Archive for the ‘Fiber Optics’ Category

RF over Fiber

Sunday, February 2nd, 2014

RF over fiber is where you modulate an RF signal onto the light beam and thus transmit it at a lower loss over a long distance.  It is an analog usage as opposed to a digital one as used in data transmission such as an ethernet extender. I have found some equipment for doing this but have not yet found anything that appears it will do the full Internet + Cable TV solution to extend the pole to internet modem solution that is cheap enough to use.

Research Links


For now this is not a viable solution to the house in the forest long internet cable extension problem.  It will probably get there soon though.

How to add connectors to the end of a fiber optic cable

Saturday, February 1st, 2014


Extending Ethernet Long Distances using Fiber Optic Media Converters

Saturday, February 1st, 2014

Research Links


The MC111CS and MC112CS are complimentary in that the Tx wavelength is the Rx wavelength of the other.  See excerpt below.

The MC112CS is a media converter designed to convert 100BASE-FX fiber to 100Base-TX copper media or vice versa. Adopting WDM technology, MC112CS takes only one fiber cable to transmit and receive data, which will save half cabling cost for you. Designed under IEEE 802.3u 10/100Base-TX and 100Base-FX standards, the MC112CS is designed for use with single-mode fiber cable utilizing the SC-Type connector. The MC112CS supports longwave (LX) laser specification at a full wire speed forwarding rate. It works at 1310nm on transferring data and at 1550nm on receiving data. So the other end device to cooperate with the MC112CS should work at 1550nm on transferring data and at 1310nm on receiving data. Another TP-LINK?s media converter MC111CS is just one of the examples to cooperate with MC112CS.


What are Media Converters


MC111CS & MC112CS Fiber optic media converter link

  • I tested this setup with a 120 foot long patch cord.  It worked.  

The parts inside the box

Fiber Optic Power Budget Estimation

Saturday, February 1st, 2014

Research Links


Fiber Type Wavelength Fiber Attenuation /km (1) Fiber Attenuation per km (2) Connector Loss Splice Loss
Multimode 50/125um 850nm 3.5 dB 2.5 dB 0.75 dB 0.1 dB
1300nm 1.5 dB 0.8 dB 0.75 dB 0.1 dB
Multimode 62.5/125um 850nm 3.5 dB 3.0 dB 0.75 dB 0.1 dB
1300nm 1.5 dB 0.7 dB 0.75 dB 0.1 dB
Single Mode 9um 1310nm 0.4 dB 0.35 dB 0.75 dB 0.1 dB
Single Mode 9m 1550nm 0.3 dB 0.22 dB 0.75 dB 0.1 dB











Note: (Fiber Attenuation /km in above table)
1. These values are per TIA/EIA and other industry specifications
2. These values are one example of the performance that can be obtained with a new fiber installation