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1.发明授权公开(公告)号：US10084547B2
公开(公告)日：2018-09-25
申请号：US15914583
申请日：2018-03-07
Applicant: Google LLC
Inventor： Xiang Zhou , Ryohei Urata , Erji Mao , Hong Liu , Christopher Lyle Johnson
Abstract: This disclosure provides systems, methods, and apparatus for mitigating the effects of interference signals on optical signals received at a direct-detection optical receivers. The optical receivers are capable of attenuating interference noise signals resulting from the interference between a transmitted optical signal transmitted from a transmitter to the optical receiver and one or more additional signals received at the optical receiver. The interference can be due to multi-path interference or due to in-band interference. The receivers include a tunable filter for filtering the received optical signal to remove the interference. A frequency offset module processes the received optical signal to determine a frequency offset indicative of the difference between the carrier frequencies of a modulated optical signal and an interference optical signal. The offset frequency and a bandwidth determined by the frequency offset module can be used to adjust the tunable filter to remove the interference signal from the received signal.
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2.发明申请公开(公告)号：US20180198533A1
公开(公告)日：2018-07-12
申请号：US15914583
申请日：2018-03-07
Applicant: Google LLC
Inventor： Xiang Zhou , Ryohei Urata , Erji Mao , Hong Liu , Christopher Lyle Johnson
IPC: H04B10/69
CPC classification number: H04B10/6971 , H04B10/697
Abstract: This disclosure provides systems, methods, and apparatus for mitigating the effects of interference signals on optical signals received at a direct-detection optical receivers. The optical receivers are capable of attenuating interference noise signals resulting from the interference between a transmitted optical signal transmitted from a transmitter to the optical receiver and one or more additional signals received at the optical receiver. The interference can be due to multi-path interference or due to in-band interference. The receivers include a tunable filter for filtering the received optical signal to remove the interference. A frequency offset module processes the received optical signal to determine a frequency offset indicative of the difference between the carrier frequencies of a modulated optical signal and an interference optical signal. The offset frequency and a bandwidth determined by the frequency offset module can be used to adjust the tunable filter to remove the interference signal from the received signal.
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