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We demonstrate evanescently-coupled waveguide modified uni-traveling-carrier (MUTC) photodiodes with more than 105 GHz bandwidth. The photodiodes have dark currents as low as nA and deliver RF output powers of 5.1 dBm, 4.4 dBm and 3.5 dBm at 75 GHz, 80 GHz and 90GHz, respectively.
Implementations of quantum information require single-photon detectors (SPDs) with high detection efficiency (DE) at a wavelength of 940 nm, which is a challenge for the available semiconducting SPDs. Superconducting nanowire SPDs (SNSPDs) are capable of detecting visible and near-infrared single photons with high DE. However, these detection capabilities place stringent design requirements on the...
The merits and drawbacks of stack and draw process and drilling process for a multi-core fiber were discussed. The possibility of the stack and draw process for low-loss transmission line with multi-core fiber was confirmed.
A novel analyzing model of bi-direction OTDR measurement in a hole-assisted fiber (HAF) is proposed. Using this model, both information on the air-hole structure and air-hole surface roughness in a HAF can be detected.
A scalable full QKD system using WDM and a key distillation HW engine was developed. The three-channel multiplexed system achieved the world summit level key generation rate of higher than 200 kbps with 14.5-dB transmission loss.
We developed a built-in optical input module for a superconducting single-flux-quantum (SFQ) circuit. An SFQ pulse generation could be achieved by 1550 nm band optical pulse input, whose power was less than 1 mW.
Using optical processing techniques, we experimentally enhance the physical layer security of optical communication systems. The multilevel security provided improves the confidentiality and availability of the network. We also introduce the use of optical CDMA as backup channels to achieve a bandwidth-effective way to counter physical infrastructure attacks.
We present a novel scheme of all-optical clock frequency doubling and quadrupling based on Mach-Zehnder interfering with a polarization-sensitive semiconductor optical amplifier (SOA). Then we experimentally demonstrate the frequency doubling of 5 G-bit/s optical clock signal, and quadruple 2.5 G-bit/s signal to stable short pulse train with pulse FWHH ~55 ps. Our relatively concise scheme is convenient...
We have developed an optical input module to single-flux-quantum (SFQ) circuit to realize high-speed integrated buffer memory in optical packet switch. We succeeded in demonstrating SFQ pulse generation by optical input of 100-ps pulse width.
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