Fiber Optics
SEPTEMBER 1999-1
V23816-N1018-C43
Single Mode 1550 nm 16-Line Parallel 2.5 GBd Transceiver
OC-48 SONET / SDH Telecom Links up to 80 km
Preliminary
FEATURES
Compliant with existing standards
Compact integrated transceiver unit with
Uncooled DFB 1550 nm laser diode transmitter with
optoisolator
InGaAs Avalanche Photodiode (APD) receiver
Internal high voltage power supply for APD
Pigtailed optical connections
Integrated Mux, Demux and Clock Recovery
Class 1 FDA and IEC laser safety compliant
Dual power supply (+3.3 V, +5 V)
OC-48 optical transmit and receive at 2488.32 Mbit/s
LVPECL (+3.3 V) Single Ended 16-line parallel interface at
155.52 Mbit/s
External control for laser shutoff
Loss of optical signal and Loss of synch indicators (Rx)
Loss of lock indicator for Tx high speed clock
Laser bias monitor
Absolute Maximum Ratings
Exceeding any one of these values may destroy the device
immediately.
PECL Supply Voltage (V
CC
PECL
)................................... 0 to 5.5 V
LVPECL Supply Voltage (V
CC
LVPECL
) ............................... 0 to 5 V
LVPECL Data and Clock Input Levels................... 0 to V
CC
LVPECL
LVPECL Data and Clock Output Source Current............... 50 mA
Operating Ambient Temperature
(1)
.............................. 0 to 70C
Storage Ambient Temperature
................................
40 to +85C
Static Discharge Voltage, All Pins .................................... 1000 V
Input Common Mode Noise on Supply Lines
(2)
......... 50 mV p-p
Notes
1. Operating ambient temperature with 200 lfm airflow across the
transceiver. In the case of convection cooling, the operating ambient
temperature is specified to be 0 to +50 degrees C.
2. 6 KHz to 2 MHz
Dimensions in (mm) inches
(0.435)
.013
(22.86)
.9
(88.9
0.5
)
3.5
.02
Bottom view
Rx
Tx
35.56
1.4
57.15
2.25
(63.5
0.5
)
2.5
0.02
(570
25)
22.44
1
(4.64)
.183
69.85
2.75
(57.15)
2.25
Top side
a
(
3.2
0.12)
.126
.005
(53.48
0.03)
2.106
.001
dia.078+.003)
1.98+0.08
(15.88
0.5)
.625
.02
(1)
.04
(10.16
0.25)
.4
.01
(13.72
0.5)
.54
.02
4x
b
c
c
Pin 99
Pin 100
Pin 1
Pin 2
4
c
c
Top side
Fiber Optics
V23816-N1018-C43 SM 1550nm 2.5 GBd Trx OC-48 SONET/SDH Telecom Links,80km
2
DESCRIPTION
The Infineon single mode SONET/SDH transceiver is compliant
with the Bellcore GR-253, ITU-T G.957 and ITU-T G.958 specifi-
cations. The transmitter section consists of a multiplexer, laser
driver, DFB laser diode with optoisolator and pigtail single mode
fiber. The receiver section consists of a single mode fiber pig-
tail, APD photodiode / preamplifier, postamplifier, clock and
data recovery unit and a demultiplexer. The 155 Mbit/s parallel
data interface frees the customer from the concerns of pcb
layout at 2.5 Gbit/s.
The pluggable connector mates easily to the customer pcb, and
allows the transceiver to be removed prior to any solder reflow
or washing of the customer pcb.
The transceiver operates from a dual power supply (+3.3 V and
+5 V). The transceiver electrical interface is via a 100 pin plugga-
ble connector pair. The transmit and receive electrical signals
each consist of 16 parallel single-ended data lines which are
LVPECL (+3.3 V) compatible, and a differential LVPECL clock.
Both the transmit input data and clock lines, and the receive
outputs data and clock lines, are internally biased and termi-
nated. All lines are DC coupled to the interface connector.
