What type of fiber does this media converter support?

This media converter supports single-mode optical fiber.

What is the maximum distance this media converter can extend a Gigabit Ethernet network?

The maximum distance this media converter can extend a Gigabit Ethernet network is 10 km over single-mode duplex fiber optic cable.

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StarTech.com Single Mode SC Fiber Ethernet Media Converter - 1000BASE-LX Gigabit Fiber Optic to Copper Bridge - 10/100/1000 Network 10km

Converts and extends a Gigabit Ethernet (1000 Mbps) network up to 10 km over single-mode fiber on 1000BASE-LX networks
Provides a cost-effective Ethernet to fiber/copper to fiber link
Supports a maximum distance of 10 km over single mode duplex fiber optic cable (SC connection)
Compact design and wall mountable
Non-blocking full wire-speed forwarding rate
Provides DIP switch supporting Link Fault Pass-through function
LED Indicators for simple Ethernet/fiber network link monitoring
1310 nm wavelength
Supports IEEE 802.1q Tag VLAN pass through