公开(公告)号：WO2017165067A1

公开(公告)日：2017-09-28

申请号：PCT/US2017/019262

申请日：2017-02-24

Applicant: ARRIS ENTERPRISES LLC

Inventor： WANG, Jun ,  MUTALIK, Venkatesh G. ,  SCHEMMANN, Marcel F. ,  CHASMAWALA, Shamsuddin H.

IPC: H04B10/2537 ,  H04B10/2575

Abstract: Techniques for transmitting an optical signal through optical fiber with an improved stimulated Brillouin scattering (SBS) suppression and an improved transmitters signal to noise ratio (SNR) include externally modulating a light beam emitted from a light source with a high frequency signal. The light beam is also modulated externally with an RF information-carrying signal. The high frequency signal is at least twice a highest frequency of the RF signal. The high frequency signal modulating the light source can be split, providing a portion of the split signal to a phase and gain control circuit for adjusting a phase/gain. The output of phase and gain control circuit can be applied to the external modulator to eliminate intensity modulation for SBS suppression improvement. The optical transmitters SNR is further improved by cancelling a beat between SBS suppression modulation tone and out of band distortion spectrum of information bearing RF signal.

Abstract translation: 用改进的受激布里渊散射（SBS）抑制和改进的发射机信噪比（SNR）通过光纤发射光信号的技术包括：用光源外部调制从光源发射的光束， 高频信号。 光束也通过携带RF信息的信号进行外部调制。 高频信号至少是RF信号的最高频率的两倍。 调制光源的高频信号可以被分离，将分离信号的一部分提供给用于调整相位/增益的相位和增益控制电路。 相位和增益控制电路的输出可以应用于外部调制器，以消除强度调制以改善SBS抑制。 通过消除SBS抑制调制音调和带信息的RF信号的带外失真频谱之间的差拍，进一步改善了光发射机SNR。