Abstract
As a promising technology for broadband communication, passive optical network (PON) has been deployed to support the last-mile broadband access network. In particular, time-division-multiplexing PON (TDM-PON) has been widely used owing to its mature technology and low cost. To practically implement TDM-PONs, the combination of intensity modulation and direct detection is a very promising technique because it achieves cost reduction in system installation and maintenance. However, the current intensity-modulation and direct-detection TDM-PON still suffers from some problems, which mainly include a high-power penalty, detrimental Brillouin backscattering (BB), and so on. Thus, using directly modulated lasers (DMLs) and colorless optical network units (ONUs), respectively, two intensity-modulation and direct-detection TDM-PON architectures are proposed. Using VPI (an optical simulation software developed by VPIphotonics company) simulators, we first analyze the influences on DML-based intensity-modulation and direct-detection TDM-PON (system 1) performances, which mainly include bit error rate (BER) and power penalty. Next, the BB effect on the BER of the intensity-modulation and direct-detection TDM-PON that uses colorless ONUs (system 2) is also investigated. The simulation results show that: (1) a low-power penalty is achieved without degrading the BER of system 1, and (2) the BB can be effectively reduced using phase modulation of the optical carrier in system 2.
Highlights
The last-mile broadband access network has faced severe design challenges as new bandwidth-hungry applications are constantly emerging
To solve the aforementioned problems, these two systems are established via VPI simulators[18] as follows: (1) we analyze the influence on the system 1 performances, which mainly includes the bit error rate (BER) and power penalty, and a lowpower penalty is guaranteed without degrading the BER of system 1, and (2) using an empty carrier generated by an optical linear terminal (OLT) along with the downstream signal for upstream transmission, we achieve a colorless optical network units (ONUs) in system 2
We investigate the effect of Brillouin backscattering (BB) on the BER of system 2
Summary
The last-mile broadband access network has faced severe design challenges as new bandwidth-hungry applications (e.g., online games, and so on) are constantly emerging. The increased transmission distance and splitter ratio incurs highinsertion loss Mitigating this power penalty is a major challenge. One laser source in its transmitter, which increases the system cost and complexity For this end, intensity-modulation and direct-detection TDM-PON using a colorless ONU (system 2) was developed. To solve the aforementioned problems, these two systems are established via VPI simulators[18] as follows: (1) we analyze the influence on the system 1 performances, which mainly includes the BER and power penalty, and a lowpower penalty is guaranteed without degrading the BER of system 1, and (2) using an empty carrier generated by an OLT along with the downstream signal for upstream transmission, we achieve a colorless ONU in system 2.
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