I'm quite new to the mode theory, but as I understand, single mode fiber should only allow a single pattern of wavelength + polarization.

I'm assuming a non-modulated non-coherent light (a white LED, for example) coupled into single-mode fiber.

According to brief info I found, including this post, multiple modes of light can propagate through a single mode fiber but will experience losses, Will energy of all coupled modes transfer into heat inside of a single-mode core due to interference? Or loss occurs only in context of data transfer, when light is modulated?

  • $\begingroup$ Often when wavelengths are close enough together we can treat them all the same $\endgroup$
    – user253751
    Aug 25 at 1:00
  • $\begingroup$ There may be slightly different attenuation rates/km, but as @user253751 wrote, there's no steep cliff for supporting single-mode vs. wavelength. Polarization is usually controlled by making the core elliptical. BTW, most loss ends up in the cladding or exiting the fiber rather than being absorbed. $\endgroup$ Aug 25 at 14:35
  • $\begingroup$ @CarlWitthoft so this means single mode fiber will just gradually radiate away light until only one mode is left? $\endgroup$ Aug 27 at 20:44

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