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Multi-band VMUX based on 2%-Δ silica platform
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DOI：10.1016/j.optlastec.2025.114643.png)
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Abstract
En 中文
The demand for compact and high-channel-number variable attenuator multiplexer (VMUX) is increasingly urgent in modern optical communication networks. Here, we demonstrate a 17-channel multi-band VMUX based on 2 %-Δ silica platform with high performance across O + S + C + L band. As the key devices of VMUX, variable optical attenuator (VOA) and array waveguide grating (AWG) are well designed and performed. Utilizing Bezier multimode interference (MMI) and single-mode filter, the VOA exhibits low insertion losses (ILes) and large attenuations with an ultrabroad band property. Specifically, the ILes and excess losses (ELes) of the VOA are lower than 3.64/0.85 dB from 1260 to 1360 nm and 6.03/0.99 dB from 1500 to 1630 nm, correspondingly, and the attenuations exceed 22.24 dB from 1260 to 1360 nm and 18.60 dB from 1500 to 1630 nm. On the other hand, the IL of AWG is lower than 4.4 dB in S + C + L band. The adjacent channel crosstalk is lower than −27 dB. Finally, we demonstrate and perform of the VMUX consists of the above devices. In the O, S, C and L bands, the ILes/ELes of VMUX are lower than 6.29/3.88 dB, 6.90/3.14 dB, 7.21/3.31 dB and 7.17/3.22 dB, respectively. The nonuniformity is lower than 1.3 dB. The adjacent, non-adjacent, and total crosstalk are lower than −29.1 dB, −27.9 dB and −21.3 dB in four bands, respectively. In O-band, all channels realize the attenuation range from 0∼27 dB, and the maximum attenuation is 34.94 dB. In C-band, all channel can realize the attenuation range from 0 to 29 dB, and the maximum attenuation is 39.30 dB. The transmission experiments of 30 Gbaud in O + S + C + L band are successfully realized.
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