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ROSA Receiver Optical Subassembly

ROSA Optical Subassembly (Receiver Optical Subassembly), mainly composed of detectors and adapters, in high data rate optical fiber modules, usually PIN or ADP photodiode and TIA assembled in a sealed metal housing, The optical receiving component is mainly used to convert optical signals to electrical signals (O/E conversion), where the ROSA lens component usually encapsulates a microlens in a coaxial metal shell. Microlens using high temperature molding, the advantages are low production cost, high precision, suitable for aspherical microlens mass production. ROSA lens assembly is one of the core components of a variety of optical systems, mainly used to convert optical signals into electrical signals (O/E conversion).

receiver optical subassembly
receiver optical sub assembly

Specifications of ROSA


ROSA 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 ROSA

Dimension Drawing of ROSA

Features of ROSA

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

  • Material: Use a variety of high and low refractive index optical glass and metal material coaxial shell

  • ROSA lens component performance: Solar Valley strictly matches the diameter and center thickness of ROSA lens components to ensure package quality and high precision required center thickness. Tianggu uses various packaging technologies such as UV curing, gluing, high-temperature powder curing and so on in different glass and metal coaxial housings to precisely control the focal length and various optical properties of ROSA lens components.

  • Product size indicator description:

    Maximum dimension of ROSA lens assembly: OD≤φ20mm

    ROSA lens assemblies can achieve the following accuracy levels according to customer requirements:

    Ultra-high precision: surface shape error < 0.1μm, surface roughness < 0.01μm

    High precision grade: Surface error < 0.5μm, surface roughness < 0.05μm Precision grade: Surface error < 1μm, surface roughness < 0.1μm


  • Surface defect grade: 60-40, 40-20, 20-10, 10-5 According to customer requirements.

  • Coating: Coating according to customer requirements.

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