Submarine optical amplifier for optical telecommunication systems and related production process

A production process of a submarine optical amplifier for optical telecommunication systems, wherein the submarine optical amplifier comprises:

• a vessel, comprising a central body, having a housing cavity, and a first and a second end body, and
• a layer of electrically insulating material which externally, entirely and with continuity covers the vessel,
• wherein the process comprises:
• covering in part the vessel with the electrically insulating material for making a part of the layer of electrically insulating material comprising at least a central portion of the layer of electrically insulating material which covers the central body;
• subsequently to covering in part the vessel, inserting an apparatus for optical amplification at least partially in the housing cavity;
• subsequently to inserting, assembling the vessel by fixing at least the first end body to the central body at a first end of the central body for closing the housing cavity, wherein at least a first thermally insulating element is coupled to the first end body;
• subsequently to assembling, at least partially covering the first end body with the electrically insulating material for making a first portion of the layer of electrically insulating material, which forms, together with the part of the layer of electrically insulating material, the layer of electrically insulating material,
• and wherein the first thermally insulating element is interposed between the central body and the first portion of the layer of electrically insulating material.