Sil-Gu Mun

Real-time demonstration of QoS guaranteed 25-Gb/s PON prototype with Ethernet-PON MAC/PHY and cost-effective APD receivers for 100-Gb/s access networks.

We demonstrate a real-time 25-Gb/s PON prototype with ethernet-PON MAC/PHY, O-band transmitter, and cost-effective APD receivers. With applying parasitic inductance and capacitance reduction, the frequency response of 25-Gb/s APD ROSA with TO46-pacakge is improved to support high receiver sensitivity around -25 dBm at the BER of 10-3. The 30 dB power budget of 25 Gb/s downstream is achieved at the BER of 10-3. With long-term ethernet packet transmission, 25 Gigabit and 10 Gigabit ethernet traffics are successfully transmitted through the 20-km SMF over 14 hours observation window. Furthermore, QoS and bandwidth re-assignment function of the 25-Gb/s PON prototype are successfully demonstrated with respect to residential, business and mobile backhaul services in ONUs.

Compactly packaged monolithic four-wavelength VCSEL array with 100-GHz wavelength spacing for future-proof mobile fronthaul transport

We report a cost-effective transmitter optical sub-assembly using a monolithic four-wavelength vertical-cavity surface-emitting laser (VCSEL) array with 100-GHz wavelength spacing for future-proof mobile fronthaul transport using the data rate of common public radio interface option 6. The wavelength spacing is achieved using selectively etched cavity control layers and fine current adjustment. The differences in operating current and output power for maintaining the wavelength spacing of four VCSELs are <1.4 mA and <1 dB, respectively. Stable operation performance without mode hopping is observed, and error-free transmission under direct modulation is demonstrated over a 20-km single-mode fiber without any dispersion-compensation techniques.

Cost effective VCSEL array based 80-Gb/s TOSA for NG-PON2

The 8×10 Gb/s TOSA based on a VCSEL array was successfully developed for NG-PON2 application. For the cost effectiveness, direct optical coupling without lens array was used to package the TOSA. We have found that an optical and electrical crosstalk was small enough not to effect on a transmission performance.

Wavelength initialization technique for colorless gigabit WDM-PON

A new wavelength initialization technique is proposed for colorless gigabit wavelength division multiplexed-passive optical network (WDM-PON). It helps us reduce the time looking for the allocated channel independent of the number of channel of WDM-PON. This method is divided into two steps. First step is searching for wavelength band and second step is searching for a fine channel in wavelength band. The results of each step show that wavelength initialization time can be fixed independent on WDM-PON channels.

Booting process technology for wavelength initialization in WDM-PON OLT and ONT

We propose a booting process related to a wavelength initialization of light source of optical line terminal (OLT) and optical network terminal (ONT) in wavelength division multiplexing passive optical network (WDM-PON). A stable operation of wavelength initialization is observed for OLT and ONT optical transceiver. The proposed process use minimized optical devices such as filter and photo diode (PD) for wavelength initialization.