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The transmission capacity of Ethernet has grown rapidly. Advanced multilevel modulation schemes, such as a 4-level pulse amplitude modulation (PAM4), are being investigated as to their suitability for next-generation 400GbE. The demand is now high for a transmitter front-end with a low-power laser diode (LD) driver that is applicable to such multilevel modulations. To meet this demand, we devised...
A nine-channel optical frequency comb block is successfully generated by using an InP-based Mach–Zehnder modulator. The intensity deviation of the comb block is measured to be 4.9 dB, which agrees with the predicted value by numerical analysis. The wavelength of the comb block can be tuned from 1525 to 1565 nm successfully with constant RF modulation signal amplitude. It is achieved by simply controlling...
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