负反馈提高高阻恒流源驱动的LED的输出光场噪声压缩量

ENHANCING THE NUMBER-NOISE SQUEEZING OF OUTPUT LIGHT OF A LED DRIVEN BY HIGH-IMPEDANCE CONSTANT-CURRENT SOURCE USING NEGATIVE FEEDBACK

研究高阻恒流源驱动的ＬＥＤ所发射光场的粒子数噪声压缩与ＬＥＤ电、光量子效率，漏电流效应，光子流涨落负反馈及噪声频率的关系。指出：在高阻恒流ＬＥＤ中引入适量光子流涨落负反馈能产生粒子数压缩态光场并极大地提高粒子数噪声压缩，其理想压缩仅受限于高阻恒流源残余噪声、ＬＥＤ漏电流效应和量子效率。

In this paper,we study the relations between the number-noise squeezing of the output light of a LED driven by high-impedance constant-current source and LED’selectronic/ optical quantum efficiencies,leakage current effect,negative feedback ofphoton-flux fluctuation and noise frequency.We poiat out that with appropriatenegative-feedback of the photon-flux fluctuation,LED driven by higk一impedanceconstant-current can generate number-squeezed state light,the number-noise squee-zing is significantly enhanced and its ideal value is limited only by residual noiseof the high impedance constant-current source,LED’s leakage current effect andquantum efficiency.