FA-TCS12L35-20D & FA-TCS12L53-20D, Bi-Directional Transmission 1.25Gbps SFP Fiber Optic Transceiver Module 20Km DDM
Main Technical Parameters of Optical Transceiver
1, Average transmitting power Po: Refers to the arithmetic average value of optical power when signal logic is 1 and 0. PAWG= (P0+P1)/2;
2, Extinction ratio (Pon/Poff): The comparative value when signal logic is 1 and 0. ER=10log P1/P0;
3, Center wavelength: optical band is used to transmit optical signal. Mainly use 850nm, 1310nm and 1550nm;
4, Eye diagram pattern: in high speed optical fiber system, optical transmit pulse shape is difficult to control, often may be rising edge, falling edge overshoot, undershoot and ringing. All of these may lead to worsening of the sensitivity of the receiver, and therefore must be limited, so ITU-T proposed G.957 specify a eye diagram template;
5, Receiving sensitivity Pr: Receiving sensitivity means when the module is working, the minimum receiving power based on a certain error value (such as BER=10-9);
6, Saturated optical power Ps: means when the module is working, the maximum receiving power based on a certain error value (such as BER=10-9);
7, Alarm (H-L): when the module is working, change optical power in descending order, the alarm output signal level reversal appears when the optical power decreases to a certain value, optical power at this time is the alarm signal threshold (PH-L);
8, Cancel alarm (L-H): when the module is working, change optical power in ascending order, the alarm output signal level reversal appears when the optical power increases to a certain value, optical power at this time is the alarm signal threshold (PL-H).
9, Optical Path Penalty: It is receiver’s sensitivity changes caused by pulse transmission in the optical channel. Factors causing the Optical Path Penalty mainly includes the nonlinear effects, chromatic dispersion (CD), polarization mode dispersion (PMD), polarization dependent loss (PDL), optical channel reflection and crosstalk etc..
10, Optical Link budget: It is equal to the absolute value of optical power subtract receiving sensitivity, it is the key to evaluate transmission distance.
11, Optical power penalty at different wavelength: For example, G652 SM fiber, loss is 0.4dB/km @ 1310nm and 0.25dB/km @ 1550nm; 50um MM fiber, loss is 4dB/km at 850nm and 2dB/km at 1310nm.
So main technical parameters of fiber optic transceiver includes: Average transmitting power Po; Extinction ratio (Pon/Poff); Center wavelength; Eye diagram pattern:; Receiving sensitivity Pr; Saturated optical power Ps; High-Low Alarm (H-L); Optical Path Penalty; Optical Link budget; Optical power penalty at different wavelength and so on.
Optical and Electrical Characteristics Of FA-TCS12L35-20D & FA-TCS12L53-20D
| Parameter | Symbol | Min | Typical | Max | Unit | Notes |
| Transmitter |
| Center Wavelength | λc | 1260 | 1310 | 1360 | nm | |
| Spectral Width (RMS) | ∆λ | | | 4 | nm | |
| Average Output Power | Pout | -9 | | 0 | 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 |
| Center Wavelength | λc | 1480 | | 1580 | nm | |
| Receiver Sensitivity | | | | -23 | dBm | 3 |
| Receiver Overload | | -3 | | | dBm | 3 |
| LOS De-Assert | LOSD | | | -24 | dBm | |
| LOS Assert | LOSA | -30 | | | dBm | |
| LOS Hysteresis | | 1 | | 4 | dB | |
| Data Output Swing Differential | Vout | 400 | | 1800 | mV | 4 |
| LOS | High | 2.0 | | Vcc | V | |
| Low | | | 0.8 | V | |
Product Features
1, Suitable for Gigabit Ethernet, fiber channel, WDM applications;
2, SFP Multi-source package with LC interface;
3, Up to 1.25Gbps data links;
4, Single fiber bi-directional transmission;
5, Support Hot-Pluggable;
6, Single +3.3V power supply;
7, Isolation > 30dB, Cross Talk < -45dB;
8, Compliant with Specifications for IEEE802.3Z;
9, Compliant with Bellcore TA-NWT-000983;
10, Eye safety level meet Laser Class1 and compliant with IEC60825-1 requirements.
Product Tags:
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Bidirectional Fiber Optic Transceiver LC SFP Module For Gigabit Ethernet Images
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