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AFSI-SD4B4L: Second-Generation DC Bias Controller for Quad-Channel EML

Overviews:

The AFSI-SD4B4L IC provides DC control for optical transceivers based on a Quad Electro-Absorption Modulator (EAM). Four current bias outputs and four negative voltage bias outputs are generated for both the DFB laser and the Electro-Absorption Modulator (EAM). Receiver photocurrent, generated by each EAM, can be monitored and the IC also interfaces with the ROSA to monitor the input optical signal (RSSI) and manage the LOS output signal. There are four EML Monitor Photodiode current monitors, four positive and four negative general purpose DACs. A sensor block is provided to monitor the IC temperature and the voltage supplies.

AFSI-SD4B4L Features:

Four independent current sources for DFB bias 

Four independent voltage sources for EAM

Four independent channels for EAM current monitoring

Four independent channels of MPD bias 

Four independent channels of RSSI input monitoring

Independent channels of General Purpose DACs 

Four Positive (0 to 3V/4V, 6 bit DAC; 0 to 5mA) 

Four Negative (0 to 3-V/-4V, 6 bit DAC; 0 to 5mA) 

Laser Junction Voltage monitoring (Vf) 

Temperature monitoring (-10 to 110 C, 10 bit ADC) 

Applications:

EML-based optical transceivers

400G DR4

400G FR4

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