Functional Description
This transceiver is designed to transmit and receive serial
2.5 Gbit/s data via single mode fiber at 1550 nm wavelength.
The transmitter accepts 16 lines of parallel electrical data at
155.52 Mbit/s and a synchronous transmit clock at 155.52 MHz.
The data should be updated on the rising edge of the positive
transmit clock (TxDI55P). The data is multiplexed into a serial
data stream at 2488.32 Mbit/s. The data follows the SONET bit
ordering, where the MSB (Bit 0) is transmitted first, and the
LSB (Bit 15) is transmitted last. The laser driver circuit drives the
modulation and bias currents of the laser diode. The
2488.32 Mbit/s optical data stream is transmitted at 1550 nm
wavelength. The laser bias current is controlled by a power
control circuit, which regulates the output power over tempera-
ture and aging. This is accomplished by using the output of a
monitor PIN diode (mechanically built into the laser unit) as a
feedback signal to prevent the laser power from exceeding the
operating limits. The laser driver modulation current is tempera-
ture compensated to ensure a constant extinction ratio over
temperature variations.
The laser can be switched off with a logical low signal on the
Laser Shutoff input. The input is internally pulled high, so it can
be driven with an open collector TTL interface. The laser bias
current is monitored as an analog output voltage at the Bias
Monitor output (IB) pin. The bias monitor can be used to
monitor the aging of the laser.
The receiver accepts an input serial optical data stream at
2488.32 Mbit/s. The APD/Preamp detects the incoming light
and converts it to an electrical current, which is then amplified.
An internal high voltage DC-DC converter uses the +5 V input
to generate a +90 V level which is applied to the APD in reverse
bias. This voltage sets the multiplication factor of the APD,
which has superior input sensitivity compared to a PIN photo-
diode. The Clock and Data Recovery unit recovers the clock
from the input data stream, and aligns the data so it is synchro-
nous with the clock. The data is then demultiplexed directly to
16 lines of parallel data at 155.52 Mbit/s, with the MSB being
Bit 0 and the LSB being Bit 15. The receiver also outputs a
155.52 MHz synchronous clock. The received data is updated
on the falling edge of the positive receive clock (RxQ155P).
The Rx Alarm (FLAG) indicator will switch active low if there is a
loss of optical input signal (LOS) or if the PLL in the clock recov-
ery unit is unlocked (Lock). The FLAG output is an open collec-
tor TTL, and can be used to monitor the function of the receiver.
TECHNICAL DATA
The electro-optical characteristics described in the following
tables are only valid for use under the recommended operating
conditions.
Recommended Operating Conditions
Parameter
Symbol
Min.
Typ.
Max.
Units
Operating Ambi-
ent Tempera-
ture
(1)
T
AMB
0
70
C
Supply Voltage
5 V PECL
V
CCPECL
4.75
5.0
5.25
V
Supply Voltage
3.3 V LVPECL
V
CCLVPECL
3.04
3.3
3.46
Supply Current
5 V PECL
I
CCPECL
380
Tbd
mA
Supply Current
3.3 V LVPECL
I
CCLVPECL
1270
Tbd
Total Power
Consumption
P
TOT
5.0
Tbd
W
Transmitter
Data Input Bit
Rate
155.52
Mbit/
s
Clock Input Fre-
quency
155.52
MHz
Clock Input Fre-
quency Toler-
ance
100
100
ppm
Clock Input Duty
Cycle
40
50
60
%
Clock Input Jitter
Tolerance,
10 Hz to 20 MHz
UI, rms
0.1
rms
UI, p-p
1
p-p
Clock Input Re-
turn Loss,
10 MHz to 700
MHz
20
dB
Data Input Re-
turn Loss,
10
MHz to 700
MHz
15
dB
Fiber Optics
V23816-N1018-C43 SM 1550nm 2.5 GBd Trx OC-48 SONET/SDH Telecom Links,80km
3
Recommended Operating Conditions - continued
Note
1. Operating ambient temperature with 200 lfm airflow across the
transceiver. In the case of convection cooling, the operating ambient
temperature is specified to be 0 to +50 degrees C.
2. Tx Clock and Tx Data inputs are DC coupled and internally biased
and terminated.
3. Tx Clock input is differential LVPECL. Tx Data inputs are single ended
LVPECL.
4. The Laser Shutoff input is pulled high internally to VCC
LVPECL
(+3.3 V) through a 1K resistor.
5. The Tx Lock Detect output is open collector TTL.
6. Measured with 50
to VCC
LVPECL
-2 V. The Rx Clock and Data out-
puts are DC coupled.
7. Rx Clock output is differential LVPECL. Rx Data outputs are single
ended LVPECL.
