This 15 meter SIIG fiber optic Displayport cable is 15m long (49 feet), and supports up to 4K 60Hz using DisplayPort 1.2. It is new in a sealed box.
Additional details from the manufacturer:

• ACTIVE OPTICAL CABLE (AOC): Connects DisplayPort source devices to DisplayPort equipped monitors or displays over long distances. Fiber/Copper inner conductor material and gold-plated connectors provide maximum video clarity
• ULTRA HD 4K: Transmits Ultra HD 4K signals up to 15 meters (49ft). Compliant with DisplayPort 1.2 specification, 1, 2 and 4 lanes at 1.62Gbps, 2.7Gbps & 5.4Gbps. 21.6Gbps signal bandwidth and up to 4Kx2K 60Hz YUV 4:4:4 resolution
• UNIDIRECTIONAL DESIGN: Features unidirectional connection requiring the cable to be installed in a specific direction, the end marked Source plugs into a DisplayPort source and the end marked Display plugs into a DisplayPort TV, monitor, projector, and other display devices. Note: This cable features unidirectional design, which requires the cable to be installed in a specific direction. Each DisplayPort connector is labeled for easy cable orientation to ensure proper device connection
• ADVANCED FEATURES: Plug and Play and hot swappable. Premium quality latching DisplayPort connector prevents accidental disconnection. Very low Electro Magnetic Interference (EMI) and Radio Frequency Interference (RFI) profile allows installing the cable into sensitive environments