Measuring Raman time constant (TR) for subpicosecond soliton pulses in standard single-mode fiber

The Raman time constant (TR) used in the generalized nonlinear Schrodinger equation is determined experimentally to be around 1550 nm, based on the Raman self-frequency shift in standard single mode fiber. The measured effective value of the TR is found to be 3.0 fs. Detailed error analysis shows that the uncertainty in the measurement is less than +/- 1.0 fs. Accurate knowledge of the value of the TR is essential in modeling subpicosecond pulse propagation in optical fibers.

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