Inventor

HU JUNQIANG

US54 patents

⚠️ This page may combine multiple inventors who share the name “HU JUNQIANG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HU JUNQIANG

NEC LAB AMERICA INC

Encoding method and system for quasi-cyclic low-density parity-check code

Wavelength division multiplexed passive optical network

Orthogonal frequency division multiple access (OFDMA) based passive optical network (PON) architecture and its extension to long distance

Passive optical network system employing sub-carrier multiplexing and orthogonal frequency division multiple access modulation schemes

Scalable hybrid packet/circuit switching network architecture

End-to-end hitless protection in packet switched networks

Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination

Optical fiber sensing system with reduced spatial resolution and noise for multiple application uses

Uni-directional signal transmit method using distributed fiber sensing

Distributed fiber sensing interrogator with detachable end

Burst switching system using optical cross-connect as switch fabric

Adaptive optical amplifier for WDM systems

Flexible-client, flexible-line interface transponder

Active microphone for increased DAS acoustic sensing capability

Distributed optical fiber sensing using point sensors

High-speed long codeword QC-LDPC soft decision decoder

Fast optical cable identification using acoustic pen

Laser frequency drift compensation in forward distributed acoustic sensing

Suppressed out-of-band level for increasing loss margin and stable ABC operation of coded DFOS system

Physimetric-based data security for coded distributed temperature sensing

Reduced complexity polarization combining method for coherent DAS

Two stage processing distributed fiber optic sensing (DFOS) interrogator for acoustic modulated signals

Spatial averaging method for coherent distributed acoustic sensing

Polarization diversity combining method in coherent DAS maintaining phase continuity

Saturation caused phase jump avoidance in DAS

Two stage detection method for distributed vibration detection

Networked systems for monitoring fire extinguisher operational readiness

Apparatus, methods, and systems for monitoring fire extinguisher operational readiness

Hitless service in a variable rate optical transponder

Combining I-Q and/or PolMux optical receiver to enable single detector

Solution for hitless protection in high-speed OTN framer and front-end

Efficient transfer of sensor data on dynamic software defined network (SDN) controlled optical network

Mechanism for remote safety monitoring sensor with low-power consumption communication

Reference signal generation for lock-in amplifier in high sensitivity gas sensing system

Optical network switching using N:N transponder through time-domain multiplexing and burst mode access

Elastic client interface for tunable optical transponder

Variable bit-rate QPSK transmitter and method employing polarization manipulation

Polarization switching for optical fiber communications

HU JUNQIANG

System and method for providing wireless over a passive optical network (PON)

Energy efficient OFDM transceiver

Hitless protection for traffic received from 1+1 protecting line cards in high-speed switching systems

System and method for frequency-domain chromatic dispersion and polarization mode dispersion compensation with time-domain channel estimation

Optical signal generation with D/A converters and optical clock pulse stream

QIAN DAYOU

Single wavelength source-free OFDMA-PON communication systems and methods

Polarization independent frequency domain equalization (FDE) for chromatic dispersion (CD) compensation in PolMux coherent systems

Direct detection for receiving polarization multiplexing signals

Chromatic dispersion compensation using sign operations and lookup tables

LUO YUANQIU

WDM passive optical network with parallel signal detection for video and data delivery

WEI WEI

Programmable optical network architecture

XU LEI

Coherent optical orthogonal frequency division multiplexing (OFDM) reception using self optical carrier extraction