Related Experiment Videos
Tm3+ cladding-doped fiber for selective wavelength filtering in high-power pump lasers
Monica K Davis1, Matthew J Dejneka, Jim Ainslie
1Corning, Inc., Corning, New York 14831, USA. monica.k.davis@stanfordalumni.org
Optics Letters
|April 10, 2004
Summary
Multiple path interference (MPI) in fiber amplifiers increases bit-error rates. A new passive method using a Tm3+-doped fiber pigtail significantly reduces MPI from pump lasers, improving signal integrity.
Area of Science:
- Optoelectronics
- Fiber optics
- Laser technology
Background:
- Scattering and reflection in fiber amplifiers lead to multiple path interference (MPI).
- MPI increases bit-error rates, degrading optical communication system performance.
- Controlling reflections from pump laser sources is crucial for signal quality.
Purpose of the Study:
- To introduce a passive method for mitigating MPI in fiber amplifiers.
- To reduce MPI originating from the front facet of a 980-nm pump laser.
- To enhance the overall performance and reliability of fiber-based communication systems.
Main Methods:
- Utilized a thulium-doped (Tm3+) fiber pigtail.
- Inserted the Tm3+-doped fiber between the pump laser diode facet and the fiber Bragg grating.
- Employed a passive optical approach, avoiding active feedback mechanisms.
Main Results:
- Successfully reduced MPI contributions from the pump laser's front facet.
- Achieved a significant reduction in optical return loss (ORL) in the C-band.
- Optical return loss was lowered to below -30 dB.
Conclusions:
- The Tm3+-doped fiber pigtail is an effective passive solution for MPI reduction.
- This method enhances the stability and performance of fiber-Bragg-grating-stabilized pump lasers.
- The technique offers a practical approach to improve bit-error rates in optical amplifiers.