1550nm DFB Laser Fiber Optic Modules 1.25Gbps 120km SFP Fiber Module
1.25Gbps 120km SFP Optical Transceiver
The SFP transceivers are high performance, cost-effective modules supporting dual data-rate of 1.25Gbps and 120km transmission distance with SMF. The transceiver consists of three sections: a DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA), and an MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.
Features
- Dual data-rate of 1.25Gbps operation
- 1550nm DFB laser and PIN photodetector for 120km transmission
- Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
- Digital Diagnostic Monitoring:
- Internal Calibration or External Calibration
- Compatible with RoHS
- Compatible with CE
- +3.3V single power supply
- Operating case temperature:
- Standard: 0 to +70°C
- Industrial: -40 to +85°C
Applications
- Gigabit Ethernet
- Fiber Channel
- Switch to Switch interface
- Switched backplane applications
- Router/Server interface
- Other optical transmission systems
Absolute Maximum Rating
| Parameters | Symbol | Min. | Max. | Unit |
| Power Supply Voltage | VCC | -0.5 | +4.0 | V |
| Storage Temperature | Tc | -40 | +85 | C |
| Relative Humidity | RH | 5 | 85 | % |
Recommended Operating Environment
| Parameter | Symbol | Min | Typical | Max | Unit | |
| Operating Case Temperature | Standard | Tc | 0 | +70 | °C | |
| Industrial | -40 | +85 | °C | |||
| Power Supply Voltage | Vcc | 3.13 | 3.3 | 3.47 | V | |
| Power Supply Current | Icc | 300 | mA | |||
| Data Rate | 1.25 | Gbps | ||||
Optical and Electrical Characteristics
| Parameter | Symbol | Min | Typical | Max | Unit | Notes | |
| Transmitter | |||||||
| Centre Wavelength | λc | 1480 | 1550 | 1580 | nm | ||
| Spectral Width (RMS) | σ | 1 | nm | ||||
| Side Mode Suppression Ratio | SMSR | 30 | dB | ||||
| Average Output Power | Pout | 0 | 5 | dBm | 1 | ||
| Extinction Ratio | ER | 9 | dB | ||||
| Optical Rise/Fall Time (20%~80%) | tr/tf | 0.26 | ns | ||||
| Data Input Swing Differential | VIN | 400 | 1800 | mV | 2 | ||
| Input Differential Impedance | ZIN | 90 | 100 | 110 | Ω | ||
| TX Disable | Disable | 2.0 | Vcc | V | |||
| Enable | 0 | 0.8 | V | ||||
| TX Fault | Fault | 2.0 | Vcc | V | |||
| Normal | 0 | 0.8 | V | ||||
| Receiver | |||||||
| Centre Wavelength | λc | 1260 | 1580 | nm | |||
| Receiver Sensitivity | -30 | dBm | 3 | ||||
| Receiver Overload | -9 | dBm | 3 | ||||
| LOS De-Assert | LOSD | -32 | dBm | ||||
| LOS Assert | LOSA | -35 | dBm | ||||
| LOS Hysteresis | 0.5 | 4.5 | dB | ||||
| Data Output Swing Differential | Vout | 400 | 1800 | mV | 4 | ||
| LOS | High | 2.0 | Vcc | V | |||
| Low | 0.8 | V | |||||
Notes:
- The optical power is launched into SMF.
- PECL input, internally AC-coupled and terminated.
- Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
- Internally AC-coupled.
Timing and Electrical
| Parameter | Symbol | Min | Typical | Max | Unit |
| Tx Disable Negate Time | t_on | 1 | ms | ||
| Tx Disable Assert Time | t_off | 10 | µs | ||
| Time to Initialize, including Reset of Tx Fault | t_init | 300 | ms | ||
| Tx Fault Assert Time | t_fault | 100 | µs | ||
| Tx Disable to Reset | t_reset | 10 | µs | ||
| LOS Assert Time | t_loss_on | 100 | µs | ||
| LOS De-assert Time | t_loss_off | 100 | µs | ||
| Serial ID Clock Rate | f_serial_clock | 400 | KHz | ||
| MOD_DEF (0:2)-High | VH | 2 | Vcc | V | |
| MOD_DEF (0:2)-Low | VL | 0.8 | V |
Diagnostics
| Parameter | Range | Unit | Accuracy | Calibration |
| Temperature | 0 to +70 | °C | ±3°C | Internal / External |
| -20 to +85 | ||||
| Voltage | 3.0 to 3.6 | V | ±3% | Internal / External |
| Bias Current | 0 to 100 | mA | ±10% | Internal / External |
| TX Power | 0 to +5 | dBm | ±3dB | Internal / External |
| RX Power | -30 to -9 | dBm | ±3dB | Internal / External |
Digital Diagnostic Memory Map
The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).
