发明公开
EP0380242A2 Distributed feedback laser for frequency modulated communication systems
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基本信息:
- 专利标题： Distributed feedback laser for frequency modulated communication systems
- 专利标题（中）：激光切割机RückkoppelungfürFrequenzmodulierte Kommunikationssysteme。
- 申请号：EP90300558.5 申请日：1990-01-18
- 公开(公告)号：EP0380242A2 公开(公告)日：1990-08-01
- 发明人： Chraplyvy, Andrew R. , Koch, Thomas L. , Tkach, Robert W.
- 申请人： AT&T Corp.
- 申请人地址： 32 Avenue of the Americas New York, NY 10013-2412 US
- 专利权人： AT&T Corp.
- 当前专利权人： AT&T CORP.
- 当前专利权人地址： AT&T CORP.
- 代理机构： Watts, Christopher Malcolm Kelway, Dr.
- 优先权： US303594 19890127
- 主分类号： H01S3/085
- IPC分类号： H01S3/085 ; H01S3/103 ; H04B10/12
摘要：
To overcome the deleterious effects of the nonuniform frequency modulation response in semiconductor lasers due to current injection in direct frequency modulation applications, it has been determined that the linewidth enhancement factor α be made as large as possible. In one embodiment, distributed feedback lasers well suited for frequency modulation lightwave communication systems are designed to have an integrated feedback element such as a corrugation grating whose effective pitch is selected to cause the Bragg wavelength and, therefore, the laser operating wavelength to be longer than the wavelength at substantially the maximum gain or gain peak in the semiconductor structure without the grating. That is, the wavelength of the grating is effectively detuned toward the longer wavelength and lower energy side of the peak of the gain profile. Such detuning increases the linewidth enhancement factor in such a way that the nonuniform frequency modulation response and its effects are minimized and, in some cases, substantially eliminated.
摘要（中）：
为了克服由于在直接调频应用中的电流注入引起的半导体激光器中的不均匀的频率调制响应的有害影响，已经确定线宽增强因子α尽可能大。 在一个实施例中，非常适合于频率调制光波通信系统的分布反馈激光器被设计成具有集成反馈元件，例如波纹光栅，其有效间距被选择以引起布拉格波长，因此激光器工作波长比 在没有光栅的半导体结构中的基本上最大增益或增益峰值的波长。 也就是说，光栅的波长对增益曲线的峰值的较长波长和较低能量侧被有效地失谐。 这种失谐增加了线宽增强因子，使得非均匀的频率调制响应及其影响被最小化，并且在一些情况下基本上被消除。