1.25G DWDM SFP 120KM LC SMF Fiber Optic Transceiver Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA) and SFF-8472. The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the DFB laser and the APD .The module data link up to 120KM in 9/125um single mode fiber. It offers a simple and convenient way to interface PCBs to single mode fiber optic cables in Dense Wavelength Division Multiplexing (DWDM) applications. It is a high performance, cost effective module for serial optical data communication applications。
The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.
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
VEER
Receiver Ground (Common with Transmitter Ground)
1
10
VEER
Receiver Ground (Common with Transmitter Ground)
1
11
VEER
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
VEER
Receiver Ground (Common with Transmitter Ground)
1
15
VCCR
Receiver Power Supply
16
VCCT
Transmitter Power Supply
17
VEET
Transmitter Ground (Common with Receiver Ground)
1
18
TD+
Transmitter Non-Inverted DATA in. AC Coupled.
19
TD-
Transmitter Inverted DATA in. AC Coupled.
20
VEET
Transmitter Ground (Common with Receiver Ground)
1
Note:
Circuit ground is internally isolated from chassis ground.
Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
Should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V.MOD_DEF (0) pulls line low to indicate module is plugged in.
This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:
Low (0 – 0.8V): Reduced Bandwidth
(>0.8, < 2.0V): Undefined
High (2.0 – 3.465V): Full Bandwidth
Open: Reduced Bandwidth
LOS is open collector output should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
2. Absolute Maximum Ratings
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Storage Temperature
TS
-40
85
°C
Storage Ambient Humidity
HA
5
95
%
Power Supply Voltage
VCC
-0.5
4
V
Signal Input Voltage
-0.3
Vcc+0.3
V
Receiver Damage Threshold
5
dBm
3. Recommended Operating Conditions
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Case Operating Temperature
Tcase
0
70
°C
Power Supply Voltage
VCC
3.13
3.3
3.47
V
Power Supply Current
ICC
500
mA
Power Supply Noise Rejection
100
mVp-p
100Hz to 1MHz
Data Rate
1250/1250
Mbps
TX Rate/RX Rate
Transmission Distance
120
KM
Coupled Fiber
Single mode fiber
9/125um SMF
4. Specification of Transmitter
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Center Wavelength Spacing
100
GHz
Center Wavelength
λ
X-100
X
X+100
pm
Note (1)
Average Output Power
POUT
0
5
dBm
Extinction Ratio
ER
9
dB
Side Mode Suppression Ratio
SMSR
30
dB
Spectrum Bandwidth(-20dB)
σ
0.3
nm
Transmitter OFF Output Power
POff
-45
dBm
Differential Line Input Impedance
RIN
90
100
110
Ohm
Output Eye Mask
Compliant with IEEE 802.3Z
Note (2)
Note (1): X = specified ITU center wavelength. (To See “Ordering Information”)
Note (2): Transmitter eye mask definition.
5. Specification of Receiver
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Input Optical Wavelength
λIN
1270
1610
nm
APD
Receiver Sensitivity
PIN
-31
dBm
Note (1)
Input Saturation Power (Overload)
PSAT
-6
dBm
LOS Assert
LOSA
-40
-32
dBm
LOS De-assert
LOSD
dBm
Note (2)
LOS Hysteresis
0.5
2
6
dB
Note (1): Measured with Light source 1550nm, ER=9dB; BER =<10^-12 @PRBS=2^23-1 NRZ
Note (2): When LOS de-asserted, the RX data+/- output is High-level (fixed)
6. Electrical Interface Characteristics
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Transmitter
Total Supply Current
ICC
A
mV
Note (1)
Transmitter Disable Input-High
VDISH
2
Vcc+0.3
V
Transmitter Disable Input-Low
VDISL
0
0.8
V
Transmitter Fault Input-High
VDISL
2
Vcc+0.3
V
Transmitter Fault Input-Low
VTxFH
0
0.8
V
Receiver
Total Supply Current
ICC
B
mA
Note (1)
LOSS Output Voltage-High
VLOSH
2
Vcc+0.3
V
LVTTL
LOSS Output Voltage-Low
VLOSL
0
0.8
V
Note (1): A (TX) + B (RX) = 500mA (Not include termination circuit)
7 .Digital Diagnostic Functions
1.25G DWDM SFP 120KM LC SMF Fiber Optic Transceiver support the 2-wire serial communication protocol as defined in the SFP MSA. It is very closely related to the E2PROM defined in the GBIC standard, with the same electrical specifications.
The standard SFP serial ID provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information.
Additionally, Zion SFP transceivers provide a unique enhanced digital diagnostic monitoring interface, which allows real-time access to device operating parameters such as transceiver temperature, laser bias current, transmitted optical power, received optical power and transceiver supply voltage .It also defines a sophisticated system of alarm and warning flags, which alerts end-users when particular operating parameters are outside of a factory set normal range.
The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.
The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. When the serial protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host. The positive edge clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.
8. Recommend Circuit Schematic
9. Mechanical Specifications (Unit: mm)
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