The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.
Pin Definition
| Pin | Signal Name | Description | Plug Seq. | Notes |
| 1 | VEET | Transmitter Ground | 1 | |
| 2 | TX FAULT | Transmitter Fault Indication | 3 | Note 1 |
| 3 | TX DISABLE | Transmitter Disable | 3 | Note 2 |
| 4 | MOD_DEF(2) | SDA Serial Data Signal | 3 | Note 3 |
| 5 | MOD_DEF(1) | SCL Serial Clock Signal | 3 | Note 3 |
| 6 | MOD_DEF(0) | TTL Low | 3 | Note 3 |
| 7 | Rate Select | Not Connected | 3 | |
| 8 | LOS | Loss of Signal | 3 | Note 4 |
| 9 | VEER | Receiver ground | 1 | |
| 10 | VEER | Receiver ground | 1 | |
| 11 | VEER | Receiver ground | 1 | |
| 12 | RD- | Inv. Received Data Out | 3 | Note 5 |
| 13 | RD+ | Received Data Out | 3 | Note 5 |
| 14 | VEER | Receiver ground | 1 | |
| 15 | VCCR | Receiver Power Supply | 2 | |
| 16 | VCCT | Transmitter Power Supply | 2 | |
| 17 | VEET | Transmitter Ground | 1 | |
| 18 | TD+ | Transmit Data In | 3 | Note 6 |
| 19 | TD- | Inv. Transmit Data In | 3 | Note 6 |
| 20 | VEET | Transmitter Ground | 1 |
Notes: Plug Seq.: Pin engagement sequence during hot plugging.
- TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.
- TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7k~10kΩ resistor. Its states are:
Low (0 to 0.8V): Transmitter on
(>0.8V, < 2.0V): Undefined
High (2.0 to 3.465V): Transmitter Disabled
Open: Transmitter Disabled
- Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.
Mod-Def 0 is grounded by the module to indicate that the module is present
Mod-Def 1 is the clock line of the two-wire serial interface for serial ID
Mod-Def 2 is the data line of the two-wire serial interface for serial ID
- LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.
- RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.
- TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.
Regulatory Compliance
LinkWell SFP transceiver is designed to be Class I Laser safety compliant and is certified per the following standards:
| Feature | Agency | Standard |
| Laser Safety | FDA | CDRH 21 CFR 1040 and Laser Notice No. 50 |
| Product Safety | UL | UL and CUL EN60950-2: 2007 |
| Environmental protection | SGS | RoHS Directive 2002/95/EC |
| EMC | CCIC | EN 55022: 2006+A1: 2007
EN 55024: 1998+A1+A2: 2003 |
Ordering Information
| Part Number | Product Description |
| LW-SFP-1512-120D | SFP, 1550nm, 1.25Gbps, 120km, 0ºC ~ +70ºC, With Digital Diagnostic Monitoring |
| LW-SFP -1512-120DI | SFP, 1550nm, 1.25Gbps, 120km, -40ºC ~ +85ºC, With Digital Diagnostic Monitoring |
References
- Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000.
- Telcordia GR-253-CORE and ITU-T G.957 Specifications.
Important Notice
Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by LinkWell before they become applicable to any particular order or contract. In accordance with the LinkWell policy of continuous improvement specifications may change without notice.
The publication of information in this data sheet does not imply freedom from patent or other protective rights of LinkWell or others. Further details are available from any LinkWell sales representative.
About Linkwell
Bringing Better Connections
Linkwell is a Fiber Optic company, focused as a “Reliable Partner” on offering solution and suitable products to Operators and Partners.
With our 9 years vendor experience for China Telecom, We combine installation experience, inspection experience, manufacturing experience, and delivering experience es to deliver first-in-class solutions and products.
LinkWell was initially founded by 33-Year experienced Engineers, 21-years-experienced Factory Owner and 16-Years experienced coustanlt.
At LinkWell, All of our staff are trained to adopt a customer driven approach as our strategic focus with fundamental values and generally accepted moral principles such as respect and honesty being the basis of all our dealings.
These inculcated values in our staff has led to the establishment of LinkWell as a mainstay force in this industry.
Our staff have been extensively trained to harness the company’s strategic strengths and core competencies in order to provide the highest level of satisfaction to our valued clients.
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