HFCT-5215B Agilent Technologies, Inc., HFCT-5215B Datasheet - Page 4

• Manufacturer Part Number: HFCT-5215B
• Description: 155 Mb/s Single Mode Laser Transceiver For Atm, Sonet OC-3/SDH STM-1 (L1.1)
• Manufacturer: Agilent Technologies, Inc.

Functional Description
Transmitter Section
Design
The transmitter section, Figure 3,
uses a Multiple Quantum Well
laser as its optical source. The
packaging of this laser is designed
for repeatable coupling into single
mode fiber while maintaining
compliancy with IEC 825 Class 1
and CDRH Class I eye safety
requirements. The optical output
is controlled by a custom IC
which detects the laser output via
the monitor photodiode. This IC
provides both dc and ac current
drive to the laser to ensure correct
modulation, eye diagram and
extinction ratio over temperature,
supply voltage and life.
4
Figure 3 - Simplified Transmitter Schematic
DATA
DATA
INPUT
PECL
PCB mounting
The HFCT-5215 has two
solderable mounting studs. These
studs are not electrically
connected. The transceiver is
designed for common production
processes. It may be wave
soldered and aqueous washed
providing the process plug is in
place.
Each process plug can only be
used once during processing,
although with subsequent use, it
can be used as a dust cover.
MODULATOR
LASER
LASER BIAS
LASER BIAS
CONTROL
DRIVER
LASER
(rear facet monitor)
PHOTODIODE