SUMMARY
The fiber link usually introduces phase noise to the signal because of temperature fluctuation and vibration, causing damage to the stability of the frequency signal recovered at the remote site. Conventional proposals to assess instability loss often use the local oscillator as the reference to compare with the recovered frequency signal directly at the remote site. Meanwhile, an extra fiber link is added to send the recovered frequency signal at the remote site back to the an extra fiber link is added to send the recovered frequency signal at the remote sit 2 of 13 to the . . .

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