COMMUNICATIONS MODULES & SUBSYSTEMS
2.5 Gb/s CWDM SFP Transceiver (Multirate)
CT2 Series
Key Features
• SFP MSA compatible
• 2.5 Gb/s compliant CWDM performance for short haul
and long haul
• Microprocessor-based design fully implements the Digital
Diagnostic Monitoring Interface
• Automatic output power and extinction ratio control over
temperature and lifetime to compensate for laser efficiency
degradation
• Both PIN and APD versions meet -27 dB receiver reflectance
• Optical parameters tuned and optimized over temperature
in production test
Applications
•
•
•
•
Metro access
Metro core
Wide area networks
Optical crossconnects
Compliance
The JDSU CT2 Series 2.5 Gb/s Coarse Wavelength Division Multiplexing
(CWDM) transceiver integrates optics and electronics in a Small Form Factor
Pluggable (SFP) package. It is Multisource Agreement (MSA) compatible and
designed for CWDM operation per ITU-T G.695 for unidirectional 8 channel
black-link transmission (S-C8S1-1DX and S-C8L1-1DX). Although optimized
for 2.5 Gb/s, the CT2 provides multi-rate capabilities and can be used for various
protocols ranging from OC-3 (155 Mb/s) up to 2.7 Gb/s including 622 Mb/s,
1x/2x FC, GbE and 2x GbE.
The CT2 Series CWDM SFP transceiver provides a fully G.695 8 channel black-
link compliant interface between the optical Mux/Demux photonic layer and the
electrical layer. Its microprocessor-based modular design implements all features
specified in the SFP MSA compatible 2-wire Serial Digital Diagnostic Monitoring
Interface for Optical Transceivers.
The major components in this module include an uncooled distributed feedback
(DFB) based optical transmitter, a PIN or APD based optical receiver with
integrated transimpedence amplifier (TIA), an APD high voltage circuit (if
required), a microprocessor, a limiting post amplifier, and a laser driver. This
CWDM transceiver design offers a "hot-pluggable" interface and is available in
short haul (40 km, PIN) and long haul (80 km, APD) configurations.
• GR-253-CORE
• ITU-T G.957
• SFF-8472 Revision 9.3
• ITU-T G.695
NORTH AMERICA
:
800 498-JDSU (5378)
WORLDWIDE
:
+800 5378-JDSU
WEBSITE
:
www.jdsu.com
2.5 GB/S CWDM SFP TRANSCEIVER
2
Dimensions Diagram
(Specifications in mm unless otherwise noted; see dimensions table on next page.)
K REF
J MIN
A
A
F REF
D
F REF
A
M
C
P
N
Y MAX
B
H MAX
L MIN X 45°
Y MAX
G REF
Section A-A
S
R MAX
See Detail Y
Q
W
T
U
X REF
V
AG
AF
AA REF
AE REF
Z
Z
Z
AB MAX
Detail Y
Section Z-Z
2.5 GB/S CWDM SFP TRANSCEIVER
3
Dimension Table for the CT2
Designator
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
W
X
Y
Z
AA
AB
AE
Dimension
13.7 mm
8.6 mm
8.5 mm
13.4 mm
1.0 mm
2.3 mm
4.2 mm
2.0 mm
28.5 mm
55.0 mm
1.1 mm x 45°
2.0 mm
2.25 mm
1.0 mm
9.2 mm
0.7 mm
45.0 mm
34.6 mm
41.8 mm
2.7 mm
2.7 mm
7.3 mm
2.0 mm
0.45 mm
8.6 mm
2.6 mm
6.0 mm
Tolerance
±0.1 mm
±0.1 mm
±0.1 mm
±0.1 mm
Maximum
Reference
Reference
Maximum
Minimum
Reference
Minimum
±0.25 mm
±0.1 mm
±0.1 mm
±0.1 mm
Maximum
±0.2 mm
±0.3 mm
±0.15 mm
±0.05 mm
±0.1 mm
Reference
Maximum
±0.05 mm
Reference
Maximum
Reference
Comments
Transceiver width, nose piece or front that extends inside cage
Transceiver height, front, that extends inside cage
Transceiver height, rear
Transceiver width, rear
Extension of front sides outside of cage
Location of cage grounding springs from centerline, top
Location of side cage grounding springs from top
Width of cage grounding springs
Location of transition between nose piece and rear of transceiver
Transceiver overall length
Chamfer on bottom of housing
Height of rear shoulder from transceiver printed circuit board
Location of printed circuit board to bottom of transceiver
Thickness of printed circuit board
Width of printed circuit board
Width of skirt in rear of transceiver
Length from latch shoulder to rear of transceiver
Length from latch shoulder to bottom opening of transceiver
Length from latch shoulder to end of printed circuit board
