Jongdeog Kim

A Single-Chip 2.5-Gb/s Burst-Mode Optical Receiver With Wide Dynamic Range

In this letter, a new burst-mode optical receiver with burst detection function is proposed and a single-chip 2.5-Gb/s burst-mode optical receiver has been fabricated using 0.25-μm SiGe bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. The single-chip optical receiver has high sensitivity and wide dynamic range for various classes of power budges required in 10-Gigabit-capable passive optical network (XG-PON1) (2.5-Gb/s upstream and 10-Gb/s downstream data rates). For the 2.5-Gb/s burst-mode data streams, sensitivity and overload were -32 and -4 dBm at a bit-error rate of 10-10 , respectively, resulting in a dynamic range of 28 dB.

Real-time FPGA transmitter and receiver for coherent optical OFDM

We demonstrate a real-time FPGA implementation of coherent optical OFDM transmitter and receiver. It is implemented using two 2.5 GS/s DACs and one FPGA for transmitter, two ADCs and one FPGA for receiver, and FPGA based real-time digital signal processing for coherent optical OFDM transmission.

XG-PON1 OLT transceiver with a single-chip burst-mode receiver

We present the design and evaluation of a 10-gigabit small form factor pluggable transceiver with a prototype single-chip burst-mode receiver, a signal detection circuit, and a clock-data-recovery device for 2.5 Gbit/s upstream in the ITU-T G.987.2 recommendation.

10-Gbps electroabsorptive modulated laser bidirectional optical subassembly using novel two-window flat package for passive optical network

A novel 10-Gbps bidirectional optical subassembly (BOSA) comprised of a 1577 nm electroabsorptive modulated laser (EML) transmitter optical subassembly (TOSA) and 1270 nm avalanche photodiode (APD) receiver optical subassembly (ROSA) was developed. Here, a 10-Gbps microdevice compatible two-window flat package was proposed to simplify the EML BOSA structure, considering both the mechanical reliability and cooling performance. As a result, an optical output power of 8 dBm was obtained due to a high optical coupling efficiency of 60%, an extinction ratio of 7 dB, and a dispersion penalty at 20 km transmission of less than 1.5 dB for the EML TOSA. The APD ROSA sensitivity was -21.5 dBm at a bit error rate (BER) of 10−12 and -27 dBm at a BER of 10−3 without forward error correction. In addition, the sensitivity penalty of the APD ROSA due to signal crosstalk was less than 1.2 dB.

Single package directly modulated laser bidirectional optical subassembly using a modified mini-dual-in-line package for 10 Gbps passive optical networks

Abstract. A bidirectional optical subassembly comprised of a 2.5 Gbps distributed feedback (DFB) laser diode (LD) directly modulated laser transmitter and a 10 Gbps positive intrinsic negative photodiode receiver was developed for an optical network unit of a 10 Gbps passive optical network. Here, a low-cost mini-dual-in-line package was modified to contain whole components of a transmitter and receiver in a single space while satisfying the requirements of 10 Gbps micro-device package standards. The transmitter was fabricated to achieve high optical output power by placing a micro aspheric lens very close to the DFB LD and reducing the thermal resistance between an LD chip and heat sink to bring down the DFB LD chip temperature. As a result, the transmitter output power was 3.5 dB higher than a conventional transistor outline can BOSA due to a high optical coupling efficiency of more than 70% and a low thermal resistance for heat dissipation. The receiver sensitivity was −21  dBm at a bit error rate of 10−3 and the sensitivity penalty of the receiver due to signal crosstalk was less than 0.3 dB.

GPON upstream link utilization analysis with integrated network surveillance

We integrate physical layer surveillance concept into management system of GPON by allocating an unused time slot for network surveillance depending upon its availability in upstream GTC frame and analyze the link bandwidth utilization.