Fourier pulse-shaper-based high-order differential group delay emulator

Area of Science:

• Optics and Photonics
• Optical Communications
• Signal Processing

Background:

• Differential Group Delay (DGD) is a critical parameter in optical fiber communication systems, causing signal distortion.
• Accurate emulation of frequency-dependent DGD is essential for testing and characterizing optical components and systems.
• Existing DGD emulation techniques often lack flexibility or precision in controlling the frequency profile.

Purpose of the Study:

• To demonstrate a novel Fourier pulse-shaper-based emulator for programmable frequency-dependent DGD.
• To achieve a wide DGD range with high accuracy.
• To validate the emulator's performance against numerical simulations.

Main Methods:

• Utilizing a Fourier pulse-shaper to precisely control the spectral phase of optical pulses.
• Programming the pulse-shaper to generate user-defined, frequency-dependent DGD profiles.
• Measuring the generated DGD using optical spectrum analysis and time-domain measurements.

Main Results:

• Successfully emulated arbitrary frequency-dependent DGD profiles.
• Achieved a DGD range of up to 400 picoseconds (ps).
• Demonstrated high accuracy with a DGD error of less than 1 ps.

Conclusions:

• The Fourier pulse-shaper-based DGD emulator offers unprecedented programmability and accuracy.
• This technology enables advanced testing and characterization of optical communication systems under realistic DGD conditions.
• The emulator's performance is well-validated by its agreement with numerical simulations.