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AFSI-SD4Q4L: DC Bias Controller for Quad Electro-Absorption Modulator (EAM)

Overviews:

The AFSI-SD4Q4L 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. A sensor block is provided to monitor the temperature and various voltage supplies.

AFSI-SD4Q4L Features:

Four independent current sources for DFB bias (0 to 140mA) with DAC control (10 bits) 

Four independent voltage sources for EAM (0 to -3V) with DAC control (10 bits) 

Four independent channels for EAM current monitoring (0 to 40 mA, 10 bit ADC) 

Four independent channels of RSSI input monitoring (0 to 2.3 mA, 10 bit ADC) 

Laser Junction Voltage monitoring (Vf) 

Chip hardware reset

Global BIAS_disable control functions to disable all channel of DFB bias outputs

Global RX_LOS output generated from RSSI inputs, with programmable LOS level

Supports microcontroller and host TWS interfaces

−40°C to 125°C  junction operating temperature

Applications:

EML-based optical transceivers

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