Frequency-comb-referenced multi-channel fiber laser for DWDM communication

Area of Science:

• Photonics
• Optical Communications
• Laser Physics

Background:

• Dense Wavelength Division Multiplexing (DWDM) systems require highly stable and accurate optical channels.
• Environmental disturbances can degrade the performance of existing optical communication systems.
• Precise wavelength generation is crucial for increasing data transmission capacity.

Purpose of the Study:

• To propose and demonstrate an all-fiber-based optical scheme for simultaneous generation of multiple continuous-wave (CW) laser wavelengths.
• To stabilize these generated wavelengths to a femtosecond laser's frequency comb.
• To enhance the transmission capacity and reliability of DWDM communications.

Main Methods:

• An all-fiber optical setup was designed for multi-channel wavelength generation.
• A femtosecond laser's frequency comb was used for precise wavelength stabilization.
• Environmental immunity was a key design consideration for the proposed scheme.

Main Results:

• Multiple CW laser wavelengths were simultaneously generated over a 5 THz spectral range around 1550 nm.
• Each generated wavelength exhibited a narrow linewidth (< 24 kHz).
• An absolute position uncertainty of approximately 2.24 × 10⁻¹² (10 s averaging) was achieved, traceable to an atomic Rubidium (Rb) clock.

Conclusions:

• The proposed all-fiber scheme successfully generates multiple stabilized, narrow-linewidth optical channels.
• This technology offers high accuracy and immunity to environmental disturbances, suitable for advanced DWDM systems.
• The demonstrated system has the potential to significantly enhance optical communication transmission capacity.