Using Single Mode SFPs with Multimode Fiber Cables

I'm trying to make sure I'm not gonna have any problems with the following setup:

I'm currently using 50 micron Multimode fiber cables with two 1000BASE-LX Single Mode 1310 nm SFP connectors on either end.  These are being used to trunk switches together.  Is it OK to mix the Single Mode and Multimode in this way?  I can ping across this set up with no issues and no apparently latency, and the trunk seems to be working fine (as far as tagging packets and such), but will I run into problems with this setup in the future?  CRC errors, that sort of thing?

Thanks in advance.
hachempAsked:
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rfc1180Connect With a Mentor Commented:
Per Cisco:

GLC-LH-SM=
 Cisco 1000BASE-LX/LH SFP transceiver module for SMF and MMF, 1300-nm wavelength, commercial operating temperature range, 32°F to 158°F (0°C to 70°C)
 
SFP-GE-L=
 Cisco 1000BASE-LX/LH SFP transceiver module for SMF and MMF, 1300-nm wavelength, extended operating temperature range, 23°F to 185°F (-5°C to 85°C)
 
GLC-LX-SM-RGD=
 Cisco 1000BASE-LX/LH SFP transceiver module for SMF and MMF, 1300-nm wavelength, industrial operating temperature range, -40°F to 185°F (-40°C to 85°C)
 
You should be ok

Billy
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