InP-HBT optoelectronic integrated circuits for photonicanalog-to-digital conversion

摘要

A monolithically integrated optical receiver and a 4-bit flashnanalog-to-digital converter, all in InP HBT technology, have beennimplemented. The optical receiver converts an incoming optical pulsentrain into an electronic signal and is functional up to 10 Gsps. Thenelectronic input 4-bit flash ADC achieves 3.8 effective bits at lowninput frequency and 2.1 effective bits at Nyquist input frequency whennsampled at 10 Gsps. A 4-bit version has 2.8 effective bits at low-inputnfrequency and 2.4 effective bits at Nyquist-input frequency when samplednat 10 Gsps. The 4-bit ADC operates up to 18 Gsps where it has 1.7neffective bits at Nyquist-input frequency