Optical transmitter, optical transmission method and optical transmission system
A technology of optical transmitter and optical receiver, which is applied in the field of optical communication, can solve problems such as increasing the complexity of FSK modulators, and achieve the effects of simple structure, overcoming performance degradation, and easy implementation
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[0046] When the channel transmission rate of the system rises above 40Gbit / s, the higher the utilization rate of network bandwidth, the longer the transmission distance, and the greater the transmission damage caused by the nonlinear effect of optical fiber. For ASK modulated signals, the optical signal-to-noise ratio of the receiver (hereinafter referred to as: OSNR) has a linear relationship with the fiber input power, while the nonlinear effect of the fiber has a super-linear relationship with the fiber input power. By increasing the fiber input power, the The method of improving OSNR will not work. Therefore, the nonlinear effect of optical fiber has become a fatal factor that restricts the improvement of network system bandwidth and the extension of transmission distance. Advanced modulation methods such as Differential Phase Shift Keying (hereinafter referred to as DPSK) and Frequency Shift Keying (hereinafter referred to as FSK) have begun to show the superiority of hig...
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