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Description
Features of 25g CWDM SFP28
- Supports 24.3Gbps to 26.5Gbps bit rates
- CWDM DFB Laser and APD photo-detector
- Up to 15kmon 9/125µm SMF
- Duplex LC receptacle optical interface compliant
- Hot pluggable
- All-metal housing for superior EMI performance
- RoHS6 compliant (lead free)
- Operating case temperature: Commercial: -5ºC to +70°C; Extended: -20ºC to +80°C; Industrial: -40ºC to +85°C
Applications
- For 5G CRAN deployments within a 10-15km range, the AAU-DU connection and complex transmission paths that require higher link budgets;
- Connecting data centers or access points in urban edge areas;
- When two data centers are far apart and fiber resources are insufficient, requiring the use of wavelength division multiplexing technology, 15km CWDM provides a compromise solution that balances distance and channel density.
Standards
- Compliant with INF-8431
- Compliant with SFF-8472
- Compatible with IEEE802.3cc
Optical Parameters
| Parameter | Symbol | Min. | Typical | Max. | Unit | Note |
| Transmitter Section | ||||||
| Centre Wavelength | λc | λc-6.5 | λc | λc+6.5 | nm | |
| Spectral Width(-20dB) | Δλ | 1 | nm | |||
| Side Mode Suppression Ratio | SMSR | 30 | dB | |||
| Average Optical Power (avg.) | Pout | -1 | +6.0 | dBm | 1 | |
| Laser Off Power | Poff | – | – | -30 | dBm | |
| Extinction Ratio | ER | 3.5 | – | – | dB | 2 |
| Relative Intensity Noise | RIN | – | – | -130 | dB/Hz | |
| Optical Return Loss Tolerance | – | – | 26 | dB | ||
| Output Optical Eye | Compliant with IEEE802.3cc eye masks when filtered | 2 | ||||
| Receiver Section | ||||||
| Receiver Center Wavelength | λc | 1260 | 1620 | nm | ||
| Receiver in Average Power | -20 | -4 | dBm | |||
| Receiver Sensitivity | Sen | -19.5 | dBm | 3 | ||
| Los Assert | LOSA | -35 | – | – | dBm | |
| Los Dessert | LOSD | – | – | -22 | dBm | |
| Los Hysteresis | LOSH | 0.5 | – | 5 | dB | |
| Overload | Pin-max | – | – | 2 | dBm | 3 |
| Receiver Reflectance | – | – | -26 | dB | ||
| Receiver Power (damage) | – | – | -3 | dBm | ||
Notes:
- The optical power is launched into 9/125µm SMF.
- Measured with a PRBS 231-1test pattern @25.78Gbps.
- Measured with a PRBS 231-1test pattern @25.78Gbps, ER=4 dB, BER <10–6.
Timing Characteristics
| Parameter | Symbol | Min. | Typical | Max. | Unit |
| TX_Disable Assert Time | t_off | 100 | us | ||
| TX_Disable Negate Time | t_on | 2 | ms | ||
| Time to Initialize | t_start_up | 300 | ms | ||
| Tx_Fault Assert | t_fault_on | 1 | ms | ||
| Tx_Fault Reset | t_reset | 10 | us | ||
| Rx_LOS Assert Delay | t_los_on | 100 | us | ||
| Rx_LOS Negate Delay | t_los_off | 100 | us | ||
| Clock Frequency | fSCL | 0 | 400 | kHz |
Ordering information
| Part Number | Product Description |
| SFP28-25G-CWDM-XX-15 | CWDM-XX, 25Gbps, 15km, Duplex LC SFP28 Transceiver, -5ºC ~ +70ºC, With DDM. |
| SFP28-25G-CWDM-XX-15E | CWDM-XX, 25Gbps, 15km, Duplex LC SFP28 Transceiver, -20ºC ~ +80ºC, With DDM. |
| SFP28-25G-CWDM-XX-15T | CWDM-XX, 25Gbps, 15km, Duplex LC SFP28 Transceiver, -40ºC ~ +85ºC, With DDM. |
| Wavelength | xx | Clasp Color Code | Wavelength | xx | Clasp Color Code |
| 1271nm | 27 | Gray | 1331nm | 33 | Green |
| 1291nm | 29 | Violet | 1351nm | 35 | Yellow |
| 1311nm | 31 | Blue | 1371nm | 37 | Orange |
