Simple, inexpensive wavemeter implemented with a fused fiber coupler

Area of Science:

• Photonics and Optical Engineering
• Metrology and Instrumentation

Background:

• Accurate wavelength measurement is crucial for optical fiber communication systems.
• Existing wavemeters can be complex and expensive for certain applications.

Purpose of the Study:

• To develop a simple, inexpensive wavemeter for optical fiber coupled light sources.
• To demonstrate the feasibility of using wavelength-dependent coupling coefficients for measurement.

Main Methods:

• A fused fiber coupler was utilized, exploiting its wavelength-dependent coupling coefficient.
• A prototype wavemeter was constructed and tested in the laboratory.
• Wavelength uncertainty was evaluated across a specific spectral range.

Main Results:

• The prototype wavemeter covered a wavelength range of 1500-1600 nm.
• A wavelength uncertainty of less than 0.087 nm was achieved between 1530-1570 nm.
• Amplified spontaneous emission (ASE) was identified as a primary source of error.

Conclusions:

• The developed wavemeter offers a cost-effective solution for wavelength measurement.
• Reducing ASE through band-limiting filters is expected to significantly improve accuracy.
• The device shows promise for applications requiring precise optical wavelength determination.