COMMUNICATIONS MODULES & SUBSYSTEMS
DWDM SFP Optical Transceiver—C-Band for up to 180 km Reach
SFP Series
Key Features
• Support line rate from 100 Mbps to 3.1 Gbps
• SFP MSA INF-8074i Revision 1.0 and DWDM SFP MSA
Revision 1.0 compliant
• Up to 180 km reach, DWDM with 100 GHz ITU Grid,
C-band applications
• Operating temperature range of -5˚C to 70˚C or -40˚C to 85˚C
• Maximum power dissipation of 1.3 W for -5˚C to 70˚C tem-
perature range, or 1.5 W for -40˚C to 85˚C temperature range
• RoHS 6/6 compliant
• Single 3.3 V power supply
• Enhanced digital diagnostic monitoring support
Applications
• Internal AC-coupled electrical interface
• Dense WDM applications
• SONET OC-3/12/48 applications
• SDH STM-1/4/16 applications
• Fast Ethernet and Gigabit Ethernet
applications
• Fibre Channel applications
Compliance
• SFF 8074i MSA
• SFF 8472 Revision 10.3
• DWDM SFP MSA
• ITU-T G.957
• IEEE 802.3-2005
• Class 1 Laser Safety
• Compliance with Telcordia GR-468
The JDSU RoHS-compliant small form factor pluggable (SFP) optical transceiver
is an integrated fiber optic transceiver that provides a high-speed serial link at
signaling rates from 100 Mbps to 3.1 Gbps. The module complies with the SFP
multisource agreement (MSA) and the dense wavelength division multiplexing
(DWDM) SFP MSA.
The DWDM SFP optical transceiver complies with ITU-T G.957 with 100 GHz
ITU grid channel spacing for up to 180 km reach (SONET OC-48/SDH STM-16);
and IEEE 802.3-2005 DWDM for 180 km reach (Gigabit Ethernet and 1 G Fibre
Channel) standards. The JDSU DWDM SFP optical transceiver is compatible with
Fast Ethernet, SONET OC-3 and OC-12, and SDH STM-1 and STM-4 standards.
Our DWDM SFP optical transceiver integrates the receive and transmit path
on one module. In the transmit side, the serial data stream is passed to a laser
driver. The laser drivers biases and modulates a cooled direct modulated laser
(DML), enabling data transmission over single-mode fiber through an industry
standard LC connector. In the receive side, the optical data stream is recovered
from an avalanche photodiode (APD) photodetector, transimpedance amplifier,
and passed to a post amplifier. This module also features a hot-pluggable, SFI-
compliant electrical interface.
NORTH AMERICA: 800 498-JDSU (5378)
WORLDWIDE: +800 5378-JDSU
WEBSITE: www.jdsu.com
DWDM SFP OPTICAL TRANSCEIVER
—C-BAND FOR UP TO 180 KM REACH
2
Section 1
Functional Description
The RoHS-compliant SFP optical transceiver is a fully duplexed serial electric, se-
rial optical device with both transmit and receive functions contained in a single
module that provides a high-speed serial link at signaling rates from 100 Mbps to
3.1 Gbps. It is compliant with Telcordia GR-253-CORE and ITU-T G.957 with 100
GHz ITU grid channel spacing for 180 km reach (SONET OC-48 / SDH STM-16);
and IEEE 802.3-2005 DWDM for 180 km reach (Gigabit Ethernet and 1 G Fibre
Channel) applications. The DWDM SFP optical transceiver is compatible to Fast
Ethernet, SONET OC-3 and OC-12, and SDH STM-1 and STM-4 applications.
The transceiver is also fully compliant with the SFP module MSA INF8074i Rev.
1.0. A block diagram of the DWDM SFP optical transceiver is shown in Figure 1.
The DWDM SFP optical transceiver does not need rate select to operate at the
designated line rate. It has several low-speed interface connections, including a
two-wire serial interface. These connections also include transceiver presence
(Mod_Def(0)), transmitter fault (TX_FAULT), transmitter disable (TX_DIS), and
receive loss (RX_LOS).
Transmitter
The transmitter path converts serial NRZ electrical data from line rate of 100 Mbps
to 3.1 Gbps to a standard compliant optical signal. The transmitter accepts a 100
Ω
differential 400 mV peak-to-peak to 2400 mV peak-to-peak CML electrical signal on
TD- and TD+ pins.
