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Single mode light coupling into multimode fiber

(joined April 2014)
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Dear all,

I have a basic question on multimode fibers in OptiSystem. In the lab, I can connect a single mode laser with a multimode fiber and there I observe multimodes at the fiber output but in OptiSystem, I can not repeat the same as either the optical source has to be multimode if I want to use Measured-Index Multimode Fiber or Parabolic-Index Multimode Fiber blocks. If I use Linear Multimode Fiber block then I do not see any modes on the Spatial Visualizer. In this case, I can not use Spatial Optical Receiver or Spatial PIN Photodector because of absence of multimodes after the Linear Multimode Fiber block.

I have attached a simple .osd file to better understand my question.

Can anybody help me with the concept.

Cheers,
Ahmad

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