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Electronics Letters

Low-noise optoelectronic amplifier using sub-shot noise light

P.J. Edwards

Published Feb 4, 1993• 17 citations
Publisher

Abstract

A new type of low-noise optoelectronic amplifier is proposed which uses intensity-squeezed light from a tandem array of high quantum efficiency laser diodes or light-emitting diodes. Applications include amplification of intensity-squeezed light, sub-shot noise modulated lightwave generation for free-space and fibre transmission, and low noise small signal RF amplification.

DOI
10.1049/el:19930204

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A new type of low-noise optoelectronic amplifier is proposed which uses intensity-squeezed light from a tandem array of high quantum efficiency laser diodes or light-emitting diodes. Applications include amplification of intensity-squeezed light, sub-shot noise modulated lightwave generation for free-space and fibre transmission, and low noise small signal RF amplification.
Summary form only given. Generally, light-emitting diodes (LEDs) are considered to be low-performance devices in comparison with laser diodes (LDs). However, for future applications such as the parallel inter- or intra-integrated-circuit chip optical-connections, where very low power-consumption is required for the light emitters, a LED can be a very attractive device because of the threshold-free input-output characteristics. So far, continuous efforts have been made to improve the performance of LEDs. In this paper, we focus on another very important aspect, i.e. the noise characteristics. In comparison with LDs, in general, LEDs exhibit excellent noise characteristics, particularly at low injection levels. We show that the intensity fluctuation of the output light from an LED can be squeezed below the full shot-noise (FSN) level in a wide frequency range up to 800 MHz at room temperature. Such a squeezing bandwidth, three orders of magnitude wider than that in the first report on shot-noise suppression in a LED and rather close to the widest bandwidth (1.1 GHz) obtained with LDs at 77 K has been believed to be impossible. In addition, use of a separate confinement hetero(SCH-) structure in the active region allowed us to use a moderate doping concentration (5 /spl times/ 10/sup 18/ cm/sup -3/), resulting in a sufficiently high internal quantum efficiency, /spl sim/30%.
We describe an amplifying system using a photodiode and a light emitting diode, which is able to measure and to ``recreate'' the quantum statistics of the intensity of a light beam. This system acts therefore as a nonclassical ``quantum optical repeater.'' The overall information transfer is improved by a factor of 1.8 compared to a classical device, while the ideal quantum value would be 2, and the correlation between the signal and meter outputs is 1.2 dB below the shot-noise limit. We also demonstrate the use of this device for both detecting and recreating an input squeezed state.
The low-frequency intensity noise of high-quantum-efficiency lasers or light-emitting diodes (LED's) is dominated by the pump noise. By coupling two or more semiconductor lasers (or LED's) in series with a current source, the pump noise of the two lasers will be equal, and the intensity noise of the lasers will be highly correlated. It is shown that one may generate sub-Poissonian light by measuring the intensity fluctuations of one of the beams and feeding back (or forward) the information to regulate the other photon beam. The generation scheme is shown to have much in common with intensity-correlated twin beam generation from nondegenerate optical parametric oscillators.
High quality light, whenever coherent light and nonclassical light, is more and more widely used in many filed.The coherent state behave minimum classical noise and better coherence, is mostly important light in quantum information, precise measurement and quantum metrology etc.In quantum information and quantum optics, a coherent light is used to entanglement generation (Ou, Z. et al. 1992), quantum teleportation (Furusawa, A. et al. 1998A.et al. ), quantum computation (Menicucci, N. et al. 2006) and quantum secret sharing (Lance, A. et al. 2004).The quiet laser beam, shot noise limited laser beam is important in above application.In the past 20 years there has been much interest in the generation and application of various nonclassical light sources, such as squeezed-state entanglement, quantum-correlated twin beams, and sub-poissonian light, for which improved signal-to-noise ratios and measurement precision beyond the quantum-noise limit are anticipated.In particular, subpoissonian light is a promising light source in quantum information and optical communication because of its communication capacity (