Physical Media Dependent Prototype for 10-Gigabit-Capable PON OLT

Abstract

In this work, we study the physical layer solutions for 10‐gigabit‐capable passive optical networks (PONs), particularly for an optical link terminal (OLT) including a 10‐Gbit/s electroabsorption modulated laser (EML) and a 2.5‐Gbit/s burst mode receiver (BM‐Rx) in a novel bidirectional optical subassembly (BOSA). As unique features, a bidirectional mini‐flat package and a 9‐pin TO package are developed for a 10‐gigabit‐capable PON OLT BOSA composed of a 1,577‐nm EML and a 1,270‐nm avalanche photodiode BM‐Rx, including a single‐chip burst mode integrated circuit that is integrated with a transimpedance and limiting amplifier. In the developed prototype, the 10‐Gbit/s transmitter and 2.5‐Gbit/s receiver characteristics are evaluated and compared with the physical media dependent (PMD) specifications in ITU‐T G.987.2 for XG‐PON1. By conducting the 10‐Gbit/s downstream and 2.5‐Gbit/s upstream transmission experiments, we verify that the developed 10‐gigabit‐capable PON PMD prototype can operate for extended network coverage of up to a 40‐km fiber reach.

Long-Reach Transmission Characteristics of Tunable External Cavity Laser

“…To overcome these problems, various types of WDM-PONs have been proposed. [3][4][5][6] Among them, the tunable external cavity laser (T-ECL) is an effective solution for the light source of a cost-effective WDM-PON system because it is able to reduce the fabrication cost in view of the mass production and fabrication yield. 7 8 In the previous reports, 9 the T-ECL operated successfully in the direct modulation for 2.5 Gb/s transmissions over 20 km.…”

Effects of Upstream Incoherent Crosstalk Caused by ASE Noise from Tx-Disabled ONUs in XG-PONs and TWDM-PONs

“…The transmission conversion (TC) layer of the TWDM-PON is configured using a 10G-PON (XG-PON) TC layer [3]. In time-division multiplexing passive optical networks (TDMPONs), such as the XG-PON and TWDM-PON, a burst-mode transmitter (BM-Tx) for an optical network unit (ONU) and a burst-mode receiver (BM-Rx) for an optical line terminal (OLT) require fast Tx enable/disable transient time characteristics [9]. Figure 1(a) illustrates an upstream burst transmission, which consists of a transmitter (Tx) enable transient time, burst transmission, and Tx disable transient time.…”