Few-mode polymer waveguide amplifier with a dual-layer coronal refractive index profile.
Opt Lett
; 48(24): 6420-6423, 2023 Dec 15.
Article
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| MEDLINE
| ID: mdl-38099763
ABSTRACT
A novel, to the best of our knowledge, few-mode waveguide amplifier with a dual-layer coronal core is first proposed. Reconfiguring the refractive index profile is adopted to equalize the modal gains pumped in a single mode. The polymer in terms of the prominent advantages of simple processing and the ease of adjusting refractive index is utilized. The waveguide supporting LP01, LP11a, and LP11b is optimized by the genetic algorithm and fabricated by accurate alignment mask. The crosstalk effect and modal profiles are characterized. The modal gains with different signal power and pumping modes are revealed. The schemes in forward and backward pumps are represented. An average gain of 11.84â
dB per mode and an ultralow differential modal gain of 0.36â
dB are obtained in a 0.3â
cm waveguide at 1526â
nm through backward pumping of the LP21b mode at 240â
mW for an input signal power of 0.1â
mW.
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Opt Lett
Año:
2023
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Article