| 摘要 |
An optical system may have an optical transmitter including a digital signal processor to receive a signal channel, add data corresponding to a pilot tone, generate a digital signal associated with the signal channel and including the pilot tone, and output the digital signal. The optical system may further have a digital-to-analog converter to convert the digital signal to an analog signal, a laser to provide an optical signal, and a modulator to receive the optical signal and the analog signal, and modulate the optical signal based on the analog signal to form a modulated optical signal. The modulated optical signal may include the pilot tone. The optical system may also have an optical receiver to receive the modulated optical signal, process the modulated optical signal to determine a phase associated with the pilot tone, and apply the phase to the modulated optical signal to recover the signal channel. |
| 主权项 |
1. An optical system comprising:
an optical transmitter including:
a digital signal processor (DSP) configured to receive a signal channel, add data corresponding to a pilot tone having a phase, generate a digital signal associated with the signal channel, and output the digital signal,a digital-to-analog converter (DAC) configured to convert the digital signal to an analog signal,a laser configured to provide an optical signal, anda modulator configured to receive the optical signal and the analog signal, and modulate the optical signal based on the analog signal to form a modulated optical signal,
the modulated optical signal including the pilot tone; and an optical receiver configured to:
receive the modulated optical signal,process the modulated optical signal to determine the phase associated with the pilot tone, andapply the phase to the modulated optical signal to recover the signal channel,where the DSP is a first DSP, the digital signal is a first digital signal, the laser is a first laser, and the optical signal is a first optical signal, the optical receiver including: a second laser configured to provide a second optical signal; a coupler configured to receive the second optical signal and the modulated optical signal, and to provide a third optical signal based on the second optical signal and the modulated optical signal; a detector configured to receive the third optical signal and provide an electrical signal corresponding to the third optical signal or corresponding to the modulated optical signal; an analog-to-digital converter (ADC) configured to receive the electrical signal and convert the electrical signal to a second digital signal; and a second DSP configured to receive the second digital signal, process the second digital signal to determine the phase associated with the pilot tone, apply the phase to the second digital signal, to recover the signal channel, and output the recovered signal channel,
where the optical receiver processing the modulated optical signal and applying the phase corresponds to the second DSP processing the second digital signal and applying the phase. |
