Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 1
Preliminary Product Specification
Multi-rate CWDM Pluggable SFP Transceiver
FWLF1521P2Nxx
PRODUCT FEATURES
• Up to 2.67 Gb/s bi-directional
data links
• Hot-pluggable SFP footprint
• Built-in digital diagnostic
functions
• Uncooled DFB laser transmitter in
8 possible CWDM wavelengths
• Duplex LC connector
• Very low jitter
• Metal enclosure, for lower EMI
• Single 3.3V power supply
• Low power dissipation
• Operating temperature range:
-10°C to 85°C
APPLICATIONS
• Metro Access Rings and Point-to-
Point networking for SONET, Gigabit
Ethernet and Fibre Channel
• High temperature environments
Finisar’s FWLF1521P2Nxx CWDM Small Form Factor Pluggable (SFP) transceivers are
designed for operation in Metro Access Rings and Point-to-Point networks using
SONET
1
,Gigabit Ethernet
2
and Fibre Channel
3
networking equipment. They are available
in eight different CWDM wavelengths and comply with ITU CWDM standard
4
. Digital
diagnostics functions can be accessed via an I
2
C serial bus. In addition, the transceivers
comply with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA)
5
are
RoHS and lead free compliant per Directive 2002/95/EC
6
and Finisar Application Note
AN-2038
7
.
PRODUCT SELECTION
Wavelength
xx
Clasp Color
Code
Wavelength
xx
Clasp Color
Code
1471 nm 47 Gray 1551 nm 55 Yellow
1491 nm 49 Violet 1571 nm 57 Orange
1511 nm 51 Blue 1591 nm 59 Red
1531 nm 53 Green 1611 nm 61 Brown
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 2
I. Pin Descriptions
Pin Symbol Name/Description Ref.
1 V
EET
Transmitter Ground (Common with Receiver Ground) 1
2 T
FAULT
Transmitter Fault. Not supported.
3 T
DIS
Transmitter Disable. Laser output disabled on high or open. 2
4 MOD_DEF(2) Module Definition 2. Data line for Serial ID. 3
5 MOD_DEF(1) Module Definition 1. Clock line for Serial ID. 3
6 MOD_DEF(0) Module Definition 0. Grounded within the module. 3
7 Rate Select No connection required 4
8 LOS Loss of Signal indication. Logic 0 indicates normal operation. 5
9 V
EER
Receiver Ground (Common with Transmitter Ground) 1
10 V
EER
Receiver Ground (Common with Transmitter Ground) 1
11 V
EER
Receiver Ground (Common with Transmitter Ground) 1
12 RD-
Receiver Inverted DATA out. AC Coupled
13 RD+ Receiver Non-inverted DATA out. AC Coupled
14 V
EER
Receiver Ground (Common with Transmitter Ground) 1
15 V
CCR
Receiver Power Supply
16 V
CCT
Transmitter Power Supply
17 V
EET
Transmitter Ground (Common with Receiver Ground) 1
18 TD+ Transmitter Non-Inverted DATA in. 100 ohm termination between TD+
and TD-, AC Coupled thereafter.
19 TD-
Transmitter Inverted DATA in. See TD+
20 V
EET
Transmitter Ground (Common with Receiver Ground) 1
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. Laser output disabled on T
DIS
>2.0V or open, enabled on T
DIS
<0.8V.
3. Should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 5.5V.
MOD_DEF(0) pulls line low to indicate module is plugged in.
4. Finisar 2x receiver achieves simultaneous 1x and 2x operation without active control.
5. LOS is open collector output. Should be pulled up with 4.7k – 10kohms on host board to a voltage
between 2.0V and 5.5V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
VeeT
VeeT
VeeR
VeeR
TD-
TD+
RD+
RD-
VccT
VccR
VeeT
VeeR
TXFault
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
Rate Select
LOS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Towards
ASIC
Towards
Bezel
TX Disable
VeeR
Diagram of Host Board Connector Block Pin Numbers and Names
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 3
II. Absolute Maximum Ratings
Parameter Symbol Min Typ Max Unit Ref.
Maximum Supply Voltage Vcc -0.5 4.0 V
Storage Temperature T
S
-40 85 °C
Case Operating Temperature T
OP
-10 85 °C
III. Electrical Characteristics
(T
OP
= -10 to 85 °
°°
°C, V
CC
= 3.11 to 3.5 Volts)
Parameter Symbol Min Typ Max Unit Ref.
