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There are many fiber types, but two main fiber types: single mode fibers (SM) and Multi-mode fibers (MM).

For G.657 fibers, there are four sub-types: G.657A1, G.657A2, G.657B2 and G.657B3.
“1”, “2” and “3” mean the minimum bending radius.
The mininum bending radius of G.657 fibers as follows:

Both the core and the cladding of an optical fiber are made of highly purified silica glass. An optical fiber is manufactured from silicon dioxide by either of two methods. The first, the crucible method, in which powdered silica is melted, produces fatter, multimode fibers suitable for short-distance transmission of many light wave signals. The second, the vapor deposition process, creates a solid cylinder of core and cladding material that is then heated and drawn into a thinner, single-mode fiber for long-distance communication.

In the latest National Electrical Code 2020, there are Optical fiber cables with the following classification: OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC. The following article briefly introduces these cable codes:

Most fiber optic transceivers we are using in the WDM transmission system are with fixed wavelength, neither a CWDM or DWDM wavelength. It will result in a huge back system in the case a certain transceiver is broken. while a tunable DWDM transceiver is an idea solution for it since it is able to adjust the wavelengths according to the lambda requirement of the system.

LSZH (low smoke zero halogen), or with variant name called LSHF (Low Smoke Halogen Free) and LS0H Cable (Low Smoke 0 (zero) Halogen). The LSZH Cables is manufactured from thermoplastic compounds, it emits very little smoke when burnt, beside it Low Smoke Zero Halogen cable is that they are much lighter to work with and are more environmentally friendly.