Fiber Optic Submarine Cable Splitter Inside Manhole

oh im sorry i paraphrase the question wrong.

Inside the beach manhole the submarine cable will be connected to the terrestrial cable which is consist of 2 cable.

1--Vdc power cable ,and

2--Fiber optic cable

how the submarine cable which is just 1 cable split into 2(power & fiberOptic) so that can be connected to the terrestrial cable

Perhaps your question would best be answered by a seller of fiber optic devices.

I could understand using DC power to run a repeater, but I don't see how you will have DC coming in from a submarine cable. The reason we use AC power is because DC has limitations with respect to long distances.

Admittedly, I don't work in that area. It just sounds unreasonable as stated.

yes i already ask few forum but stil no answer.

yes the repeaters need to use DC power, the only DC limitation is it cannot utilize transformer. so to provide high voltage to long distance is not impossible because of inverter. even main electrical supplier nowadays use HVDC to transmit power over long distance. Why? AC over long distance means very high inductance and capacitance loss. DC over long distance only had resistance loss. AC short distance loss high but cheap equipment like transformer. DC short distance low loss but expensive inverter.

so, short distance AC win. long distance DC win

*i studies under electrical power

note this DC only apply to very long distance. submarine cable --> very long distance. thus use DC

Try this calculator for for a side by side comparison....keep your watts equal...

http://www.electrician2.com/calculators/vd_calculator.html

so to provide high voltage to long distance is not impossible because of inverter.

An inverter is an AC device, not DC. Inductors and capacitors store and release energy, they don't loose it.

In an AC power system with a power factor of 1, the load is purely resistive.

Me thinks you are highly unqualified to be involved with this project.

ok i was wrong after all.

it was rectifier

but please read this http://en.wikipedia.org/wiki/High-voltage_direct_current

*i am not involving with any project. i am just 18 year old college student. this is just a group assignment which is a case study. i just want to know how the single fiber optic submarine cable split into 2 cable (fiberOptic/PowerCable)

no comment?

Ah, that makes me less concerned. Frequently we have questions asked from people who are involved in a project that is well above their training which is a recipe for disaster or death.

Wikipedia is known to have incorrect information in some subjects. I went to the link that you listed. It is absolutely wrong on this page. This argument was resolved (for the USA) in early 1900's in a rather notable fight over control of the market for power generators. The two players were Thomas Edison and Nicoli Tesla. Edison wanted to set up DC power stations about 1 mile (1.6 Km)apart in all directions. Imagine the smog that would have been created from that idea!

Tesla, on the other hand, proved that for long distances it was much easier to transmit AC power at very high voltage (and consequently low current) and then convert it back using magnetic transformers. Converting DC to other levels requires a lot more sophistication and they just didn't have the components that we have now.

Still, the whole consideration is about minimizing loss. The more loss there is in the system, the more that has to be generated to make up for it. Consequently, to mitigate that loss, Edison wanted to keep his power transmission lines down to no more than 1 mile. Incidentally, they each tried to prove how the other guys power system was more dangerous. To do this, they put on several public displays of electrocution of animals on both DC and AC, trying to put the other guy out of business. This led to the introduction of the electrical chair as a way of killing criminals who had been sentenced to death. The problem was that it didn't always work so well. Some criminals could take a lot of electricity and still survive. The electric chair is no longer in use.

Changing DC from high voltage to lower voltage causes more losses than changing the level of AC from high to low or visa versa. In general, it is about line resistance and current flow. The more current you have the higher your losses will be.

As for splitting the signal in a fiber optic cable goes, it is easier to think about this in terms of energy transfer. If you cut the available energy in half, then you have to have more sensitive detectors or repeaters to amplify the signal so that it will be distinguishable from background noise. I hope this answers your question.

You may be able to find a book in the library about the famous marketing wars between Edison and Tesla. It is interesting reading.

Look up the term "optical splitter" in the search engine of your choice.