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The method is attractive for high-repetition-rate OFCs that lead to a lower shot-noise, but are generally more difficult to tightly lock.
Journal ArticleDOI
D. A. Van Baak, George Herold 
9 Citations
Our results show how a lock-in amplifier can be used to measure the spectral density of noise in the case of a noise-only input signal.
In turn, lock-free algorithms provide significant reliability and performance advantages over lock-based implementations.
It is shown that utilizing the data and error channels to make the lock decision will prevent false lock from occurring.
It is shown that the windowing technique reduces the phase noise required for breaking the frequency lock in the receiver.
To the best of our knowledge, this is the first lock-free method that provides all of these properties.
Experimental results show the advantages of the proposed lock-in
It emerges that the lock detector has two very useful qualities.
Proceedings ArticleDOI
11 May 2017
16 Citations
Hence, the lock is a unique combination of various aforementioned security features providing absolute solution to problem of security.

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