8. The Rx FLAG output is open collector TTL.
AC Electrical Characteristics
Note
1. Transmitter input data leading the rising edge of transmit clock
positive (TxD155P).
2. Transmitter input data lagging the rising edge of transmit clock
positive (TxD155P).
3. Receiver output data propogation delay with respect to the falling
edge of the positive receive output clock (RxQ155P).
Transmitter Input Timing Diagram
Receiver Output Timing Diagram
Transmitter
Min.
Typ.
Max.
Units
Clock and Data Input High
Voltage
(2)
V
CC
LVPECL
1.165
V
CC
LVPECL
0.88
V
Clock and Data
Input Low Voltage
(2)
V
CC
LVPECL
2
V
CC
LVPECL
1.475
Clock Input Diffential Swing
0.3
1.3
V p-p
Data Input Single Ended
Swing
(3)
0.15
0.6
Input Clock and Data Rise/
Fall Time 10%90%
0
1.5
ns
Laser Shutoff Input High
Voltage
(4)
V
Laser Shutoff Input Low
Voltage
(4)
0.8
Laser Shutoff Input Cur-
rent High
(4)
5
A
Laser Shutoff
Input Current Low
(4)
(Sink)
330
mA
Laser Shutoff
Delay Time
3
s
Laser Bias Monitor Transfer
Constant
19
20
21
mV/
mA
Laser Bias Monitor Output
Current
10
mA
Lock Detect Output High
Voltage
(5)
TTL Open Collector
V
Lock Detect Output Low
Voltage
0.3
Lock Detect Output Current
(Sink)
(5)
200
mA
Receiver
Data Output Bit Rate
155.52
Mbit/s
Clock Output Frequency
155.52
MHz
Clock Output Duty Cycle
45
50
55
%
Clock and Data Output High
Voltage
(6)
V
CC
LVPECL
1.15
V
CC
LVPECL
0.65
V
Clock and Data Output Low
Voltage
(6)
V
CC
LVPECL
2.2
V
CC
LVPECL
1.75
Clock Output Diffential
Swing
(7)
0.6
1.3
V p-p
Data Output Single Ended
Swing
(7)
0.3
0.8
Output Clock & Data Rise/
Fall Time 10%90%
0.5
1.5
ns
FLAG Output High Voltage
(8)
V
FLAG Output Low Voltage
0.3
Transmitter
Symbol
Min.
Typ.
Max. Units
Data Input Lead Time
(1)
Tlead
1.0
ns
Data Input Lag Time
(2)
Tlag
Receiver
Data Output Propogation
Delay
(3)
Tpd
1
1
ns
Tlead
Tlag
TXD(0..15)
TXD155P
Tpd
RXQ155P
RXQ(0..15)
Fiber Optics
V23816-N1018-C43 SM 1550nm 2.5 GBd Trx OC-48 SONET/SDH Telecom Links,80km
4
Transmitter Electro-Optical Characteristics
Transmitter Electro-Optical Characteristics (continued)
Notes
1. The transmitter contains a control circuit which regulates the aver-
age optical output power.
2. The Eye Diagram is compliant with Bellcore GR-253 and ITU-T G.957
specifications.
3. Jitter Generation is compliant with GR-253 and ITU-T G.958 specifi-
cations, when measured using a high pass filter with 12 KHz cutoff
frequency, and with a jitter level on the Tx Clock input which is less
than the Jitter Tolerance levels specified in "Transmitter - Recom-
mended Operating Conditions".
4. If the +3.3 V LVPECL Tx power supply drops below the specified
level, the laser bias and modulation currents will be held disabled
until the supply voltage rises above threshold, and after the Power
On Delay Time period.
5. A fault, such as high laser bias current or high average power, which
lasts longer than the specified Fault Delay time, will cause the trans-
mitter to be disabled. Cycling of DC power is then required to reset
the transceiver.
Receiver Electro-Optical Characteristics
Notes
1. Average Rx power for a 1x10
-10
BER, and using a PRBS pattern of
2
23
-1 length with 72 zeros and 72 ones inserted as per ITU-T G.958.
2. Jitter Tolerance for a 1 dB power penalty is defined to be 15 UI fro 10
Hz to 600 Hz, 1.5 UI from 6 KHz to 100 KHz, and 0.15 UI from 1 MHz
onwards, per ITU-T G.958.