Supply Voltage Vcc 3.1 3.5 V
Supply Current Icc 200 350 mA
Transmitter
Input differential impedance R
in
100 Ω 1
Differential data input swing Vin,pp
500 1600 mV
Transmit Disable Voltage V
D
Vcc – 1.3 Vcc V
Transmit Enable Voltage V
EN
Vee Vee+ 0.8 V 2
Transmit Disable Assert Time
10 us
Receiver
Single ended data output swing Vout,pp
250 470 mV 3
Data output rise time t
r
100 175 ps 4
Data output fall time t
f
100 175 ps 4
LOS Fault V
LOS fault
Vcc – 0.5 Vcc
HOST
V 5
LOS Normal V
LOS norm
Vee Vee+0.5 V 5
Power Supply Rejection PSR
100 mVpp 6
Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Or open circuit.
3. Into 100 ohms differential termination.
4. 20% to 80 %
5. Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.
6. Receiver sensitivity is compliant with power supply sinusoidal modulation of 20 Hz to 2.0 MHz up to
specified value applied through the recommended power supply filtering network.
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 4
IV. Low Speed Signals
Parameter Symbol Min
Typ Max Units Notes/Conditions
RX_LOS Assert Level -30 dBm
RX_LOS Deassert Level -19 dBm
RX_LOS Hysteresis 0.5 2 dB
RX_LOS Assert Delay t_loss_on
100 µsec From detection of loss of signal
to assertion of RX_LOS
RX_LOS Negate Delay t_loss_off
100 µsec From detection of presence of
signal to negation of RX_LOS
TX_DISABLE Assert Time t_off 10 µsec
Rising edge of TX_DISABLE to
fall of output signal below 10%
of nominal
TX_DISABLE Negate Time t_on 1000 µsec Falling edge of TX_DISABLE
to rise of output signal above
90% of nominal. Time
indicated is under steady-state
temperature conditions.
TX_DISABLE Reset Time t_reset 10 µsec TX_DISABLE HIGH before
TX_DISABLE set LOW
TX_FAULT Assert 100 µsec From fault to assertion of
TX_FAULT
Initialization Time 300 msec From power on to negation of
TX_FAULT using
TX_DISABLE
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 5
V. Optical Characteristics (T
OP
= -10 to 85 °
°°
°C, V
CC
= 3.1 to 3.5 Volts)
Parameter Symbol Min Typ Max Unit Ref.
Transmitter
Output Opt. Pwr (EOL) P
OUT
0 +5 dBm 2
Optical Wavelength λ
(X-6.5) (X+6.5) nm 3
Wavelength Temperature Dependence
0.08 0.125 nm/°C
Spectral Width ∆λ
20
1 nm 4
Optical Extinction Ratio ER
8.2 dB 5
Sidemode Suppression Ratio SMSR
min
30 dB
Optical Rise/Fall Time t
r
/ t
f
180 ps 6
RIN RIN
-120 dB/Hz
Transmitter Jitter Generation
75 mUI 7
Dispersion Penalty at 50 km 2 dB 8
Optical Return Loss 24 dB
Receiver
Optical Input Power P
in
-20 -3 dBm 9
Optical Input Wavelength λ
C
1450 1620 nm
Receiver Jitter Generation 75 mUI 7
Optical Return Loss 27 dB
Notes:
1. Parameters are specified over temperature and voltage, at end of life unless otherwise noted.
2. Class 1 Laser Safety per FDA/CDRH and IEC-825-1 regulations.
3. Over case temperature of -10 to 85 °C. The Transmitter Center Wavelength “X” is as specified by the
customer. The current available wavelengths are: 1471, 1491, 1511, 1531, 1551, 1571, 1591, and 1611
nm. Please see the “Product Selection” section on page 1. It is possible to offer wavelength range
(X+5) nm to (X-7) nm. Please contact Finisar sales team for this if needed.
4. Full width, -20dB from peak.
5. Measured filtered, at 2.488 Gb/s. Min represents worst-case ER over temperature and at end of life.
6. Unfiltered, 20% to 80%.
7. Measured per GR-253
2
section 5.6 for OC-48 B.
8. SMF-28 fiber used. 50kms represents 1000ps/nm at 1610nm. Measured at 2.488Gb/s with a PRBS
2
23
-1 pattern at a BER<10
-12
.
9. P
in
represents the range of input powers where BER<10
-12
. P
in
is valid over all data rates specified in
Section VI.
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 6
VI. General Specifications
Parameter Symbol Min Typ Max Units Ref.
Data Rate BR 0.155* 2.67 Gb/sec *OC-3/12 compatible. Not
compliant w/ all OC-3/12
specifications, such as min ER
.(OC-48 compliance takes
precedence)
Total Link Budget -- 20 22 dB 2.488 Gb/s, BER < 10
-12
w/ PRBS 2
23
-1. Does not
include dispersion penalty
VII. Environmental Specifications
Parameter Symbol Min Typ Max Units Ref.
