Photonic integration has long been pursued, but remains immature compared with electronics. Nanophotonics is expected to change this situation. However, despite the recent success of nanophotonic devices, there has been no demonstration of large-scale integration. Here, we describe the large-scale and dense integration of optical memories in a photonic crystal chip. To achieve this, we introduce a wavelength-addressable serial integration scheme using a simple cavity-optimization rule. We fully exploit the wavelength-division-multiplexing capability, which is the most important advantage of photonics over electronics, and achieve an extremely large wavelength-channel density. This is the first demonstration of the large-scale photonic integration of nanophotonic devices coupled to waveguides in a single chip, and also the first dense wavelength-division-multiplexing nanophotonic devices other than filters. This work paves the way for optical random-access memories and for a large-scale wavelength-division-multiplexing photonic network-on-chip.
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The authors thank T. Tamamura, H. Onji, S. Fujiura and Y. Shouji for their support in fabricating the device, H. Onji and S. Fujiura for their support in measuring the devices, and T. Sogawa and Y. Tokura for their continuous encouragement.
The authors declare no competing financial interests.
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Kuramochi, E., Nozaki, K., Shinya, A. et al. Large-scale integration of wavelength-addressable all-optical memories on a photonic crystal chip. Nature Photon 8, 474–481 (2014). https://doi.org/10.1038/nphoton.2014.93
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