WDM‐OFDMA‐PON uplink optical transmission using bandwidth enhanced injection‐locked FP‐LD

Abstract

We propose a scalable support WDM‐based orthogonal frequency division multiple access‐passive optical network uplink transmission system using an injection‐locked Fabry–Perot laser diode (IL‐FP‐LD). This system uses an injection‐locking technique to enhance the usable bandwidth by making stable channel states. By properly controlling the IL‐FP‐LD operation, the number of optical network units (ONU) within a wavelength can be increased, which improves the optical bandwidth efficiency for the uplink transmission. The experimental results show an enhanced modulation bandwidth of 3.5 GHz. Compared with a conventional RSOA which has a modulation bandwidth of 1.5 GHz, our scheme improves the number of ONUs that can be accommodated within a wavelength more than two times. The total discrete multitone signal received from the ONUs, with QPSK mapping on the subcarriers was 6.77 Gbps over a 23‐km standard single mode fiber transmission. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1727–1732, 2015

Design of long‐reach symmetric 1.6 Tbps bidirectional NG‐PON2 using 2D spectral/spatial SWZCC code

“…The incoming binary data bits from pseudo random bit sequence nonreturn to zero (PRBS-NRZ) at 10 Gbps per channel DN data rate, modulated with FBG1 by MZM modulated to be spectrally encode the following code sequence as shown in Table 1. 1,3,11 These incoming encoded signals are transferred to 16 × 1 array waveguide multipexer (AWG MUX) and then applied to ODN section. Here, some of the spectral components of the code sequence having wavelengths "1" are filtered out and reflected back which are then transferred to the FBG2 (having same grating number) through ODN transceivers section to offer the delay compensation.…”

“…Each transmitter section of 2D spectral SWZCC code employs continuous wave (CW) laser at 10 dBm input power, a mach zehnder modulator (MZM) and fiber Bragg grading 1 (FBG1). The incoming binary data bits from pseudo random bit sequence nonreturn to zero (PRBS‐NRZ) at 10 Gbps per channel DN data rate, modulated with FBG1 by MZM modulated to be spectrally encode the following code sequence as shown in Table 1 1,3,11 …”