Abstract
Dual wavelength laser generation has been of constant interest due to their applications in optical communications and teraheartz generation. A novel configuration for Dual-wavelength laser generation based on the use of a couple of multimode interference (MMI) filters is demonstrated in a ring cavity Erbium-doped fibre laser. The MMI filters consist of a segment of no-core fibre spliced between two SMF-28 single mode fibre segments. The MMI filters configured as a Mach-Zehnder interferometer, are used as transmission spectral filters for simultaneous generation of two laser wavelengths. An optical attenuator is used to adjust the intra-cavity losses for dual-wavelength laser generation. Laser emission at 1540.4 and 1554 nm for a wavelength separation of ~13.6 nm is obtained. The laser wavelengths output power stability variations with the applied pump power is also experimentally discussed. The use of MMI filters in the proposed dual-wavelength laser filter is experimentally demonstrated as a reliable device for dual-wavelength generation in fibre lasers.
Highlights
Dual wavelength laser generation has been of constant interest due to their applications in optical communications and teraheartz generation
The operation principle of the SMS fibre structure is based on a self-imaging phenomenon described for slab waveguides by Soldano and Penings [1]
The filtering aspects of the SMS fibre structure was discussed by Mohammed et al [2]
Summary
Spectral filters in optical fibre based on single-modemultimode-single-mode (SMS) fibre structure have been of significant interest as reliable optical devices because of their many advantages such as compatibility for all-fibre integration, low cost, low insertion loss and ease to fabricate. Its transmission wavelength peak can be tuned by external parameters such as temperature, strain and liquid refractive index [3, 4]. This features make the SMS fibre structure. The use of a single SMS structure in these investigations, limits the laser lines wavelength separation and make difficult the wavelength selection and the cavity losses adjustment. The reliability of using two MMI filters for separately wavelength selection of stable dual-wavelength laser operation is experimentally demonstrated
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