3. Jitter Transfer is defined to be less than 0.1 dB up to 2 MHz, and
dropping at -20 dB/Decade after that point, per ITU-T G.958.
4. The Rx FLAG output is an active low, open collector TTL output,
which is set low if there is a loss of Rx optical signal input (LOS), or if
the clock recovery unit is unable to lock onto the Rx data input. A
decrease in optical input power below the Assert Level will cause
the FLAG output to switch Low (On).
Regulatory Compliance
Transmitter
Symbol Min.
Typ.
Max. Units
Nominal Peak Wavelength
NOM
1550
nm
Range of Peak
Wavelength
MIN-
MAX
1500
1580
Spectral Bandwidth
(20 dB)
20
1
Side Mode Suppression
Ratio
SSR
30
dB
Average Output Power
(1)
P
AVG
3
0
2
dBm
Extinction Ratio
ER
8.2
dB
Optical Isolation
I
S
25
Output Rise Time,
20%-80%
T
R
200
ps
Output Fall Time,
80%-20%
T
F
200
Eye Diagram
(2)
ED
Jitter Generation
(3)
J
GEN
0.01
UI rms
Reset Threshold for
V
CC
LVPECL
(4)
V
TH
2.2
2.95
V
Transmitter
Symbol Min.
Typ.
Max. Units
Power on delay for
V
CC
LVPECL
(4)
T
POD
20
ms
Fault Delay
(5)
T
FAULT
20
Receiver
Symbol
Min.
Typ.
Max.
Units
Nominal Center Wave-
length
NOM
1550
nm
Sensitivity (Average
Power)
(1)
P
IN
32
28
dBm
Overload (Average
Power)
P
OL
9
Optical Return Loss
RL
RX
27
dB
Jitter Tolerance
(2)
J
TOL
Jitter Transfer
(3)
J
XFR
Optical Path Penalty
P
PEN
2
d
Clock Recovery
Acquisition Lock Time
T
LOCK
16
s
FLAG Output LOS
Assert Level
(4)
P
ASSERT
45
35
dBm
FLAG Output LOS
Hysteresis
P
HYST
1
dB
FLAG Output LOS
Assert Time
T
ASSERT
100
s
Feature
Standard
Comments
Electrostatic
Discharge (ESD)
to the Electrical
Pins
MIL-STD 883C
Method 3015.4
Class 1 (>1000 V)
Immunity:
Electrostatic
Discharge (ESD)
to the
SC Connector
EN 61000-4-2
IEC 1000-4-2
Discharges of
15kV
with an air discharge
probe on the receptacle
cause no damage.
Immunity:
Radio Frequency
Electromagnetic
Field
EN 61000-4-3
IEC 1000-4-3
With a field strength of
10 V/m rms, noise
frequency ranges from
10 MHz to 1 GHz. No
effect on transceiver
performance between
the specification limits.
Emission:
Electromagnetic
Interference (EMI)
FCC Class B
EN 55022 Class B
CISPR 22
Noise frequency range:
30 MHz to 1 GHz
Fiber Optics
V23816-N1018-C43 SM 1550nm 2.5 GBd Trx OC-48 SONET/SDH Telecom Links,80km
5
Pin Description of Interface Connector
Pin# Pin Name
I/O Level /
Logic
Description
1
Tx GND
I
Supply
2
Tx GND
I
Supply
3
TxD0
I
LVPECL
155 Mb/s Data Input, MSB
4
Tx GND
I
Supply
5
Tx GND
I
Supply
6
TxD1
I
LVPECL
155 Mb/s Data Input
7
TxD2
I
LVPECL
155 Mb/s Data Input
8
Tx GND
I
Supply
9
Tx GND
I
Supply
10
TxD3
I
LVPECL
155 Mb/s Data Input
11
TxD4
I
LVPECL
155 Mb/s Data Input
12
Tx GND
I
Supply
13
Tx GND
I
Supply
14
TxD5
I
LVPECL
155 Mb/s Data Input
15
TxD6
I
LVPECL
155 Mb/s Data Input
16
Tx GND
I
Supply
17
Tx GND
I
Supply
18
TxD7
I
LVPECL
155 Mb/s Data Input
19
TxD8
I
LVPECL
155 Mb/s Data Input
20
Tx GND
I
Supply
21
Tx GND
I
Supply
22
TxD9
I
LVPECL
155 Mb/s Data Input
23
TxD10
I
LVPECL
155 Mb/s Data Input
24
Tx GND
I
Supply
25
Tx GND
I
Supply
26
TxD11
I
LVPECL
155 Mb/s Data Input
27
TxD12
I
LVPECL
155 Mb/s Data Input
28
Tx GND
I
Supply
29
Tx GND
I
Supply
30
TxD13
I
LVPECL
155 Mb/s Data Input
31
TxD14
I
LVPECL
155 Mb/s Data Input
32
Tx GND
I
Supply
33
Tx GND
I
Supply
34
TxD15
I
LVPECL
155 Mb/s Data Input
35
TxD155P
I
LVPECL
155 MHz Clock Input Positive
36
Tx GND
I
Supply
37
TxD155N
I
LVPECL
155 MHz Clock Input Nega-
tive
38
Tx GND
I
Supply
39
Tx GND
I
Supply
40
155M_OOL O
TTL
Open
Collector
Active Low status signal to in-
dicate lock condition of 155
MHz Clock Regenerator PLL.
