Multichannel photonic Hilbert transformers (MPHTs) are reported. The devices are based on single compact spiral integrated Bragg gratings on silicon with coupling coefficients precisely modulated by the phase of each grating period. MPHTs with up to nine wavelength channels and a single-channel bandwidth of up to $\sim 625\mathrm{GHz}$ are achieved. The potential of the devices for multichannel single-sideband signal generation is suggested. The work offers a new possibility of utilizing wavelength as an extra degree of freedom in designing radio-frequency photonic signal processors. Such multichannel processors are expected to possess improved capacities and a potential to greatly benefit current widespread wavelength division multiplexed systems.

中文翻译：

---

基于复杂调制集成布拉格光栅的多通道光子希尔伯特变压器

报告了多通道光子希尔伯特变压器（MPHT）。这些器件基于硅上的单个紧凑型螺旋集成布拉格光栅，其耦合系数由每个光栅周期的相位精确调制。具有多达9个波长通道和高达1个单通道带宽的MPHT$〜625\mathrm{兆赫}$实现。建议用于多通道单边带信号生成的设备的潜力。这项工作提供了一种新的可能性，即在设计射频光子信号处理器时利用波长作为额外的自由度。预期这种多通道处理器将具有改进的容量，并有可能极大地受益于当前广泛使用的波分复用系统。