US Patent Issued to China National Petroleum, BGP Inc. China National Petroleum on Sept. 8 for "Method and system for correcting imbalance in in-phase/quadrature demodulation of optical fiber das data" (Chinese Inventors)

ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,729,998, issued on Sept. 8, was assigned to China National Petroleum Corp. (Beijing) and BGP Inc. China National Petroleum Corp. (Hebei, China).

"Method and system for correcting imbalance in in-phase/quadrature demodulation of optical fiber das data" was invented by Yanpeng Li (Hebei, China), Shaohua Zhang (Hebei, China) and Fei Li (Hebei, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for correcting imbalance in IQ demodulation of optical fiber DAS data is disclosed. The method includes obtaining I/Q signals I0 and Q0 of each sampling on an optical fiber from a DAS acquisition instrument; performing DC bias correction on the I/Q signals...