Title :
An improved delayed self-heterodyne interferometer for linewidth measurements
Author :
Dawson, Jay W. ; Park, Namkyoo ; Vahala, Kerry J.
Author_Institution :
Dept. of Appl. Phys., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The authors demonstrated a delayed self-heterodyne interferometer with a recirculating delay, in which loss was partially compensated by an erbium-doped fiber amplifier. A resolution limit of 606 Hz was achieved with an 11-km fiber delay line, as compared to 18.2 kHz for the standard single-pass case. The possible effect of spectral broadening due to amplifier noise is considered and found to have a negligible effect on the system performance.<>
Keywords :
fibre lasers; laser variables measurement; light interferometers; optical fibres; spectral line breadth; 11 km; Er doped fibre amplifier; amplifier noise; delayed self-heterodyne interferometer; fiber delay line; linewidth measurements; loss; recirculating delay; resolution limit; single-pass case; spectral broadening; Delay lines; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Loss measurement; Optical coupling; Optical fiber couplers; Optical fiber losses; Optical fibers; Photodiodes; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
