The optical source used in a fiber is an injection laser with a relative spectral width $$\frac{{{\sigma _\lambda }}}{\lambda }$$ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.
A. 1.2 nm
B. 1.3 nm
C. 0.77 nm
D. 0.98 nm
Answer: Option C
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