[Mike Thomson]

Take look on QuestTel 3G/HD/SD-SDI over fiber products, works grate and cost only $340 for TX/RX kit.
It comes with many flavors 1,2 and 4 Channel SDI over single fiber, and they also can mix with Ethernet or RS data or external analog CVBS video and analog Audio SDI Over Fiber

In addition the have HDMI overer fiber it allows you to transport HDMI 4KX2K – 25/30Hz signal up to 20km from the source device to destination display using SC connectors. HDMI Over Fiber

[Mike Thomson]

The equipment used for communications over multi-mode optical fiber is less expensive than that for single-mode optical fiber. Typical transmission speed and distance limits are 100 Mbit/s for distances up to 2 km (100BASE-FX), 1 Gbit/s up to 1000 m, and 10 Gbit/s up to 550 m.
Also I found this company QuestTel they have full scope SDI OVER FIBER products single mode

[Mike Thomson]

The equipment used for communications over multi-mode optical fiber is less expensive than that for single-mode optical fiber. Typical transmission speed and distance limits are 100 Mbit/s for distances up to 2 km (100BASE-FX), 1 Gbit/s up to 1000 m, and 10 Gbit/s up to 550 m.
Also I found this company they have full scope SDI OVER FIBER products single mode