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The cutoff wavelength for a step index fiber is 1400 nm. How many modes can propagate at a signal wavelength of (a) 1550 nm,

The cutoff wavelength for a step index fiber is 1400 nm. How many modes can propagate at a signal wavelength of (a) 1550 nm, (b) 1100 nm, and (c) 750 nm. Con- sider different polarizations as different modes.

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