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BOSA Bidirectional Optical Subassembly

BOSA optical transmitting and receiving assembly (Bi-Directional Optical Sub-Assembly) refers to a single-fiber bidirectional optical device, mainly composed of a transmitting laser, a receiving detector, an adapter, a filter, a base, an isolator and a die sleeve, or TOSA and ROSA integrate the transceiver of the light source (LD and PIN/APD) through the coaxial coupling process, plus components such as splitters and optical fibers. The main function is to convert electrical signals and optical signals into each other. The BOSA lens assembly usually encapsulates a micro lens in a coaxial metal housing. Microlenses are molded using high-temperature molding, which has the advantages of low production cost and high precision, and is suitable for mass production of aspherical microlenses. BOSA lens assembly is one of the core components of various optical systems. It is mainly used for transmitting coupling and receiving coupling, and converting electrical signals and optical signals to each other.

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Specifications of BOSA


BOSA lens assembly parameter table
projectIndicator requirements
1. MaterialUse various high and low refractive index optical glass and stainless steel, SF20F and other metal housings
2. Outer diameterRound OD≤20mm
3. Thicknessaccording to customers needs
4. Effective focal lengthaccording to customers needs
5. Working distanceaccording to customers needs
6. Design wavelengthaccording to customers needs
8. CoatingAR anti-reflection coating R<0.5% @λnm according to customer requirements
9. Eccentricityaccording to customers needs
10. Effective apertureED>90% aspheric area
11. Surface shapeUltra-high precision Rt≤0.1μm, high precision Rt≤0.5μm, precision Rt≤1μm
12. Surface quality60-40, 40-20, 20-10, 10-5


Dimension Drawing of BOSA

Dimension Drawing of BOSA

Features of BOSA

Features of BOSA
  • One-stop customized production: Solar Valley processes BOSA lens components of various sizes and structures according to customer requirements. The optical surface of the lens can be spherical or aspherical.

  • Material: Use various high and low refractive index optical glass and metal coaxial shells.

  • BOSA lens component properties: Solar Valley strictly matches the diameter and center thickness of the BOSA lens component to ensure packaging quality and the center thickness required for high precision. Tianyanggu uses various packaging technologies such as ultraviolet curing, gluing, high-temperature powder curing and other packaging technologies in coaxial shells made of different glass materials and metal materials to accurately control the focal length of the BOSA lens assembly and achieve better transmitting and receiving coupling performance.

  • Description of product size indicators: Maximum outer dimension of BOSA lens assembly: OD≤φ20mm. BOSA lens assembly can achieve the following accuracy levels according to customer requirements: Ultra-high precision level: surface shape error <0.1μm, surface roughness <0.01μm. High-precision level: Surface error <0.5μm, surface roughness <0.05μm Precision grade: surface error <1μm, surface roughness <0.1μm

  • Surface defect level: 60-40, 40-20, 20-10, 10-5 according to Customers require production.

  • Coating: Coating according to customer requirements.

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