NeoPhotonics PT7320-31-1W 155M 1310nm 15km SFP

The NeoPhotonics PT7320-31-1W is a hot-pluggable SFP optical transceiver module designed for 155 Mbps STM-1/OC-3 SONET/SDH and related low-rate applications. It operates at a nominal wavelength of 1310 nm using a Fabry-Perot (FP) or MQW FP laser transmitter and a PIN photodiode receiver. The module supports reliable transmission distances up to 15 km over single-mode fiber (ITU-T G.652) and complies with the SFP Multi-Source Agreement (MSA), SFF-8472 digital diagnostic specifications, and ITU-T G.957 S-1.1 application code for STM-1/OC-3 interfaces.This transceiver is optimized for data rates from 0.125 Gb/s to 0.155 Gb/s (155.52 Mbps STM-1/OC-3 line rate with NRZ encoding) and is also suitable for other 100–155 Mbps applications. It features duplex LC optical connectors and is intended for use with single-mode fiber (SMF). The electrical interface consists of a 20-pin SFP connector with differential CML signals. The module operates from a single +3.3 V power supply with low power dissipation, typically below 1 W.
Digital diagnostic monitoring (DDM/DOM) functions are implemented via the two-wire I2C serial interface. This enables real-time monitoring and reporting of critical parameters including transmitted optical power, received optical power, laser bias current, supply voltage, and module temperature. Programmable warning and alarm thresholds support proactive fault detection and performance management. Additional features include transmitter disable (TX_DISABLE) and loss-of-signal (LOS) indication.
Optical performance specifications include average transmitter output power typically from -15 dBm to -8 dBm and receiver sensitivity of -28 dBm or better, providing a sufficient link budget for 15 km reach on single-mode fiber. The design meets relevant standards for jitter tolerance, extinction ratio, and eye mask compliance. The PT7320-31-1W is classified as a Class 1 laser product and complies with RoHS and EMC requirements.
The transceiver is compatible with a wide range of SFP-enabled platforms supporting 155 Mbps interfaces, including SDH/SONET multiplexers, optical transmission equipment, routers, and switches used in access networks, FTTx deployments, and metro applications. It is particularly suited for STM-1/OC-3 point-to-point links requiring 15 km single-mode fiber reach.
Installation is simplified by the hot-pluggable SFP form factor, allowing insertion or removal without powering down the host equipment. The module supports commercial operating temperatures from 0°C to +70°C and requires minimal airflow for thermal management. Proper cleaning and inspection of the duplex LC connectors are essential to prevent contamination and maintain optimal link performance.
During operation, the PT7320-31-1W provides calibrated digital diagnostic data for accurate reporting and integrates seamlessly with host management systems through standard SNMP or CLI interfaces. Recommended fiber patch cables are duplex single-mode LC-to-LC with low insertion loss. The module ensures reliable performance in carrier-grade and enterprise environments while maintaining full MSA compliance.