A power and communication system, comprising: a reel disposed at a wellsite surface, wherein a reel junction box is disposed within the reel, and containing coiled tubing, wherein a first optical conductor is carried with the coiled tubing for conveyance within the wellbore; a control system disposed at the wellsite surface, comprising a further junction box; a rotary joint disposed in association with the reel and transmitting optical communications, between the control system and a portion of the first optical conductor disposed in the wellbore, via at least a second optical conductor extending at least partially between the rotary joint and the control system, the reel junction box housing electrical and optical connections between the first optical conductor and a conduit connected with the rotary joint, the further junction box housing electrical and optical connections between the second optical conductor and components of the control system; a downhole tool string comprising a downhole electronics and processing system with an electrical/optical conversion module and/or a downhole controller and a downhole junction box housing connections between the first optical conductor and the components of the control system; a downhole tool connected to the coiled tubing for conveyance within the wellbore via the coiled tubing, wherein the rotary joint transmits optical communications between the downhole tool and the control system via at least the first and second optical conductors (186, 184), a first electrical conductor disposed with the first optical conductor (186, 372) within the coiled tubing and electrically connected between the downhole tool and an electrical, non-optical pathway of the rotary joint; and a second electrical conductor disposed with the second optical conductor (184, 372) and electrically connected between the control system and the electrical, non-optical pathway of the rotary joint; wherein the first electrical conductor, the second electrical conductor, and the electrical, non-optical pathway of the rotary joint collectively form a portion of an electrical telemetry system operable for transmitting electrical communications from the control system to the downhole tool and wherein the first optical conductor (186, 372), the second optical conductor (184, 372) and the rotary joint collectively form a portion of an optical telemetry system operable for transmitting optical communications from the downhole tool to the control system, wherein the coiled tubing is electrically connected with an electrical conductor of the conduit to convey returning electrical current back to a power source of the control system via the rotary joint and the second optical conductor and the conduit. a reel disposed at a wellsite surface, wherein a reel junction box is disposed within the reel, and containing coiled tubing, wherein a first optical conductor is carried with the coiled tubing for conveyance within the wellbore; a control system disposed at the wellsite surface, comprising a further junction box; a rotary joint disposed in association with the reel and transmitting optical communications, between the control system and a portion of the first optical conductor disposed in the wellbore, via at least a second optical conductor extending at least partially between the rotary joint and the control system, the reel junction box housing electrical and optical connections between the first optical conductor and a conduit connected with the rotary joint, the further junction box housing electrical and optical connections between the second optical conductor and components of the control system; a downhole tool string comprising a downhole electronics and processing system with an electrical/optical conversion module and/or a downhole controller and a downhole junction box housing connections between the first optical conductor and the components of the control system; a downhole tool connected to the coiled tubing for conveyance within the wellbore via the coiled tubing, wherein the rotary joint transmits optical communications between the downhole tool and the control system via at least the first and second optical conductors (186, 184), a first electrical conductor disposed with the first optical conductor (186, 372) within the coiled tubing and electrically connected between the downhole tool and an electrical, non-optical pathway of the rotary joint; and a second electrical conductor disposed with the second optical conductor (184, 372) and electrically connected between the control system and the electrical, non-optical pathway of the rotary joint; wherein the first electrical conductor, the second electrical conductor, and the electrical, non-optical pathway of the rotary joint collectively form a portion of an electrical telemetry system operable for transmitting electrical communications from the control system to the downhole tool and wherein the first optical conductor (186, 372), the second optical conductor (184, 372) and the rotary joint collectively form a portion of an optical telemetry system operable for transmitting optical communications from the downhole tool to the control system, wherein the coiled tubing is electrically connected with an electrical conductor of the conduit to convey returning electrical current back to a power source of the control system via the rotary joint and the second optical conductor and the conduit.