High Frequency Signals & BNC Cables: Explained

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SUMMARY

BNC cables are designed to transmit high-frequency signals effectively, which is crucial for applications involving diode lasers and photodiodes. While the voltage supplied to devices like diode controllers may be direct current (DC), the term "high frequency" refers to the rapid changes in the signal that can occur, particularly in pulsed or modulated signals. BNC cables excel in shielding against external interference, making them suitable for high-frequency applications. Understanding the frequency response of BNC cables is essential for optimizing signal integrity in electronic setups.

PREREQUISITES
  • Understanding of signal frequency and modulation techniques
  • Familiarity with BNC cable specifications and applications
  • Knowledge of coaxial cable characteristics and performance
  • Basic principles of electronic signal transmission
NEXT STEPS
  • Research BNC cable specifications for high-frequency applications
  • Learn about signal modulation techniques used in laser applications
  • Explore the frequency response of coaxial cables and their cutoff frequencies
  • Investigate the differences between twisted pair and coaxial cable transmission
USEFUL FOR

Electronics engineers, technicians working with laser systems, and anyone involved in high-frequency signal transmission and measurement will benefit from this discussion.

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Hihi,

I don't understand what is the meaning that BNC cable transfer high frequency signal?

For example, I use BNC cable for the connection between my diode controller to the diode laser. I also use BNC cable to connect my photodiode to the oscilloscope.

I'm not sure what is the meaning of high frequency signal here? Is the signal transmitting has high frequency? but the voltage to my diode is a direct current, so where comes the frequency?? a bit confused.

I know the BNC cable can shield away from picking up radio signal and antennas from somewhere else, but what is high frequency mean here? Can it transmit low frequency?
 
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Coax can be used from DC to its cutoff frequency, although its loss can be significant well before its cutoff frequency.

Twisted pair makes a fine transmission line too, but does not have the self-shielding feature of coax.
 

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