Questions on high-speed USB & HDMI design (TMDS,CML,LVDS,PCIE, etc.)

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Hello,

I'm currently planning a complex (for me) hobby project. This will be my first time creating a design with highspeed differential and USB / HDMI signaling.

I have some questions if someone who has experience will be so kind to answer. (And yes, I've spend hours and hours researching this myself, but still have these questions)

• HDMI (TMDS) uses CML for the differential pairs. But what standard does USBC (Superspeed, superspeed+) use?
• Do alternate modes change the signaling standard used in usbc? E.g. with DisplayPort alt mode, does it use the superspeed signaling standard* or the Displayport signaling standard?
• My understanding is the thunderbolt 3.0 alt mode passes through 4 PCIE 3.0 lanes over TX1,TX2,RX1,RX2. I assume these each become bidirectional, but again, does it use the PCIE 3.0 signaling standard or superspeed standard*?
• Are there any ICs out there to take a bi-directional differential link and split it into two unidirectional differential pairs? My application is a specialized fiber transceiver for USB/HDMI and I'll need to convert the bidirectional D+/D-, SBUS+,SBUS- and PCIE alt mode lanes to unidirectional.
• I have and can only afford a 1Ghz/10GS scope. Are there any USB/HDMI compliance testing labs in the US that are affordable for a hobbyist to verify designs?

* By superspeed standard, I mean the signaling itself e.g. CML,LVDS,etc. I'm not that worried at the moment about serdes scrambling and encoding schemes. For now I'm just trying to figure out how to design the physical interface.

Thanks in advance!

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Any one worked with these high speed standards?