Converting 3 Logic Levels to 2 Logic Levels for Laser Driving Systems

In summary, the conversation discusses the need for a solution to convert signals from RJ45 Ethernet (10 BASE-T) with three logic levels (-2.5, 0, +2.5) to two logic levels in order to drive a laser on and off. The suggestion is to use an Ethernet PHY receiver to convert the signals to logic levels and the discussion also mentions the use of encoders/decoders in laser driving systems. The speed of the laser OOK modulator and the desired Ethernet signal speed are also mentioned.
  • #1
Chrisgali
1
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I need help with a mini communication project. I am trying to receive signals from RJ45 Ethernet (10 BASE-T), which comes in three logic levels (-2.5, 0, +2.5) and convert it into two logic levels so I can drive a laser on and off. Would anyone know of any IC's that can accept these signals to output 2 logic levels or vice versa (two levels --> three levels)?? Is there a specific part designed to do this?

Note: Someone said laser driving systems typically have some type of encoder/decoder that does this?
 
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  • #2
You would typically use an Ethernet PHY receiver to convert the signals on the Ethernet cable to logic levels (0V to 3.3V typically). The voltages on the Ethernet twisted pair are transformer-coupled, so that's why they are generally shown as +/-3.5V or so.

https://i.stack.imgur.com/blsP8.png
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Also, how fast is your laser OOK modulator? How fast of an Ethernet signal do you want to convert?
 

1. How does the conversion from 3 logic levels to 2 logic levels work?

The conversion from 3 logic levels to 2 logic levels for laser driving systems involves mapping three input voltage levels to two output voltage levels. This is typically done using a logic gate, such as a NAND or NOR gate, which has the ability to reduce the number of input levels to two output levels.

2. What are the benefits of converting to 2 logic levels for laser driving systems?

Converting from 3 logic levels to 2 logic levels can improve the efficiency and reliability of laser driving systems. By reducing the number of input levels, the system becomes less susceptible to noise and errors, resulting in more accurate and consistent output.

3. Are there any potential drawbacks to converting to 2 logic levels for laser driving systems?

While there are benefits to converting to 2 logic levels, there are also potential drawbacks to consider. One drawback is the loss of granularity in the output, as the system will only have two levels instead of three. This can limit the precision of the laser output in certain applications.

4. What types of lasers can benefit from 2 logic level conversion?

Most types of lasers can benefit from 2 logic level conversion, including diode lasers, fiber lasers, and solid-state lasers. However, the specific benefits and drawbacks may vary depending on the type of laser and its application. It's important to consider the specific needs of the laser system before deciding whether to convert to 2 logic levels.

5. Is it possible to convert back to 3 logic levels if needed?

Yes, it is possible to convert back to 3 logic levels if needed. However, this would require additional components and circuitry, and may not be necessary unless there is a specific need for three input voltage levels. It's important to carefully consider the requirements and limitations of the laser driving system before making any changes to the logic levels.

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