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How to adjust the eye diagram of an optical module

Fiber and communications infrastructure knowledge brief Published 01 Feb 2025

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Adjusting an optical module's eye diagram involves optimizing signal amplitude, timing, and jitter to maximize eye height and width while minimizing noise and intersymbol interference.

Understanding Eye Diagram Parameters

An eye diagram visually represents the quality of a digital optical signal by overlaying multiple bit sequences on an oscilloscope display. Key parameters include: Eye Height: Vertical distance between logic “1” and “0” levels, indicating noise tolerance. A larger eye height improves signal clarity and resistance to interference.

Eye Width: Horizontal opening of the eye, reflecting timing margin and jitter. Wider eyes indicate better timing stability. Jitter: Horizontal blurring at transitions, caused by timing variations.

Reducing jitter improves the eye opening. Extinction Ratio: Ratio of optical power between logic “1” and “0”, affecting signal contrast.

Steps to Adjust the Eye Diagram

Use Proper Triggering: Trigger the oscilloscope or BERT on a synchronous clock signal rather than the incoming data to reduce pattern-dependent jitter and improve measurement accuracy. Optimize Transmitter Settings: Adjust the optical module's output power, pre-emphasis, or equalization settings to increase eye height and reduce amplitude noise. Minimize Dispersion and Interference: Ensure the fiber link is properly terminated and free from reflections or impedance mismatches.

Use dispersion compensation if necessary to reduce intersymbol interference. Adjust Receiver Parameters: Fine-tune the receiver's decision threshold, gain, and equalization to maximize the eye opening and reduce bit errors.

Use Eye/

Mask Mode: Many oscilloscopes provide Eye/Mask Mode to measure eye diagrams statistically. This mode allows you to monitor rise/fall times, jitter, and mask violations, helping guide adjustments. Iterative Testing: After each adjustment, capture the eye diagram and check against the eye mask.

Repeat until the eye is sufficiently open and meets the required standards.

Practical Tips

Ensure the test pattern (e.g., PRBS) is long enough to reveal worst-case signal behavior. Monitor both vertical and horizontal eye openings simultaneously to balance amplitude and timing margins. Document settings and results to maintain reproducibility in production or R&D environments.

By systematically adjusting transmitter and receiver parameters, minimizing noise and dispersion, and using proper oscilloscope techniques, you can optimize the eye diagram of an optical module, ensuring reliable high-speed data transmission and compliance with industry standards.

How to adjust the eye diagram of an optical module - ENSAA OPTICAL NETWORKS [PDF]

How to adjust the eye diagram of an optical module

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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