1
Zarlink Semiconductor Inc.
PX6410
Multi-Rate VCSEL Driver
Product Brief
September 2004
Features
Up to 10.7 Gb/s serial VCSEL driver
Single +3.3 V supply
Average power control (APC) provides
constant output optical power
Digital diagnostics provided with bias,
photodiode, and temperature monitors
Independent temperature compensation
for VCSEL bias and modulation current
VCSEL fault protection limits output
optical power for laser safety
Differential CML compatible inputs with
on-chip termination
4 mm x 4 mm QFN package
Applications
XFP, XENPAK, X2, XPAC form factors
10GbE, 10GFC, 8GFC, 4GFC, OC-192
Proprietary intra-system optics
Description
The growing use of the Internet has created
increasingly higher demand for multi-Gb/s I/O
performance. The demand for 10+ Gb/s WAN
bandwidth fuels the growth of short-reach 10
Gb/s infrastructures within high-end telco and
datacom routers, switches, servers and other
proprietary chassis-to-chassis links.
The Zarlink PX6410 10 Gb/s serial VCSEL driver
is designed for various 10 Gb/s PMD
applications. It consists of a DC-coupled
amplifier with adjustable modulation and bias
currents optimized for driving commercially
available VCSEL-based transmit optical sub
assemblies (TOSAs) from a single +3.3 V supply.
VCSEL modulation and bias currents can be
programmed by a variety of means including
external resistors, programmable potentiometers
or microcontroller DAC outputs. Selectable
current temperature coefficients and APC
feedback control allow optical output power and
extinction ratio to be maintained over
temperature.
PX6
410
2
Zarlink Semiconductor Inc.
PX6410
Product Brief
Figure 1: Filtered 10.3125 Gb/s PRBS23 optical data pattern
Temp Sensor
Transmission Line
VCSEL Anode
PD Cathode
TOSA
VCSEL Cathode
Data_P
Data_N
Disable
Tx_In_N
Tx_In_P
Tx_Out
Tx_Bias
Tx_Bias
VCC
TC_Bias
GND
GND
Comp
Tx_Dis
Tx_Flt
RMod
Pwr_Mon
RPower
Bias_Mon
Monitor
GND
VTherm
RSafe
VCC
VCC TC_Mod
RBias
+3.3V
Interrupt
TOSA
PD monitor
*
Figure 2: Typical APC closed-loop
configuration using TOSA monitor
photo diode to provide constant
VCSEL output power. Modulation
current temperature compensation
also enabled to improve extinction
ratio across operating temperatures.
Temp Sensor
VCSEL Anode
PD Cathode
TOSA
VCSEL Cathode
Interrupt
+3.3V
Data_P
Data_N
Disable
Tx_In_N
Tx_In_P
Tx_Out
Tx_Bias
Tx_Bias
VCC
TC_Bias
GND
GND
Comp
Tx_Dis
Tx_Flt
RMod
Pwr_Mon
RPower
Bias_Mon
Monitor
GND
VTherm
RSafe
VCC
VCC TC_Mod
RBias
VCSEL bias
monitor
*
See Table 2 for temperature
compensation configurations
*
Figure 3: Typical open-loop configuration with
internal temperature compensation
enabled for bias and modulation
currents.
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