2Avago Technologies Condential
Receiver
The optical receiver incorporates a 12-channel PIN photo-
diode array, a 12-channel pre-amplier and output buer,
diagnostic monitors, and control and bias blocks. The Rx
Output Buer provides dierential outputs for the high
speed electrical interface presenting nominal single-end-
ed output impedances of 50 W to AC ground and 100 W
dierentially that should be dierentially terminated with
100 W. AC coupling capacitors are located inside the CXP
module and are not required on the host board.
Modules have a monitor for optical input power; results
are available through the TWS interface. Alarm thresholds
are established for the monitored attributes. Flags are set
and interrupts generated when the attributes are outside
the thresholds.
Over the TWS interface, the user can, for individual
channels, control (ip) polarity of the dierential outputs,
de-activate channels, disable the squelch function,
program output signal amplitude and deemphasis.
Flags are also set and interrupts generated for loss of
optical input signal (LOS). All ags are latched and will
remain set even if the condition initiating the latch clears
and operation resumes. All interrupts can be masked and
ags are reset upon reading the appropriate ag register.
The electrical output will squelch for loss of input signal
(unless squelch is disabled) and channel de-activation
through TWS interface. Status and alarm information are
available via the TWS interface. To reduce the need for
polling, the hardware interrupt signal is provided to inform
hosts of an assertion of an alarm and/or LOS.
Transmitter
The optical transmitter incorporates a 12-channel VCSEL
(Vertical Cavity Surface Emitting Laser) array, a 12-channel
input buer and laser driver, diagnostic monitors, and
control and bias blocks. The transmitter is designed for
EN 60825 and CDRH eye safety compliance. The Tx Input
Buer provides dierential inputs presenting a nominal
dierential input impedance of 100 Ohms. AC coupling
capacitors are located inside the CXP module and are not
required on the host board. For module control and inter-
rogation, the control interface incorporates a Two Wire
Serial (TWS) interface of clock and data signals.
Modules have monitors for VCSEL bias, light output power
(LOP), temperature, and power supply voltage implement-
ed; real-time results are available through the TWS interface.
Alarm thresholds are established for the monitored
attributes. Flags are set and interrupts generated when the
attributes are outside the thresholds.
Over the TWS interface, the user can, for individual
channels, control (ip) polarity of the dierential inputs,
de-activate channels, disable the squelch function and
program input equalization levels to reduce the eect of
long PCB traces.
Flags are also set and interrupts generated for loss of input
signal (LOS) and transmitter fault conditions. All ags are
latched and will remain set even if the condition initiating
the latch clears and operation resumes. All interrupts can
be masked and ags are reset by reading the appropriate
ag register.
The optical output will AC squelch for loss of input signal
unless squelch is disabled. The input thresholds for the Tx
squelch are tied to Tx LOS thresholds which are informa-
tive only. See Tx LOS thresholds specication on page 6.
Fault detection or channel deactivation through the TWS
interface will disable the channel. Status, alarm and fault
information are available via the TWS interface. To reduce
the need for polling, the hardware interrupt signal is
provided to inform hosts of an assertion of an alarm, LOS
and/or Tx fault.
WARNING CAUTION! Safe to view laser output with the naked eye or with the aid of typical
magifying optics (e.g. telescope or microscope.)
CAUTION! Use of controls or adjustments or performance of procedures other
than those specied herein may result in hazardous radiation exposure
Note: Standard used for classication: EN 60825-1:2007
CLASS 1 LASER PRODUCT
CLASS 1 LASER PRODUCT: INVISIBLE LASER RADIATION, DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS