Abstract
We propose to implement a 2-channel optical-time-division-multiplexed (OTDM) system for short-reach optical interconnects by using a sinusoidally modulated light source instead of a complicated mode-locked laser as an input pulse source. In this system, the OTDM signal is obtained by bit-interleaving two optical return-to-zero (RZ) signals generated by using the sinusoidally modulated light. We operate these RZ signals in the orthogonal in-phase and quadrature domains to avoid the unwanted beat components. After the transmission, the OTDM signal is detected by using single photodetector, and then processed by a 2 × 2 multiple-input multiple-output equalizer. For a demonstration, we generate 150-Gb/s OTDM signal operating in the 8-level pulse-amplitude modulated (PAM-8) format by using commercial LiNbO 3 Mach-Zehnder modulators and transmit this OTDM signal over 1.9 km of the standard single-mode fiber (SSMF). In addition, we fabricate the proposed OTDM transmitter in an integrated silicon-photonics chip and use it to demonstrate the transmission of the 64-Gb/s OTDM PAM-4 signal over 2.2 km of SSMF.
Highlights
There have been growing interests in the highspeed optical interconnects operating at >100 Gb/s/λ to cope with the rapid expansion of data traffic [1]–[7]
SUMMARY We have proposed to overcome the bandwidth limitation of the optical modulator by using a simple OTDM technique
The potential problems arising from the use of the sinusoidally modulated input light, such as the low extinction ratio (ER) and crosstalk between channels, could be mitigated by using a simple 2 × 2 multiple-input multiple output (MIMO) equalizer at the receiver
Summary
There have been growing interests in the highspeed optical interconnects operating at >100 Gb/s/λ to cope with the rapid expansion of data traffic [1]–[7]. If we assume that the number of the OTDM channels is limited to two, it would be possible to realize the OTDM transmission system by using a simple sinusoidally modulated light source instead of a mode-locked laser as an optical pulse source.
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