-
公开(公告)号：US20170373823A1
公开(公告)日：2017-12-28
申请号：US15649078
申请日：2017-07-13
Applicant: Google Inc.
Inventor： Leon Zhou , Sheng-Hui Yang
CPC classification number: H04L7/0075 , H04B10/11 , H04L7/0016 , H04L7/0029 , H04L7/0083 , H04L7/033 , H04L7/0331 , H04L7/10
Abstract: A method includes receiving an optical signal through an optical link and determining a receiving power for the optical link. The method further includes comparing the receiving power for the optical link to a first receiving power threshold and transitioning a clock and data recovery circuit form a normal mode to a holdover mode when the receiving power is less than the first receiving power threshold. The clock and data recovery circuit, when operating in the holdover mode, configured to hold a recovered clock to a known-good clock frequency. When the receiving power for the optical link is greater than a second receiving power threshold, the method initiates a transition of the clock and data recovery circuit from the holdover mode to the normal mode and reacquires synchronization between the recovered clock and a current rate of the incoming data stream using the known-good clock frequency.
-
公开(公告)号：US20170339695A1
公开(公告)日：2017-11-23
申请号：US15156459
申请日：2016-05-17
Applicant: Google Inc.
Inventor： Chiachi Wang , Sheng-Hui Yang , Romain Clement , Michael Sholl
CPC classification number: H04W72/0453 , H04B7/18513 , H04B10/1123
Abstract: A method includes receiving a first optical signal at a first communication terminal from a second communication terminal through a free space optical link. The received optical signal contains a modulated unique frequency tone. The method also includes mixing the modulated unique frequency tone with a reference signal to provide a mixed output signal and determining a signal strength of the modulated unique frequency tone based on the mixed output signal. The reference signal includes a same frequency as the modulated unique frequency tone. The method adjusts an optical head of the first communication terminal to establish acquisition and optical beam pointing with the second communication terminal based on the signal strength of the modulated unique frequency tone received from the second communication terminal.
-
公开(公告)号：US09749123B1
公开(公告)日：2017-08-29
申请号：US15176984
申请日：2016-06-08
Applicant: Google Inc.
Inventor： Leon Zhou , Sheng-Hui Yang
CPC classification number: H04L7/0075 , H04B10/11 , H04L7/0016 , H04L7/0029 , H04L7/0083 , H04L7/033 , H04L7/0331 , H04L7/10
Abstract: A method includes receiving an optical signal through an optical link and determining a receiving power for the optical link. The method further includes comparing the receiving power for the optical link to a first receiving power threshold and transitioning a clock and data recovery circuit form a normal mode to a holdover mode when the receiving power is less than the first receiving power threshold. The clock and data recovery circuit, when operating in the holdover mode, configured to hold a recovered clock to a known-good clock frequency. When the receiving power for the optical link is greater than a second receiving power threshold, the method initiates a transition of the clock and data recovery circuit from the holdover mode to the normal mode and reacquires synchronization between the recovered clock and a current rate of the incoming data stream using the known-good clock frequency.
-
-
Search Results
3
records
(took 0.015 seconds)
