Fibre Optic Components

Pigtailed Optical Sub-Assembly (OSA)

Coretek Pigtailed Optical Sub-Assemblies (OSA) are high-performance optical components designed for use in digital communications and optical systems. As a leading manufacturer of pigtailed OSAs, Coretek combines lasers, photodiodes, or hybrid optical components with precision-aligned fiber pigtails for flexible integration on PCBs or into custom assemblies. These pigtailed OSAs support a wide range of fiber types including single-mode, high-bandwidth multimode, and specialty fibers, and can be supplied with standard connector options such as LC, SC, FC, ST, SMA, or custom connectors based on application needs. Pigtailed OSAs provide improved electrical performance characteristics while enabling installation flexibility and reduced reliance on patch cords and adapters, making them ideal for telecommunications, broadband access, instrumentation, and industrial systems. Coretek’s experience in optical component manufacturing ensures reliability and quality for demanding environments. 

Bi-Directional Optical Sub-Assembly (BOSA)

Coretek BOSA (Bi-Directional Optical Sub-Assembly) components integrate both transmitter and receiver optical paths into a single compact module, enabling full-duplex communication over a single fiber strand. A BOSA combines the functionality of a TOSA and ROSA plus wavelength division techniques such as WDM filters to separate transmit and receive signals at different wavelengths. This integration reduces fiber infrastructure costs and simplifies network deployment, especially in bi-directional access networks, PON/FTTH applications, and point-to-point communication links where fiber is limited or where simplified cabling is important. Coretek’s BOSA products are manufactured to support digital communications systems with reliable optical performance and consistent alignment for high-speed data transmission. 

Receiver Optical Sub-Assembly (ROSA)

Coretek’s Receiver Optical Sub-Assemblies (ROSA) are precision optical components that convert incoming optical signals into electrical signals for downstream processing. At the heart of each ROSA is a photodiode and associated amplifier circuitry, engineered to deliver high sensitivity and low noise performance. ROSAs are designed to meet the demands of modern digital communication systems where accurate optical reception is critical, including high-speed data links, telecom interfaces, and custom optical equipment. These receiver assemblies can be integrated directly into larger modules or used as standalone components in custom optical designs. Coretek’s ROSA products are manufactured in Taiwan with a focus on optical alignment precision, reliability, and consistent signal integrity across demanding operating environments. 

Transmitter Optical Sub-Assembly (TOSA)

Coretek Transmitter Optical Sub-Assemblies (TOSA) are high-quality optical transmitter components that convert electrical signals into optical signals for transmission over fiber. Coretek TOSAs are available with a range of laser diode technologies including Fabry-Perot (FP), Distributed Feedback (DFB), VCSEL, and CWDM variants, enabling support for data rates from low-speed links up to multi-gigabit optical communication systems. Typical packaging includes hermetically sealed TO-can assemblies as well as receptacle packaging with LC, SC, ST, and FC options. Flexible configurations such as dual, triple, or quad laser arrangements are available for customized multi-channel designs. TOSAs are optimized for reliable optical output and stability across temperature ranges, making them suitable for telecom, data communications, industrial networks, and custom OEM applications. 

Why These Fiber Optic Components Matter

Coretek’s OSA, BOSA, ROSA, and TOSA products are the foundational building blocks used inside optical transceivers and custom optical assemblies. Each component plays a key role in electro-optical conversion:

• TOSA generates optical signals from electrical inputs.

• ROSA captures optical signals and converts them back into electrical data.

• BOSA combines both transmit and receive functions for single-fiber bidirectional communication.

• OSA components provide flexibility in system design by combining optical sources and detectors with optimized fiber interfaces.

Together, these components support a wide range of applications in telecommunications, broadband access, industrial automation, data communications, and custom optical systems. They are manufactured with precision and quality controls in Taiwan to support performance, reliability, and long-term availability.