An ultracompact, 2-cc-size, low-power 2.5-Gb/s optical receiver module incorporating an MU receptacle

This paper describes an ultracompact, -3-V-supply, 2.5-Gb/s optical receiver module. For miniaturization of a gigabit-class receiver module, we used multichip configuration and bump technology, and we incorporated a miniature unit-coupling (MU) receptacle for small-size optical interface. To eliminate required external adjustment devices in the module for reduction of module size and assembling cost, we introduced new circuit techniques; the multistage automatic offset canceling technique is used for the postamplifier, and the sample-and-hold phase-locked loop (PLL) technique is employed for the clock and data recovery circuits. All the ICs were designed to operate at a low DC power supply of -3 V. The IC current was reduced by using 0.5-μm Si bipolar process technology. The volume is only 2 cc (9×30.3× 7.7 mm³), including the MU receptacle. The experimental results show that the receiver has a wide dynamic range, from more than -2 to -19.4 dBm in optical input. These results were obtained without making any external adjustments. The module consumes a total power of 0.64 W