NLC Timing System Research and Development
Early Experiments (summer 1998): These experiments used a Fabry Perot laser diode and a short 2.2 Km fiber. They measured the fiber temperature coefficient and demonstrated dispersion length adjustment. Acceptable (<1 degree X-band) phase noise was demonstrated through a 2.2Km fiber.
Fiber phase transmission test system: Constructed and tested from January to October 1999. This system was based on the phase detection system used for the RF beam phase experiment, and was used to test the fiber length feedback. Problems with phase jumps and noise in the DFB diode laser prevented stable operation of the dispersion feedback loop. A fiber temperature phase control loop was operated with 20 degree X-band stability over 15Km.
Fiber test system version 2: This system is under construction. It contains two basic components: A PC based data acquisition system that should allow higher acquisition rates, and a tunable diode laser. Testing with the existing DFB laser should begin by the end of 1999, with the tunable laser expected to be operational March 2000.
Page by Josef Frisch frisch@slac.stanford.edu 04/22/2002
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