| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
|
|
|
|
A Novel Scheme for Hundred-Hertz Linewidth Measurements with the Self-Heterodyne Method |
| PENG Yu** |
School of Physics, Beijing Institute of Technology, Beijing 100081
|
|
| Cite this article: |
|
PENG Yu 2013 Chin. Phys. Lett. 30 084208 |
|
|
|
|
Abstract We propose a novel scheme to accurately determine the hundred-hertz linewidth using the delayed self-heterodyne method, in which the delay time is far less than the coherence time of the laser. This exceeds the former understanding of the delayed self-heterodyne technique, which requires a prohibitively long fiber. The self-heterodyne autocorrelation function and power spectrum are evaluated, and by numerical analysis we ensure that ?3 dB of the power spectrum is applied to the self-heterodyne linewidth measurements. For a laser linewidth of less than 100 Hz, the linewidth can be measured directly by a 10 km fiber, and in a more general case, the linewidth can be deduced from ?20 dB or ?40 dB of the fitting Lorentzian curve.
|
|
|
Received: 17 June 2013
Published: 21 November 2013
|
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
