical system operating with RF signal up to 550 MHz, one nanosecond of delay. This amount of delay can be provided with approximately a 20 centimeter length of optical fiber in the transmitter. This delay is applied to only one of the two wavelengths, thus providing the desired phase shift.

US Patent:

20060203862, Sep 14, 2006

Filed:

Mar 10, 2005

Appl. No.:

11/078971

Inventors:

Adi Bonen - Los Gatos CA, US
Hoa Nguyen - San Jose CA, US
LiPing Chen - San Jose CA, US
Wei Huang - San Jose CA, US

Assignee:

Harmonic Inc. - Sunnyvale CA

International Classification:

H01S 3/04

US Classification:

372034000

Abstract:

An optical transmitter for coarse wavelength division multiplexed (CWDM) optical communication systems uses a conventional laser (e.g. laser diode) and in addition a heater element is provided thermally coupled to the laser. A thermal sensor and associated control circuit drive the heater so as to control the power consumed by the heater to assure that the laser's temperature is not lower than a predetermined minimum working temperature. When the sensed laser temperature is above this predetermined minimum temperature, the control circuit turns off the heater. The total operating range of the transmitter in terms of ambient temperature is thus extended beyond its inherent operating range by the maximum laser temperature rise created by the heater. This allows a CWDM optical transmitter with the heater and control circuitry to be used in outdoor applications where a wide ambient temperature range is required.

US Patent:

20210067845, Mar 4, 2021

Filed:

Jul 13, 2020

Appl. No.:

16/927632

Inventors:

- Menlo Park CA, US
He Li - Mountain View CA, US
Renyu Liu - Mountain View CA, US
Liping Chen - Fremont CA, US

International Classification:

H04N 21/8545
H04N 21/6583
H04N 21/2187
H04N 21/2362
H04N 21/472
H04N 21/845
H04N 21/431
H04N 21/4788
H04N 21/45

Abstract:

The present disclosure is directed toward systems and methods for providing a call to action in connection with a live video stream. For example, systems and methods described herein enable a broadcaster to configure one or more benefits and one or more calls to action. Systems and methods described herein further provide the one or more calls to action in connection with a live video stream and based on the broadcaster's configurations. In response to a live video stream viewer correctly interacting with a provided call to action, systems and methods described herein provide a benefit to the viewer.

US Patent:

20180124477, May 3, 2018

Filed:

Nov 1, 2016

Appl. No.:

15/340736

Inventors:

- Menlo Park CA, US
He Li - Mountain View CA, US
Renyu Liu - Mountain View CA, US
Liping Chen - Fremont CA, US

International Classification:

H04N 21/8545
H04N 21/6583
H04N 21/2187
H04N 21/2362
H04N 21/472
H04N 21/845
H04N 21/431
H04N 21/4788
H04N 21/45

Abstract:

The present disclosure is directed toward systems and methods for providing a call to action in connection with a live video stream. For example, systems and methods described herein enable a broadcaster to configure one or more benefits and one or more calls to action. Systems and methods described herein further provide the one or more calls to action in connection with a live video stream and based on the broadcaster's configurations. In response to a live video stream viewer correctly interacting with a provided call to action, systems and methods described herein provide a benefit to the viewer.