光数据传输信道的比特率和空间容量限制
Limitations to bit-rate and spatial capacity of an optical data transmission channel
摘要：
平板波导的最大比特率最终由波导色散决定。我们表明，虽然波导中的最大比特率与波导的宽度成反比，但每单位宽度的比特率（即，空间容量）减小，并且在零宽度波导的极限下，它收敛到一个与波导折射率无关的值。该值在性质上等同于自由空间中每单位宽度的传输速率。我们还表明，在3D波导（例如，纤维），与自由空间不同，空间容量在相同的限制下消失。
英文摘要：
The maximum bit-rate of a slab waveguide is ultimately determined by the waveguide dispersion. We show that while the maximum bit rate in a waveguide is inversely proportional to the waveguide's width, bit rate per unit width (i.e., spatial capacity) decreases, and in the limit of a zero-width waveguide it converges to a value, which is independent of the waveguide's refractive indices. This value is qualitatively equivalent to the transmission rate per unit of width in free space. We also show that in a 3D waveguide (e.g., fibers), unlike free space, the spatial capacity vanishes in the same limit.
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