Song F Jiang

6771908, Aug 3, 2004

Feb 12, 2001

09/781863

Peter Van Eijk - Eemnes, NL
Reed K. Even - Livingston NJ
Piet Van Heyningen - Almere, NL
Song Jiang - Whippany NJ
Woojune Kim - Seoul, KR
Fengkun Liu - Great Neck NY
Yong-Kwan Park - Annandale NY

Lucent Technologies Inc. - Murray Hill NJ

H04B 1008

398 66, 398 8, 398 20, 398 12, 398 25, 398 35, 398 52, 398 53, 398 54, 398 71, 398 77, 398 78, 398 98, 398 99, 398100, 398101, 398102, 398103

An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit, (2) a protection OSU of a protection circuit, and (3) one or more optical network terminals (ONTs), where an ONT has (i) a working line termination (LT) unit of the working circuit and connected to the optical splitter via a working optical fiber and (ii) a protection LT unit of the protection circuit and connected to the optical splitter via a protection optical fiber. The present invention enables fast protection switching from the working circuit to the protection circuit. The arrival times of corresponding downstream cells are measured at both the working and protection LT units of the ONT, and information related to the arrival times is transmitted from the ONT to the protection OSU. A propagation delay value is generated based on the transmitted information for use by the protection OSU for communications with the ONT if and when protection switching is implemented upon detection of a failure in the working circuit.

6778781, Aug 17, 2004

Feb 12, 2001

09/781862

Peter Van Eijk - Eemnes, NL
Reed K. Even - Livingston NJ
Piet Van Heyningen - Almere, NL
Song Jiang - Whippany NJ
Woojune Kim - Seoul, KR
Fengkun Liu - Great Neck NY
Yong-Kwan Park - Annandale NJ

Lucent Technologies Inc. - Murray Hill NJ

H04B 1008

398100, 398 8, 398 20, 398 25, 398 35, 398 77, 398 78, 398 98, 398 99, 398101, 398102, 398103, 370242, 714712, 714 2, 714 25

An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs), where the protection OSU has a protection burst mode receiver (BMR) configured to receive an upstream optical signal from the optical splitter. The algorithm determines whether the protection OSU is functioning improperly. A reset pulse is applied at the protection BMR at a particular timing position and an attempt is made to interpret the current upstream cell received at the protection BMR. This process is repeated using different timing positions for the BMR reset pulse until the current upstream cell is correctly interpreted, e. g. , based on the correct identification of an ATM header error correction (HEC) byte in the upstream cell. If, after a specified number of cycles, no upstream cells are correctly interpreted, then the protection circuit is determined to have failed.

6868232, Mar 15, 2005

Feb 12, 2001

09/781864

Peter Van Eijk - Eemnes, NL
Reed K. Even - Livingston NJ, US
Piet Van Hevingen - Almere, NL
Song Jiang - Whippany NJ, US
Woojune Kim - Seoul, KR
Fengkun Liu - Great Neck NY, US
Yong-Kwan Park - Annandale NJ, US

Lucent Technologies Inc. - Murray Hill NJ

H04B010/00
H04B010/08

398 5, 398 19, 398 53, 398 67, 398145, 398153, 398154, 398168

An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs). The present invention enables fast protection switching from the working OSU to the protection OSU. In one embodiment, the arrival times of corresponding upstream ranging reply PLOAM cells are measured at both the working and protection OSUs during ranging operations of the working OSU. In another embodiment, a cell delineation procedure is initiated at the protection OSU during normal, non-ranging operations of the working OSU to enable the protection OSU to correctly delineate upstream cells and the arrival times of corresponding upstream cells are then measured at both the working and protection OSUs. In either case, a propagation delay value is generated based on the measured arrival times for use by the protection OSU for communications with the one or more ONTs if and when protection switching is implemented upon detection of a failure in the working circuit, possibly without requiring the protection OSU to perform any ranging for the one or more ONTs.

8078054, Dec 13, 2011

Jun 30, 2008

12/164253

Song Jiang - Watchung NJ, US
Colin Kelly - Ottawa, CA
Xiang Liu - Marlboro NJ, US
Derrick Remedios - Ottawa, CA

Alcatel Lucent - Paris

H04J 14/02
H04B 10/08

398 32, 398 34, 398 83

For wavelength division multiplexing (WDM) communications, apparatus and methods are provided for performing tone-based optical channel monitoring that is less sensitive to stimulated Raman scattering (SRS). In tone-based optical channel monitoring, in which WDM channels are modulated with one or more tones, detecting and measuring the tone power is commonly used as a measure of signal power in each channel. In WDM systems with long fiber spans and high signal powers, however, SRS tends to transfer energy from shorter wavelengths to longer wavelengths, whereby the tones are no longer accurately indicative of the signal power of the individual wavelength channels. Apparatus and methods are provided which reduce the effect of SRS by filtering the monitored WDM signals into sub-bands and detecting each sub-band independently.

59781190, Nov 2, 1999

Feb 18, 1997

8/802809

Clinton Randy Giles - Morganville NJ
Song Jiang - Whippany NJ

Lucent Technologies Inc. - Murray Hill NJ

H04J 1402

359132

A system and method for maintaining alignment between a source and router in a Wavelength Division Multiplexed (WDM) fiber optic network. In a preferred embodiment, a narrow band of the wavelengths emitted by the WDM source is designated as a monitor channel. The monitor channel is matched in wavelength to a fiber grating that is located in the optical path between the source and router so that the grating reflects the monitor channel light while allowing all other source light to pass through unimpeded. By monitoring the reflected light and adjusting the source wavelengths to maximize the amount of reflected light, alignment between the source and router is maintained.