Inside the module, the differential signals pass through a laser driver, which
transforms the small swing digital voltage to an output modulation that drives
a cooled DML laser. The optical signal is engineered to meet the SONET / SDH,
Ethernet, and Fibre Channel rates DWDM specifications at ITU grids with 100 GHz
channel spacing. Closed-loop control of the transmitted laser power, modulation
swing and center wavelength over temperature and voltage variations is provided.
The laser is coupled to single-mode optical fiber through an industry-standard LC
optical connector.
Receiver
The receiver converts incoming DC balanced serial NRZ optical data from line
rate of 100 Mbps to 3.1 Gbps into serial electrical data. Light is coupled to an APD
photodetector from single-mode optical fiber through an industry-standard LC
optical connector. The electrical current from the APD photodetector is converted
to a voltage in a high-gain transimpedance amplifier.
The amplified signal is passed to a post amplifier. Loss of signal and signal lock detec-
tion is included in the receive circuitry that is reflected in the RX_LOS status pin. The
recovered data is output on the RD+ and RD- pins as a 100
Ω
differential 400 mV to
800 mV peak-to-peak CML signal. The output signal meets SFP MSA requirements.
DWDM SFP OPTICAL TRANSCEIVER
—C-BAND FOR UP TO 180 KM REACH
3
Low-speed Signaling
Low-speed signaling is based on low voltage TTL (LVTTL) operating at a nominal
voltage of 3.3 V.
MOD_DEF(1) / MOD_DEF(2): Two-wire serial interface clock and data line.
Hosts should use a pull-up resistor connected to Vcc 3.3 V on the two-wire inter-
face MOD_DEF(1) (clock), MOD_DEF(2) (data), and all low-speed outputs.
TX_FAULT: Output pin. When high, indicates possible transmitter operational
fault or a status critical to the host system.
TX_DIS: Input pin. When asserted high, the transmitter output is turned off.
Mod_DEF(0): Output pin. Pulled to ground by the module to indicate that the
module is present.
RX_LOS: Output pin. Asserted high when insufficient optical power for reliable
signal reception is received.
V
ccT
V
ccR
V
eeT
V
eeR
Power Supply Sequence
Transceiver Ground
ROSA
RD-
RD+
Post Amplifier
TIA
MOD_DEF(1)
MOD_DEF(2)
TD-
TD+
RX_LOS
TX_FAULT
TX_DIS
MCU
TEC
Controller
Laser Driver
TOSA
MOD_DEF(0)
TX_DIS
Figure 1
DWDM SFP optical transceiver functional block diagram
DWDM SFP OPTICAL TRANSCEIVER
—C-BAND FOR UP TO 180 KM REACH
4
Section 2
Application Schematics
Power supply filtering is recommended for the DWDM SFP optical transceiver.
To limit wide band noise power, the host system and module shall each meet a
maximum of two percent peak-to-peak noise when measured with a 1 MHz low
pass filter. In addition, the host system and the module shall each meet a maximum
of three percent peak-to-peak noise when measured with a filter from 1 – 10 MHz.
Recommended power supply network connections to the DWDM SFP optical
transceiver are shown in Figure 2.
Host Board
1μH
0.1μF
3.3V
1μH
10μF
0.1μF
10μF
0.1μF
V
ccT
SFP
Transceiver
V
ccR
Notes:
1. Power supply filtering components should be placed as close to the Vcc pins of the host connector as possible for optimal performance.
2. ESR of inductor should be less than 0.5
Ω
to ensure proper power supply levels.
Figure 2
Application schematics for the DWDM SFP optical transceiver
DWDM SFP OPTICAL TRANSCEIVER
—C-BAND FOR UP TO 180 KM REACH
5
Section 3
Specifications
Technical specifications related to the DWDM SFP optical transceiver includes:
• Section 3.1
Pin Function Definitions
• Section 3.2
Absolute Maximum Ratings
• Section 3.3
Electrical Characteristics
• Section 3.4
Jitter Specifications
• Section 3.5
Timing Requirement of Control and Status I/O
• Section 3.6
SFP Two-wire Interface Protocol and Management Interface
• Section 3.7
Optical Transmitter Characteristics
• Section 3.8
Optical Receiver Characteristics
• Section 3.9
Wavelength Availability
• Section 3.10 Regulatory Compliance
• Section 3.11 Module Outline
• Section 3.12 Connectors
3.1
Pin Function Definitions
Figure 3
SFP optical transceiver pin-out on host board
FPGA/CPLD
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