Abstract
We report 108 Gb/s Duo-Binary PAM-8 (DB-PAM-8) transmission using direct-detection aided by Volterra equalizer. The bit-error-rate (BER) performance of the DB-PAM-8 signal has been evaluated through error counting by varying the bit rate, received optical power, and reach. The experimental results suggest that up to 108, 102, and 84 Gb/s signals can be propagated in back-to-back (B2B), and over 10, and 20 km of standard single-mode fiber (SMF), respectively, below the low-density parity-check forward error correction (LDPC-FEC) threshold. Furthermore, we derive a probabilistic model of the BER for multilevel DB-PAM-M signaling that is verified using our measurements. The model of this important performance metric turned out to be accurate enough, especially at low BER values, where its use is more convenient.
Highlights
To meet the ever-increasing bandwidth demand fueled by the emerging cloud and mobile applications, the capacity of short-reach optical communication network needs a significant increase [1]– [3]
We report 108 Gb/s Duo-Binary pulse amplitude modulation (PAM)-8 (DB-PAM-8) transmission using directdetection aided by Volterra equalizer
Bit rates of 108, 103, and 85 Gb/s are achieved below the LDPC-FEC threshold, and 93, 83, and 73 Gb/s are achieved below the hard-decision FEC (HD-FEC) threshold in B2B, and after 10 and 20 km propagation, respectively
Summary
To meet the ever-increasing bandwidth demand fueled by the emerging cloud and mobile applications, the capacity of short-reach optical communication network needs a significant increase [1]– [3]. High-order modulation formats such as PAM-4 and PAM-8 provide better spectral efficiency and increased capacity per channel. This allows the use of low-bandwidth opto-electronic components to achieve higher capacity. A major source of the transmission impairment is the electrical and opto-electronic bandwidth limitation of the components, including digital-to-analog coverters (DACs), RF amplifiers, modulators, and photodetectors. Inter-symbol interference (ISI) is introduced due to the bandwidth limitation of these components. Another source of distortion is the nonlinearity of the RF amplifiers and the MZMs [16]. For high-order modulation formats such as PAM-8, the impact is more pronounced due to the reduced distance between symbols (amplitude levels)
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