The Pattern Generator slot module of FOTS system is an efficient module for the characterization and test of external optical components and systems to be performed in high bit rate. This module is a kind of pattern generator and bit error rate tester that can be used to modulate optical components or systems and to test the bit error rate characteristics of optical systems or optical lines. This pattern generator slot includes two differential Tx/Rx channels, which can be operated simultaneously.

Using the built-in high-speed FPGA processor and its programmed internal PRBS pattern generation circuit, the Tx signal can be modulated up to the rate of 1.25Gbps in various pseudo random patterns. The PRBS pattern generation and BERT function of this module can be used to perform FTTx-PON test and optical line or system test. This instrument provides a wide application and attractive solution of performance and cost in pattern generation and bit error rate test.