Transmitting redstone signals by some form of laser would be a faster and resource efficient method of communicating with circuits far away. The laser system, explained more in depth below, consists of a translator, laser core, transceiver bulb, and reflector lens.
"Lasers seem high tech for this game..."
The concept of concentrating and redirecting light is not entirely a new concept. Some of us may be familiar with Archimedes' mirror that set fire to Roman ships. The difference here is that we're not redirecting light from the sun.
Laser Core: The main block component of the laser system. It will not transmit or recieve signals by itself, requiring translators and transceivers to be attached directly to the block. Laser cores adjacent to one another will not power eachother.
Translator: A small block that fits to the top, side, and bottom of the laser core (close in similarity to a head in terms of placement). This block will turn normal redstone signals into laser signals and vice versa. It determines where the input and output are, and multiple of them can be placed on a single laser core, provided there is a space open on at least one of the six sides.
Right-clicking the translator will switch between input and output mode. In input mode, signals can only be transferred into the laser system, while in output mode signals can only be transferred out of the laser system. Translators will not power eachother through a laser core.
The strength of a redstone signal travelling into the system through the translator will be outputted by a laser.
Transceiver Bulb: A small block that is placed like the translator but serves a different purpose. Lasers are transmitted or recieved by the bulb, but not at the exact same time. For instance, a bulb that is transmitting will not recieve signals and a recieving bulb will not transmit signals.
A redstone signal transferred through a translator will activate it, and a laser being received by a bulb will activate one or more translators (depending how many are attached to the laser core), provided the translators are in output mode. A transceiver that is receiving signals will also power on any other transceivers attached to the laser core.
In order for a transceiver to to recieve a signal, a laser must travel directly into it.
The Laser: Shares a similar appearance to the beacon's beam, only bright red and noticeably thinner. Lasers can travel up, down, N, S, E, and W. Lasers travel through transparent blocks (including barriers) but will be stopped by any opaque block. Lasers, from their start to finish, produce a faint amount of light. Lasers can also cross each other without interference.
The maximum distance that a laser can travel by itself is 8 chunks, but will not lose signal strength within that distance. The signal strength of a laser will also not change the distance that the laser will travel. Lasers must go into a transceiver --> laser core --> transceiver system to be renewed similarly to a repeater, but without an increase to signal strength.
Any entity that makes direct contact with a laser will be dealt damage, and any flammable block in the laser's direct path can catch on fire. Damage is determined by signal intensity.
Reflector Lens: A transparent block that has a circular "window" on all six sides. A laser travelling into this block will travel out of the other five sides. An opaque block placed adjacent to one of the sides will block a signal from travelling in or out. Lasers can only travel through a maximum of 4 reflector lenses (to reduce lag) and will travel straight through the 5th+ lens as if it wasn't there.
I will provide images if I can upon request if this is difficult to understand. If you request images, please stand by.