I am guessing you are referring to what we in the US often term "dark fiber".
When one acquires fiber optic-based services in a metropolitan or long haul (inter-city) context, your provider can either present your with an interface on their active equipment (Ethernet from a router or switch port, or a transmission interface (T-1/E-1, DS-3/E-3, OC-xx and such) from transmission equipment such as an optical add/drop multiplexer (OADM) such as a Cisco ONS 15454) or simply present you with a fiber - with the distant end typically in another of your own facilities. This latter case is referred to as 'dark fiber', meaning you have to provide any and all equipment necessary to carry services over it (that is, to 'light' it).
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