1.25G Duplex 1×9 Optical Transceiver Module is a full-duplex Gigabit fiber transceiver in the compact 1×9 pin-package format, designed for high-performance industrial and telecom fiber optic deployments. Unlike BiDi (bidirectional) modules that use WDM technology on a single fiber, this Duplex module uses two separate fiber strands — one for transmit (TX) and one for receive (RX) — following the conventional duplex fiber topology used in standard Gigabit Ethernet and Fiber Channel equipment.

The module offers the broadest wavelength coverage in the 1×9 product family: 850nm and 1310nm for multimode fiber applications up to 2km, and 1310nm, 1490nm, and 1550nm for single-mode fiber distances from 20km to 120km. With metal SC, FC, and ST optical interfaces and selectable +3.3V or +5.0V power supply, it provides maximum flexibility for integration into industrial PCB designs and existing fiber plant infrastructures.

The LVPECL/LVTTL logic interface ensures direct compatibility with mainstream digital signal processing circuits. Temperature grades cover standard commercial use (0°C to +70°C) and full industrial deployment (–40°C to +85°C), making it suitable for data centers, telecom base stations, and industrial control fiber infrastructure.

Technical Specs Summary

Key Features

1.25Gbps full-duplex — standard two-fiber duplex topology (TX + RX)

Quad-band wavelength coverage: 850nm / 1310nm / 1490nm / 1550nm

1×9 pin package — compact direct PCB-mount format

Metal SC / FC / ST optical interfaces (three options)

Multimode 50/125μm fiber: 500m (850nm) and 2km (1310nm)

Single-mode 9/125μm fiber: 20km to 120km

Power supply: +3.3V or +5.0V selectable

Logic: LVPECL  |  LVTTL signal detect output

Standard temperature: 0°C to +70°C

Industrial temperature: –40°C to +85°C

Applications: Fast Ethernet / Fiber Channel / 1000BASE-LX/SX

Technical Advantages

Quad-Band Wavelength Coverage — One Product Series, All Scenarios

With four wavelengths covering both multimode (850nm, 1310nm) and single-mode (1310nm, 1490nm, 1550nm) fiber, this 1×9 Duplex series handles the full spectrum of Gigabit fiber deployment scenarios — from short-reach 500m data center patch links to 120km metropolitan backbone spans — within a single qualified product family. This simplifies procurement, stocking, and engineering qualification for OEM equipment manufacturers.

Duplex Two-Fiber Topology — Universal Compatibility

Using conventional TX + RX duplex fiber — the standard topology for all Gigabit Ethernet and Fiber Channel equipment — this module is directly compatible with standard duplex patch cords, duplex LC/SC/FC/ST adapters, and existing two-fiber plant infrastructure without wavelength pairing requirements. This contrasts with BiDi modules, which require matched complementary wavelength pairs at each link end.

Metal SC/FC/ST Interfaces — Broad Connectivity

Three metal optical interface options — SC, FC, and ST — cover the most common fiber connector types found in industrial Ethernet, Fiber Channel, and telecom access equipment. Metal housings provide greater mechanical durability than plastic connectors under repeated mating cycles and vibration, which is important in industrial PCB equipment subject to regular maintenance.

120km Single-Mode Reach at 1.25Gbps

The 1550nm models achieve up to 120km over 9/125μm single-mode fiber — sufficient for metropolitan ring networks, inter-city backbone links, and remote site connectivity at full Gigabit speeds. The 1490nm 100km variant covers demanding metropolitan backhaul links where 80km models fall just short of the required span.

Selectable 3.3V / 5.0V Power Supply

Selectable +3.3V or +5.0V single power supply eliminates voltage regulation circuitry when integrating the module into either modern low-voltage or legacy 5V PCB designs. This is a practical advantage for OEM equipment manufacturers maintaining product lines across multiple hardware generations.

Wavelength and Fiber Coverage Reference

Select the wavelength and fiber variant based on your link distance and fiber plant type.

Typical Applications

Gigabit Ethernet (1000BASE-SX/LX) access and backbone fiber links

Fiber Channel SAN storage network duplex fiber connectivity

Short-reach multimode data center and campus inter-rack connections

Metropolitan area network (MAN) duplex fiber ring segments

Long-distance single-mode backbone fiber links up to 120km

Telecom base station and access equipment fiber interconnects

Industrial Gigabit Ethernet equipment OEM PCB fiber integration

Fiber infrastructure using standard duplex SC/FC/ST patch cords

Compatibility and Deployment

The 1×9 module mounts directly on the host PCB via through-hole pins, compatible with standard 1×9 PCB footprints. Metal SC, FC, and ST interfaces accept standard duplex fiber patch cords in the corresponding connector format. The LVPECL differential output is compatible with standard SERDES and FPGA fiber front-end inputs.

Part number codes: (1) power supply voltage; (2) temperature grade; (3) interface type. See Notes below the ordering table for full decode rules. Contact our technical team for non-standard fiber lengths, custom wavelength configurations, or OEM volume support.

FAQ Module

Q: What is the difference between Duplex and BiDi 1×9 optical transceivers?

A: A Duplex 1×9 module uses two separate fibers — one for TX, one for RX — following standard duplex fiber topology. A BiDi 1×9 uses WDM technology to transmit and receive on a single fiber strand using different wavelengths. The Duplex module works with any standard duplex fiber patch cord and does not require wavelength-matched module pairs at each link end.

Q: What fiber types and distances does this module support?

A: The module covers four wavelengths: 850nm (multimode 500m), 1310nm (multimode 2km and single-mode 20–60km), 1490nm (single-mode 60–100km), and 1550nm (single-mode 60–120km). This covers short-reach LAN links through long-haul 120km metropolitan backbone spans within a single product series.

Q: What is the maximum transmission distance?

A: Up to 120km over 9/125μm single-mode fiber using the 1550nm models (GACx-1512-K2x). Other maximum distances: 1490nm = 100km; 1310nm SMF = 60km; 1310nm MMF = 2km; 850nm MMF = 500m. Select based on your fiber type and required link span.

Q: Why choose this Duplex 1×9 instead of the BiDi 1×9?

A: Choose the Duplex 1×9 when: (1) Your equipment uses standard duplex fiber infrastructure with TX and RX on separate fibers. (2) You need multimode fiber support (BiDi modules are typically single-mode only). (3) You want to avoid the wavelength pairing complexity of BiDi modules. Choose BiDi 1×9 when fiber count reduction is the priority and single-fiber links are acceptable.

Q: What power supply voltages are supported?

A: Both +3.3V and +5.0V single power supplies are supported, selectable via the part number code (x=N for 3.3V; x=L for 5.0V). This dual-voltage support covers both modern low-voltage and legacy 5V PCB designs without additional voltage regulators.

Q: What temperature grades are available?

A: Standard C (0°C to +70°C) for controlled indoor environments such as data centers and equipment rooms. Industrial I (–40°C to +85°C) for outdoor cabinets, industrial floors, rail trackside, and other environments with wide temperature variation. Specify via the part number at order time

Ordering Information

13 models. Part number codes: (1)=power supply, (2)=temperature grade, (3)=interface type. See notes below table.

Note 1:  (1) x=N → Power Supply 3.3V;  x=L → Power Supply 5.0V.

Note 2:  (2) x=space → Standard C (0°C to +70°C);  x=I → Industrial I (–40°C to +85°C).

Note 3:  (3) Interface: SC = 'F' (e.g. GACx-1312-02xF);  FC = 'T' (e.g. GACx-1312-02xT);  ST = '1' (e.g. GACx-1312-02x1).

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