Dynamic optical arbitrary waveform shaping based on cascaded optical modulators of single FBG

Area of Science:

• Photonics and Optical Engineering
• Signal Processing
• Waveform Generation

Background:

• Arbitrary waveform generation is crucial for advanced optical systems.
• Existing methods often lack independent control over amplitude and phase.
• Fiber Bragg Gratings (FBGs) offer precise spectral filtering capabilities.

Purpose of the Study:

• To propose and investigate a novel dynamic optical arbitrary waveform generation (O-AWG) scheme.
• To achieve independent amplitude and phase control for optical waveforms.
• To demonstrate the generation of complex optical pulse trains with tunable parameters.

Main Methods:

• Utilized a system with multiple optical modulators (O-MODs) incorporating uniform Fiber Bragg Gratings (FBGs).
• Employed Mach-Zehnder Interferometer (MZI) structures with fiber stretchers (FSs) for amplitude control via interference.
• Implemented a second FS within the O-MOD for independent phase manipulation.
• Investigated the scheme through detailed simulations.

Main Results:

• Successfully demonstrated independent control of amplitude and phase in the proposed O-AWG.
• Generated optical pulse trains with diverse and arbitrary waveforms.
• Achieved control over nonuniform pulse intensity, spacing, and width within pulse trains.
• Validated the flexibility through FS adjustments altering phase shifts.

Conclusions:

• The proposed O-AWG scheme based on FBGs and MZI offers a powerful method for dynamic waveform generation.
• Independent amplitude and phase control enables the creation of highly customizable optical pulse trains.
• This technique holds potential for applications requiring complex optical signal manipulation.