HFCT-5964ATG NEL [Nel Frequency Controls,inc], HFCT-5964ATG Datasheet - Page 7

• Manufacturer Part Number: HFCT-5964ATG
• Description: ATG Single Mode Laser Small Form Factor Transceivers for ATM, SONET OC-3 /SDH STM-1 Part of the Agilent METRAK family
• Manufacturer: NEL [Nel Frequency Controls,inc]

Application Information
The Applications Engineering
Group at Agilent is available to
assist you with technical
understanding and design trade-
offs associated with these
transceivers. You can contact
them through your Agilent sales
representative.
The following information is
provided to answer some of the
most common questions about
the use of the parts.
Optical Power Budget and
Link Penalties
The worst-case Optical Power
Budget (OPB) in dB for a fiber-
optic link is determined by the
difference between the
Figure 6a. Recommended dc coupled interface circuit
7
T
B
P
P
V
B
Note: C1 = C2 = C3 = 10 nF or 100 nF
Note A: THE BIAS RESISTOR FOR VpdR SHOULD NOT EXCEED 200
* C4 AND C5 ARE OPTIONAL BYPASS CAPACITORS FOR ADDITIONAL
LOW FREQUENCY NOISE FILTERING.
T
R
DIS
MON
MON
MON
CC
MON
X
X
RX (+3.3 V)
(LVTTL)
NOTE A
-
+
-
+
200 W
20 19 18 17 16 15 14 13 12 11
1
2
3
10 nF
4
5
6
7
8
TRANSCEIVER INPUTS
minimum transmitter output
optical power (dBm avg) and the
lowest receiver sensitivity (dBm
avg). This OPB provides the
necessary optical signal range to
establish a working fiber-optic
link. The OPB is allocated for the
fiber-optic cable length and the
corresponding link penalties.
For proper link performance, all
penalties that affect the link
performance must be accounted
for within the link optical power
budget.
Electrical and Mechanical Interface
Recommended Circuit
Figures 6a and 6b show
recommended dc and ac coupled
circuits for deploying the Agilent
transceivers in +3.3 V systems.
9 10
TERMINATE AT
130 W
100 W
W
130 W
C2
C1
1 µH
1 µH
C5 *
10 µF
C4 *
10 µF
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
V
CC
C3
(+3.3 V)
10 µF
Data Line Interconnections
Agilent’s HFCT-5964TL/TG/NL/
NG/ATL/ATG fiber-optic
transceivers are designed to
couple to +3.3 V PECL signals.
The transmitter driver circuit
regulates the output optical
power. The regulated light
output will maintain a constant
output optical power provided
the data pattern is reasonably
balanced in duty cycle. If the
data duty cycle has long,
continuous state times (low or
high data duty cycle), then the
output optical power will
gradually change its average
output optical power level to its
preset value.
130 W
100 W
DEVICE INPUTS
TERMINATE AT
130 W
TD-
TD+
RD+
RD-
SD
PHY DEVICE
V
LVTTL
CC
LVPECL
LVPECL
V
CC
(+3.3 V)
(+3.3 V)