A 10Gb/s transmitter module containing an electroabsorption modulator monolithically integrated with a distributed feedback (DFB) semiconductor laser is fabricated using the identical epitaxial layer scheme.Gain-coupl...A 10Gb/s transmitter module containing an electroabsorption modulator monolithically integrated with a distributed feedback (DFB) semiconductor laser is fabricated using the identical epitaxial layer scheme.Gain-coupling mechanism is employed to improve the single mode yield of the DFB laser,while inductively coupled plasma dry etching technique is utilized to reduce the modulator capacitance.The integrated device exhibits a threshold current as low as 12mA and an extinction ratio over 15dB at -2V bias.The small signal modulation bandwidth is measured to be over 10GHz.The transmission experiment at 10Gb/s indicates a power penalty less than 1dB at a bit-error-rate of 10 -12 after transmission through 35km single mode fiber.展开更多
Deep InP gratings are etched by C12/CH4/Ar inductively coupled plasma （ICP） at room temperature. A comparison is made between SiNz mask patterns formed by wet and dry etching. SF6 reactive ion etching is adopted for...Deep InP gratings are etched by C12/CH4/Ar inductively coupled plasma （ICP） at room temperature. A comparison is made between SiNz mask patterns formed by wet and dry etching. SF6 reactive ion etching is adopted for smooth and vertical sidewall. The etching conditions of C12/CH4/Ar ICP are optimized for high anisotropy, and a 1.7-μm-deep InP grating with an aspect ratio of 10：1 is demonstrated. The technique is then used for the fabrication of 1.55-μm laterally coupled distributed feedback A1GMnAs-InP laser.展开更多
数字电视接收机抗脉冲干扰(TII,Tolerance to Impulsive Interference)测试是数字电视系统测试的一个重要组成部分,传统的抗脉冲噪声测试采用简单的对AWGN噪声门取样(GAWGN,GatedAWGN)的方式实现,但是实际物理环境中的脉冲噪声十分复杂...数字电视接收机抗脉冲干扰(TII,Tolerance to Impulsive Interference)测试是数字电视系统测试的一个重要组成部分,传统的抗脉冲噪声测试采用简单的对AWGN噪声门取样(GAWGN,GatedAWGN)的方式实现,但是实际物理环境中的脉冲噪声十分复杂,单纯基于GAWGN,测试是不完善的,尤其对于基于OFDM调制的地面数字电视系统。本文介绍了欧洲DTG(Digital TV Group)组织关于脉冲噪声干扰(II,Impulsive Interference)的研究成果——二次AWGN门取样(G2AWGN Gated-squared AWGN)[1]以及与GAWGN的区别,同时阐述了单载波和多载波调制系统在抗脉冲干扰测试中的不同,并且基于罗德与施瓦茨公司(R&S)的广播电视测试系统SFU提出了完备的抗脉冲干扰测试方案[2]。展开更多
文摘A 10Gb/s transmitter module containing an electroabsorption modulator monolithically integrated with a distributed feedback (DFB) semiconductor laser is fabricated using the identical epitaxial layer scheme.Gain-coupling mechanism is employed to improve the single mode yield of the DFB laser,while inductively coupled plasma dry etching technique is utilized to reduce the modulator capacitance.The integrated device exhibits a threshold current as low as 12mA and an extinction ratio over 15dB at -2V bias.The small signal modulation bandwidth is measured to be over 10GHz.The transmission experiment at 10Gb/s indicates a power penalty less than 1dB at a bit-error-rate of 10 -12 after transmission through 35km single mode fiber.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60244001 and 60536020, the National High Technology Research and Development Programme of China under Grant No 2001AA313130, and the Major State Basic Research Project of China under Grant No TG2000036601.
文摘Deep InP gratings are etched by C12/CH4/Ar inductively coupled plasma （ICP） at room temperature. A comparison is made between SiNz mask patterns formed by wet and dry etching. SF6 reactive ion etching is adopted for smooth and vertical sidewall. The etching conditions of C12/CH4/Ar ICP are optimized for high anisotropy, and a 1.7-μm-deep InP grating with an aspect ratio of 10：1 is demonstrated. The technique is then used for the fabrication of 1.55-μm laterally coupled distributed feedback A1GMnAs-InP laser.
文摘数字电视接收机抗脉冲干扰(TII,Tolerance to Impulsive Interference)测试是数字电视系统测试的一个重要组成部分,传统的抗脉冲噪声测试采用简单的对AWGN噪声门取样(GAWGN,GatedAWGN)的方式实现,但是实际物理环境中的脉冲噪声十分复杂,单纯基于GAWGN,测试是不完善的,尤其对于基于OFDM调制的地面数字电视系统。本文介绍了欧洲DTG(Digital TV Group)组织关于脉冲噪声干扰(II,Impulsive Interference)的研究成果——二次AWGN门取样(G2AWGN Gated-squared AWGN)[1]以及与GAWGN的区别,同时阐述了单载波和多载波调制系统在抗脉冲干扰测试中的不同,并且基于罗德与施瓦茨公司(R&S)的广播电视测试系统SFU提出了完备的抗脉冲干扰测试方案[2]。
