A compact 3R-receiver module for short-haul SDH STM-16 systems

Abstract

This paper describes a complete 3R optical receiver module for synchronous digital hierarchy (SDH) STM-16 short-haul systems, housed in a 20-pin dual-in-line (DIL) ceramic package. The module includes an InGaAs p-i-n photodiode, a commercial GaAs transimpedance amplifier, and a custom-made silicon bipolar frequency- and phase-locked loop (FPLL)-based clock and data recovery (CDR) circuit. The fiber pigtail is actively aligned to the photodiode by using a proprietary technology that uses a silicon-based optical submount assembly (OSA). The use of a clock recovery circuit based on an FPLL allows avoiding an external low-frequency reference clock and achieving a root-mean square (rms) jitter of 0.075 UI. The module requires two supply voltages of 5 V and 4.5 V, for a total power dissipation of 930 mW, and has a total volume below 0.75 cm3 (24.7x9.9x3 mm3). Measurements have shown full compatibility with SDH standards

Input-Matching and Offset-Cancelling Networks for Limiting Amplifiers in Optical Communication Systems

“…The dc gain of the feedback network results β o ≈ 0.7 in case of decoupled inputs, therefore yielding a dc loop gain of 37 dB and a lower cut-off frequency of 128 kHz for the amplifier. The chip was designed to be mounted bare die in a receiver module [14] or to be used with high frequency packages. To study the compatibility with the use of low cost plastic packages, we mounted it in a TQFP 48-pin package, whose die cavity measures 7 × 7 mm 2 .…”