通过谱-时间酉变换产生多波长任意波形
Multi-wavelength arbitrary waveform generation through spectro-temporal unitary transformations
摘要：
时间波形操纵是光学中的基本功能，对于光通信、微波光子学和量子光学等应用至关重要。传统的IQ或相位振幅调制器通过从输入光波中分割能量来对光进行整形，因此基本上是有损耗的，并且不能同时对多个输入波长应用独立调制。从时空对偶性的启发，我们产生任意酉谱时变换的多个时间输入矢量的调制结构，仅包括无损相位调制和色散全通滤波。输出波形的带宽不受驱动电子器件的限制，并且可以同时对多个正交输入（例如频谱分离的频率音调）执行独立变换。这克服了传统的电光调制器的主要局限性，并提供了基本的新的洞察时间波操纵。
英文摘要：
Temporal waveform manipulation is a fundamental functionality in optics and crucial for applications like optical communications, microwave photonics and quantum optics. Traditional IQ- or phase-amplitude modulators shape light by carving energy from the input lightwave and are thus fundamentally lossy, and cannot apply independent modulation to multiple input wavelengths simultaneously. Taking inspiration from the space-time duality, we produce arbitrary unitary spectro-temporal transformations on multiple temporal input vectors with a modulation structure comprising of only lossless phase modulation and dispersive allpass filtering. The bandwidth of the output waveforms is not restricted by the driving electronics and independent transformations can be performed simultaneously on multiple orthogonal inputs such as spectrally separated frequency tones. This overcomes the main limitations of traditional electro-optic modulators and offers fundamental new insight into temporal wave manipulation.
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