V23832-T2131-M101 Datasheet, PDF (12/30 Pages) Infineon Technologies AG – PAROLI 2 Tx AC, 1.6 Gbit/s

V23832-T2131-M101
V23832-R121-M101
Laser Eye Safety
Laser Eye Safety
The transmitter of the AC coupled Parallel Optical Link (PAROLI) is an IEC 60825-1
Amend. 2 Class 1M laser product. It complies with FDA performance standards (21 CFR
1040.10 and 1040.11) for laser products except for deviations pursuant to Laser Notice
No. 50, dated July 26, 2001. To avoid possible exposure to hazardous levels of invisible
laser radiation, do not exceed maximum ratings.
The PAROLI module must be operated under the specified operating conditions (supply
voltage can be adjusted between 3.0 V and 3.6 V) under any circumstances to ensure
laser eye safety.
Class 1M Laser Product
Attention: Invisible laser radiation. Do not view directly with optical instruments.
Note: Any modification of the module will be considered an act of “manufacturing”, and will
require, under law, recertification of the product under FDA (21 CFR 1040.10 (i)).
Laser aperture
and beam
File: 3506
Figure 6 Laser Emission
Laser Eye Safety Design Considerations
To ensure laser eye safety for all input data patterns each channel is controlled internally
and will be switched off if the laser eye safety limits are exceeded. A channel alerter
switches the respective data channel output off if the input duty cycle permanently
exceeds 57% (switching range 57 % min. - 65 % max.). The alerter will not disable the
channel below an input duty cycle of 57% under all circumstances.
The minimum alerter response time is 1 µs with a constant high input, i.e. in the input
pattern the time interval of excessive high input (e.g. ’1’s in excess of a 57% duty cycle,
consecutive or non-consecutive) must not exceed 1 µs, otherwise the respective channel
will be switched off. The alerter switches the respective channel from off to on without
the need of resetting the module if the input duty cycle is no longer violated.
All of the channel alerters operate independently, i.e. an alert within a channel does not
affect the other channels. To decrease the power consumption of the module unused
channel inputs can be tied to high input level. In this way a portion of the supply current
in this channel is triggered to shut down by the corresponding alerter.
Data Sheet
12
2003-11-19