6. Optical fiber
6.1 Problem position
Optical delays are produced using single-mode optical fiber coils. A delay of 5 µs corresponds to 1 km of fiber.
Assuming 100 channels in the 1550 nm wavelength range, spaced 0.8 nm apart (100 GHz), the optical band occupied by the signals is 80 nm.
Standard single-mode optical fibers have zero chromatic dispersion around 1,300 nm, which increases with wavelength to reach a typical value of 17 ps · km –1 · nm –1 around 1,550 nm. For a 1 km length of such a fiber and 80 nm of optical bandwidth used, the maximum differential delay between the different signals is 1,360 ps.
To achieve long delays, it is...
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