Affordable dispersion mitigation with an analog electrical filter

Area of Science:

• Optical communications
• Signal processing

Background:

• Signal dispersion limits transmission distance in optical networks.
• Existing dispersion mitigation techniques often involve costly components like dispersion-compensating fibers or complex detection schemes.

Purpose of the Study:

• To present a new, cost-effective dispersion mitigation method for simple optical networks.
• To enable longer data transmission distances in low-cost systems.

Main Methods:

• Utilizing a direct modulation scheme with a standard optical detector.
• Operating in the weak modulation regime where the dispersive channel is linear in the power domain.
• Implementing a proper electronic filter for dispersion reduction.

Main Results:

• The method avoids the need for dispersion-compensating fibers, special optical filters, coherent detection, or external modulation.
• Dispersion effects are reduced using a cost-effective electronic filter.
• On-off keying (OOK) systems achieved data transmission at 50 Gb/s over distances exceeding 40 km, a sixfold improvement over the baseline limit.

Conclusions:

• The proposed electronic filtering approach offers a viable and economical solution for dispersion mitigation in low-cost optical networks.
• This method significantly extends the reach of high-speed data transmission in systems where dispersion is a primary challenge.