Low=Unlocked
41
MUX +3.3
I
Supply
Supply for Tx MUX
42
Tx +3.3
I
Supply
Supply for Tx LVPECL
43
MUX +3.3
I
Supply
Supply for Tx MUX
44
Tx +3.3
I
Supply
Supply for Tx LVPECL
45
VO
ref
O
Refer-
ence
V
OH
V
OL
+
2
------------------------------------
0 12 V
,
Pin# Pin Name
I/O Level /
Logic
Description
46
Laser
shutoff
I
TTL (w/
Pullup)
Active Low control signal to
turn off laser. Low = Laser
Disable
47
IB
O
Analog
Analog voltage proportional to
laser bias current. 20 mV / mA
48
Tx GND
I
Supply
49
Tx GND
I
Supply
50
Tx +5
I
Supply
Supply for Tx PECL
51
Rx GND
I
Supply
Supply for Rx
52
Tx GND
I
Supply
Supply for Tx
53
Rx GND
I
Supply
Supply for Rx
54
Rx GND
I
Supply
Supply for Rx
55
DEMUX
+3.3
I
Supply
Supply for Rx DEMUX
56
Rx +5
I
Supply
Supply for Rx LVPECL
57
DEMUX
+3.3
I
Supply
Supply for Rx DEMUX
58
Rx +5
I
Supply
Supply for Rx PECL
59
Rx +3.3
I
Supply
Supply for Rx LVPECL
60
Rx GND
I
Supply
Supply for Rx
61
Rx +3.3
I
Supply
Supply for Rx LVPECL
62
Rx GND
I
Supply
63
Rx GND
I
Supply
64
FLAG
O
TTL
Open
Collector
Active low status signal to in-
dicate Rx loss of signal or loss
of synchronization.
Low = Rx Fault
65
Rx Q15
O
LVPECL
155 Mb/s Data Output, LSB
66
Rx GND
I
Supply
67
Rx GND
I
Supply
68
Rx Q14
O
LVPECL
155 Mb/s Data Output
69
Rx Q13
O
LVPECL
155 Mb/s Data Output
70
Rx GND
I
Supply
71
Rx GND
I
Supply
72
Rx Q12
O
LVPECL
155 Mb/s Data Output
73
Rx Q11
O
LVPECL
155 Mb/s Data Output
74
Rx GND
I
Supply
75
Rx GND
I
Supply
76
Rx Q10
O
LVPECL
155 Mb/s Data Output
77
Rx Q9
O
LVPECL
155 Mb/s Data Output
78
Rx GND
I
Supply
79
Rx GND
I
Supply
80
Rx Q8
O
LVPECL
155 Mb/s Data Output
81
Rx Q7
O
LVPECL
155 Mb/s Data Output
82
Rx GND
I
Supply
83
Rx GND
I
Supply
84
Rx Q6
O
LVPECL
155 Mb/s Data Output
85
Rx Q5
O
LVPECL
155 Mb/s Data Output
86
Rx GND
I
Supply
87
Rx GND
I
Supply
88
Rx Q4
O
LVPECL
155 Mb/s Data Output
89
Rx Q3
O
LVPECL
155 Mb/s Data Output
90
Rx GND
I
Supply
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