发明授权
- 专利标题: Direct modulation phase-shift-keying system and method
- 专利标题(中): 直接调制相移键控系统及方法
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申请号: US540284申请日: 1990-06-19
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公开(公告)号: US5050176A公开(公告)日: 1991-09-17
- 发明人: Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
- 申请人: Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
- 申请人地址: JPX Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX1-154664 19890619
- 主分类号: H01S3/10
- IPC分类号: H01S3/10 ; H04B10/516 ; H04B10/556 ; H04B10/61 ; H04L27/20 ; H04L27/22 ; H04L27/227 ; H04L27/233
摘要:
A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.
公开/授权文献
- US5614682A Sampling device for molten metals 公开/授权日:1997-03-25