Zhao Ping, He Zonglong, Shekhawat Vijay, Karlsson Magnus, Andrekson Peter A
Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, 41296 Gothenburg, Sweden.
Nanophotonics. 2023 Jul 17;12(17):3427-3434. doi: 10.1515/nanoph-2023-0264. eCollection 2023 Aug.
All-optical wavelength conversion based on four-wave mixing attracts intense interest in many areas, especially in optical fiber communications, due to the advantages of femtosecond response, modulation-format transparency, and high flexibility in optical network management. In this paper, we present the first optical translation of 32-GBaud 16QAM signals with an integrated SiN nonlinear nanophotonic waveguide. An on-chip continuous-wave conversion efficiency of up to -0.6 dB from S band to C band is achieved in the dispersion-engineered low-loss SiN nonlinear waveguide that is back-end compatible with complementary metal-oxide-semiconductor processes. The high conversion efficiency avoids the use of external optical amplifiers for signal demodulation. The converted idler is successfully received with a sensitivity penalty of less than 0.5 dB. Moreover, pre-amplifier-free multichannel wavelength conversion of over-100-Gbps coherent signals in C band is also demonstrated using the same SiN nanophotonic waveguide via changing the pump wavelength, which shows good flexibility in all-optical signal processing. Additionally, wavelength conversion with a bandwidth over 100 nm can be expected by optimizing the current SiN nanophotonic waveguide, which is promising for commercial coherent fiber communications and has bright prospects in various areas including optical signal processing, imaging, optical spectroscopy, and quantum optics.
基于四波混频的全光波长转换由于具有飞秒响应、调制格式透明以及光网络管理高度灵活等优点，在许多领域尤其是光纤通信中引起了广泛关注。在本文中，我们展示了利用集成的SiN非线性纳米光子波导对32GBaud 16QAM信号进行的首次光转换。在与互补金属氧化物半导体工艺后端兼容的色散工程低损耗SiN非线性波导中，实现了从S波段到C波段高达-0.6dB的片上连续波转换效率。高转换效率避免了使用外部光放大器进行信号解调。转换后的闲频光以小于0.5dB的灵敏度代价成功接收。此外，通过改变泵浦波长，利用同一SiN纳米光子波导还演示了C波段中超过100Gbps相干信号的无前置放大器多通道波长转换，这在全光信号处理中显示出良好的灵活性。另外，通过优化当前的SiN纳米光子波导，有望实现带宽超过100nm的波长转换，这对于商业相干光纤通信很有前景，并且在包括光信号处理、成像、光谱学和量子光学等各个领域都有光明的前景。
