Twelve-channel LAN wavelength-division multiplexer on lithium niobate
He Jianghao,
Zhang Ming,
Liu Dajian,
Bao Yaoxin,
Li Chenlei,
Pan Bingcheng,
Huang Yishu,
Yu Zejie,
Liu Liu,
Shi Yaocheng,
Dai Daoxin
Affiliations
He Jianghao
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Zhang Ming
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Liu Dajian
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Bao Yaoxin
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Li Chenlei
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Pan Bingcheng
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Huang Yishu
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Yu Zejie
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Liu Liu
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Shi Yaocheng
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
Dai Daoxin
State Key Laboratory of Extreme Photonics and Instrumentation, Center for Optical and Electromagnetic Research, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Ningbo Innovation Center, Zhejiang University, Hangzhou310058, China
A twelve-channel local-area-network (LAN) wavelength-division multiplexing (LWDM) filter is proposed and demonstrated with a uniform channel spacing of 4.5 nm (800 GHz) in the O-band of 1270–1330 nm by using x-cut lithium-niobate-on-insulator (LNOI) photonic waveguides for the first time. The present LWDM filter consists of twelve single-channel bandpass filters based on multimode waveguide gratings (MWGs) assisted with a TE0/TE1 mode (de)multiplexer. In particular, two stages of MWGs in cascade are introduced for each single-channel bandpass filter, in order to achieve high sidelobe suppression ratios, thus reducing interchannel crosstalk. For the fabricated twelve-channel LWDM filter, all the channels have very excellent box-like spectral responses with low excess losses of ∼0.6 dB, broad 1-dB bandwidths of ∼2.9–3.4 nm (which is close to 75 % of the channel spacing), and ultra-low interchannel crosstalk of <−40 dB in experiments. In addition, the present device is highly tolerant to the random variations of the etching depth (±20 nm) and the grating waveguide width (±20 nm) of the LNOI photonic waveguides, showing great potential for high-capacity WDM systems.
