Optical transfer linearity using test tones

摘要

An optical system may have an optical transmitter including a digital signal processor to receive a signal channel, determine a digital signal associated with the signal channel based on information in a look-up table and based on a test 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 optical system may also have a photodiode to convert the modulated optical signal to a digital signal, a tone detector to detect the test tone based on the digital signal, and a controller to modify the information in the look-up table based on the test tone.

主权项

1. An optical system, comprising:
an optical transmitter including: a digital signal processor (DSP) configured to: receive a signal channel, determine a digital signal associated with the signal channel based on information in a look-up table and based on a test tone, 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; and a 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;
a photodiode unit configured to convert the modulated optical signal to a photodiode unit output signal; a tone detector configured to detect the test tone based on the photodiode unit output signal; and a controller configured to modify the information in the look-up table based on the test tone.