a receiver module disposed within the receiver module housing, the receiver module having an optical to electrical converter for converting optical signals into electrical signals, wherein {TAIL ~ at least a portion} of {HEAD ~ the optical signal propagating} along the tube toward the second end of the tube passes out of the second end of the tube and is optically coupled onto the OEC 
a receiver module disposed within the receiver module housing , the receiver module having an optical to electrical converter for converting optical signals into electrical signals , wherein { TAIL ~ at least a portion } of { HEAD ~ the optical signal propagating } along the tube toward the second end of the tube passes out of the second end of the tube and is optically coupled onto the OEC
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