Length from latch shoulder to shoulder of transceiver outside of cage
(location of positive stop)
Clearance for actuator tines
Transceiver length extending outside of cage
Maximum length of top and bottom transceiver extending outside of cage
Height of latch boss
Transceiver height, front, that extends inside the cage
Length of latch boss
Width of cavity that contains the actuator
Bail Latch Color Code Definition
Bail Latch Color
Gray
Violet
Blue
Green
Yellow
Orange
Red
Brown
Wavelength
1471 nm
1491 nm
1511 nm
1531 nm
1551 nm
1571 nm
1591 nm
1611 nm
Typical Reach
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
Short haul/Long haul
2.5 GB/S CWDM SFP TRANSCEIVER
4
CT2 Electrical Pad Layout
20
19
18
17
16
15
14
13
12
11
VeeT
TD-
TD+
VeeT
VccT
VccR
VeeR
RD+
RD-
VeeR
1
2
3
4
5
6
7
8
9
10
VeeT
Tx Fault
Tx Disable
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
Rate Select
LOS
VeeR
VeeR
Top of Board
Bottom of Board (As Viewed
through Top of Board)
Transceiver Pin Descriptions
Pin
TD
TDb
RD
RDb
Rate_select
TxDIS
LOS
Description
Un-clocked, multirate, differential serial bit stream (155 Mb/s to 2.7 Gb/s) used to drive the optical transmitter.
Internally AC coupled and terminated via internal 100
Ω
differential impedence.
Differential received electrical signal capable of detecting 155 Mb/s to 2.7 Gb/s bit patterns.
The differential pair is internally biased and AC coupled. This signal requires 100
Ω
external differential termination.
Internally monitored and available for future use. Can be customized for specific applications.
Transmitter Disable Input. A logic HIGH on this input pin disables the transmitter's laser so that there is no optical
output. If left open the transmitter will be disabled.
Loss of Signal (Open Collector). A logic HIGH on this output indicates an incoming signal level that is less than -25 dBm
but no greater than -31 dBm for the 40 km configuration and less than -34 dBm but no greater than -40 dBm for the
80 km configuration. LOS shall deassert (logic LOW) when a 3 dB (maximum), 0.5 dB (minimum) hysteresis is obtained.
Transmitter fault (Open collector). A logic HIGH indicates that the transmitter is in a fault condition.
MOD_DEF(0) is internally grounded to indicate the presence of the module. Must be pulled-up on host board with
10 KΩ resistor.
MOD_DEF(1) is the clock of the 2 wire interface for module monitoring.
MOD_DEF(2) is the data line of the 2 wire interface for module monitoring.
Receiver, Transmitter power supply, respectively
Receiver, Transmitter ground, respectively. The chassis ground and circuit ground isolation is configurable.
Tx_fault
MOD_DEF(0)
MOD_DEF(1)
MOD_DEF(2)
VccR,VccT
VeeR, VeeT
2.5 GB/S CWDM SFP TRANSCEIVER
5
Absolute Maximum Ratings
Parameter
Standard operating case temperature range
Extended operating case temperature range
Storage case temperature range
Supply voltage
Voltage on any input/output pin
High-speed output source current
Lead soldering temperature/time
Operating relative humidity (non-condensing)
Receiver optical input power
PIN
APD
Minimum
0 °C
-5 °C
-40 °C
-0.5 V
0V
-
-
5%
-
-
Maximum
70 °C
85 °C
85 °C
4.0 V
Vcc
50 mA
250 °C/10 seconds
85%
3 dBm
0 dBm
Transceiver Electrical Input/Output Characteristics
(Vcc = 3.3 V±5%)
Parameter
Input data signal levels input voltage swing, DVIN (internally AC coupled)
Transmitter disable input (disabled/enabled)
Rate select input (high data rate/low data rate)
Transmitter fault output (asserted/deasserted)
Output data signal levels1 output voltage swing, DVOUT (internally AC coupled)
Loss-of-signal output (output high, VOH/output low, VOL)
Minimum
200 mV
2.0 V/0 V
2.8 V/0 V
2.4 V/0 V
400 mV
2.4 V/0 V
Maximum
2000 mV
Vcc/0.8 V
Vcc/0.6 V
Vcc/0.5 V
2000 mV
Vcc/0.5 V
1. Terminated into 100
Ω
differential. These levels are guaranteed down to 2 dB lower than the typical receiver sensitivity for each data rate and reach.
