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Optical Communication Technology

The study of all-optical quantization scheme based on slicing supercuntiuum spectrum

Shuxian Zhang

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

All-optical analog-to-digital conversion play an important role in optical communication,it can realize the high sampling-rate,high bit-resolution by using photonic-electronic technology.All-opical quantization is a key module in all-optical analog-to-digital conversion which determine speed and resolution of the conversion directly.In this paper,we purpose a new scheme of all-optical quantization based on slicing supercontiuum spectrum and design a testifying optical circuit for simulating.The results show that the scheme is efficient for all-optical quantization.

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All-optical analog-to-digital conversion play an important role in optical communication,it can realize the high sampling-rate,high bit-resolution by using photonic-electronic technology.All-opical quantization is a key module in all-optical analog-to-digital conversion which determine speed and resolution of the conversion directly.In this paper,we purpose a new scheme of all-optical quantization based on slicing supercontiuum spectrum and design a testifying optical circuit for simulating.The results show that the scheme is efficient for all-optical quantization.
A hybrid analog-to-digital converter is described that uses photonic waveform sampling coupled with superconducting electronics for quantization and conversion to a binary format. The architecture scheme exploits extremely low clock jitter, amplitude stability, and a picosecond sampling aperture from the photonic system and magnetic flux quantization and high-speed digital logic in the superconducting system. The operational speed of the conversion is primarily limited by the maximum speed of the superconducting logic elements.
All-optical analog-to-digital conversion is a paramount issue in modern science. How to implement real-time and ultrafast quantization to optical pulses with different intensities in an all-optical domain is a central problem. Here, we report a real-time demonstration of an all-optical quantization scheme based on slicing the supercontinuum in a nonlinear fiber. In comparison with previous schemes through off-line analysis of the power of different optical spectral components in the supercontinuum, this, to the best of our knowledge, is the first demonstration of such functionality online in the time domain. Moreover, the extinction ratio among the quantized outputs can exceed 10 dB, which further confirms the feasibility of the proposed quantization scheme. The current 3 bit resolution in the proof-of-principle experiment is limited by the current experimental condition, but it can be expected to be greatly enhanced through improving both the spectral width of the generated supercontinuum and the number of filtering channels used.
We propose a possible application of a high-speed flash type single flux quantum (SFQ) analogue-to-digital converter (ADC) to optical communication systems and their measuring instruments. One of the problems in optical networks is the chromatic dispersion over a standard single mode fiber, which has to be recovered by optical dispersion compensation. Recently, there has been great interest in 100-Gbit/s Ethernet technologies as next generation optical networks in which chromatic dispersion is more severe. Among several types of architectures, digital coherent optical communication system is a promising technology. Correction of the dispersion is performed electrically after digital conversion without any optical compensation, which would ease system construction. Digital storage oscilloscopes with high-speed ADCs are crucial for investigating the architecture and for constructing 100-GbE systems. A flash-type SFQ ADC is attractive for its high-speed sampling clock capability, especially as an instrument for a digital coherent receiver. The maximum operating frequency of the comparator in ADCs was studied by simulation for various critical current densities (Jc). The simulation suggested that using Jcof 20-40 kA/cm2enables the comparator to operate at a clock frequency of more than 100 GHz. An O/E converter, a uni-traveling-carrier photodiode, operable at low-temperature, has been developed and 40-GHz operation was confirmed at 5 K. We have also designed a 1-bit slice of a superconducting quantum interference device-(SQUID) wheel-type ADC and its test circuit including a doubler circuit and two driver types.
Ultrafast switching speed, low power, natural quantization of magnetic flux, quantum accuracy, and low noise of cryogenic superconductor circuits enable fast and accurate data conversion between the analog and digital domains. Based on rapid single-flux quantum (RSFQ) logic, these integrated circuits are capable of achieving performance levels unattainable by any other technology. Two major classes of superconductor analog-to-digital converters (ADCs) are being developed - Nyquist sampling and oversampling converters. Complete systems with digital sampling at rates of /spl sim/20 GHz and above have been demonstrated using low-temperature superconductor device technology. Some ADC components have also been implemented using high-temperature superconductors. Superconductor ADCs have unique applications in true digital-RF communications, broadband instrumentation, and digital sensor readout. Their designs, test results, and future development trends are reviewed.