Case Operating Temperature T
op
-10 85 °C
Storage Temperature T
sto
-40 85 °C
VIII. Regulatory Compliance
Finisar CWDM SFP transceivers are Class 1 Laser Products. They are certified per the
following standards:
Feature Agency Standard
Laser Eye Safety
FDA/CDRH CDRH and IEC-825
Class 1 Laser Product.
See Note 1
Laser Eye Safety
TÜV EN 60950
EN 60825-1
EN 60825-2
Electrical Safety
CSA
CLASS 3862.07
CLASS 3862.87
Note 1: Complies with FDA performance standards for laser products except for deviations pursuant to
Laser Notice No. 50, dated July 26, 2001.
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 7
IX. Digital Diagnostic Functions
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA
5
. These SFPs use an Atmel AT24C01A 128 byte E
2
PROM with an address of A0h
(see table below for E
2
PROM contents). For details on interfacing with the E
2
PROM, see
the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS E
2
PROM.”
8
Finisar’s CWDM SFPs also support extended diagnostic features as described in Finisar
Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”
9
, and additional information is available in SFF standard titled: “Digital
Diagnostic Monitoring Interface for Optical Transceivers
10
(SFF-8472 rev9.3). A
controller IC that monitors system parameters such as laser current, module temperature,
transmitter power, and received power is accessible at address A2H.
I2C clock speed, digital diagnostic accuracy and digital diagnostic range can be found in
the table below. Values in the table represent the worst-case values over temperature,
voltage, and life.
Parameter Symbol Min
Typ
Max Units
Notes/Conditions
I
2
C Clock Speed 0 100,000 Hz Bus can be driven blind
Accuracy
Transceiver Temperature DD
Temperatu
re
-3 +3 °C Measured at controller IC
Transceiver Supply
Voltage
DD
Voltage
-3 +3 % Measured at controller IC
Tx Bias Curent DD
Bias
-10 +10 %
Tx Output Power DD
TxPower
-3 +3 dB 100% tested in production
tested at room temp to ±2 dB
Received Average Power DD
RxPower
-3 +3 dB 100% tested in production
tested at room temp to ±2 dB
Range
Transceiver Temperature DD
Temperatu
re
-40 85 °C
Transceiver Supply
Voltage
DD
Voltage
3.0 4.0 V
Tx Bias Curent DD
Bias
0 90 mA
Tx Output Power DD
TxPower
-10 5 dBm
Received Average Power DD
RxPower
-23 0 dBm
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 8
X. Mechanical Specifications
Finisar’s Multi-rate CWDM Small Form Factor Pluggable (SFP) transceivers are
compatible with the dimensions defined by the SFP Multi-Sourcing Agreement (MSA).
FWLF1521P2Nxx Outline Drawing - units in inches [mm]
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 9
XI. PCB Layout and Bezel Recommendations
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 10
connected to the SFP transceiver.
FWLF1521P2Nxx SFP Product Specification – Jan 2008
F i n i s a r
Finisar Corporation Jan 2008 Rev.A Preliminary and Confidential Page 11
XII. References
1. “SONET Transport Systems: Common Generic Criteria”, Telcordia Technologies,
GR-253-CORE, Issue 3, Sept 2000.
2. IEEE Std 802.3. IEEE Standards Department, 2000.
(*)
3. “Fibre Channel Draft Physical Interface Specification (FC-PI 10.0)”. American
National Standard for Information Systems.
(*)
4. “Optical Interfaces for Course Wavelength Division Multiplexing Applications”,
ITU-T recommendation G.695, January 2005.
5. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA),
September 2000. Documentation is currently available at Finisar upon request.
6. Directive 2002/95/EC of the European Council Parliament and of the Council, “on
the restriction of the use of certain hazardous substances in electrical and electronic
equipment”. January 27, 2003.
7. “Application Note AN-2038: Finisar Implementation Of RoHS Compliant
Transceivers”, Finisar Corporation, January 21, 2005.
8. “AT24C01A/02/04/08/16 2-Wire Serial CMOS E
2
PROM”, Atmel Corporation.
www.Atmel.com
9. “Application Note AN-2030: Digital Diagnostic Monitoring Interface for Optical
Transceivers”, Finisar Corporation, April 2002.
10. “Digital Diagnostic Monitoring Interface For Optical Transceivers Rev 9.3”. SFF
Document No. SFF-8472.
(*) Neither IEEE 802.3 nor FC-PI 10.0 specifies a 1621 nm DFB single mode interface.
The FWLF1521P2Nxx complies with these specifications except for the following
optical parameters, which have different values: transmitter wavelength, extinction ratio,
receiver sensitivity, and transmit output power. See Section V for details.
For More Information
Finisar Corporation
1308 Moffett Park Drive
Sunnyvale, CA 94089-1133
Tel. 1-408-548-1000
Fax 1-408-541-6138
sales@finisar.com
www.finisar.com
