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Tapered Coupler – Polarizing or Polarization Maintaining
The Helica™ Tapered Coupler (Helica™ TC) is a fiber-based coupler for convenient and efficient coupling of light from an optical fiber into a planar waveguide device, photodiode or other non-standard high numerical aperture (NA) waveguide. A dual-core fiber design allows light from a conventional low NA fiber to be coupled into another waveguide with much smaller mode field dimensions at high coupling efficiency. The Helica™ TC allows index-matching compounds to be used between the coupler and waveguide as opposed to microlens-based coupling in which an air gap is unavoidable. The Helica™ TC is available in three basic polarization maintaining or polarizing variations:
TC-PL: Linearly polarizing tapered coupler
TC-PC: Circularly polarizing tapered coupler
TC-PM: Polarization maintaining tapered coupler
EC: Evanescent Coupler
The Helica™ TC products are endface coupled and are provided within a stainless steel tube and with a PM fiber pigtail. The Helica™ Evanescent Coupler is provided upon a frame which can be customized according to customer needs.
Standard central wavelengths provided are 1550, 1310 and 980 nm. The technology is readily scalable, and other central wavelengths as well as custom mode field diameters can be provided. A coupler chuck with standard 6.35 mm (0.25”) outer diameter, for compatibility with standard mounts, is also available.
Applications:
- Planar waveguide device coupling
- Photodiode coupling
- Laser diode coupling
- Nanostructure coupling
Specifications:
| PROPERTIES | |
| Central Wavelength1 | 980, 1310, 1550 nm |
| Mode Field Diameter2 | 0.5 x 0.8 µm; 0.7 x 1.0 µm; 0.8 x 1.2 µm |
| Bandwidth | >50 nm |
| Extinction Ratio | >25 dB |
| Typical Insertion Loss | <1 dB |
| Package Style | 460 µm stainless steel tube (19 cm long) |
| Pigtails3 | PM, 1 m, inside 900 µm furcation tube |
| Operating Temperature | -40 to +85 °C |
| Storage Temperature | -70 to +85 °C |
| 1Other wavelengths available upon request | |
| 2Slow Axis; Mode field diameters can be tailored upon request | |
| 3Connectorization available upon request | |
All information contained herein is believed to be accurate and is subject to change without notice. No responsibility is assumed for its use. Chiral Photonics, Inc., its subsidiaries and affiliates, or manufacturer, reserve the right to make changes, without notice, to product design, product components, and product manufacturing methods. Some specific combinations of options may not be available. Please contact Chiral Photonics, Inc. for additional information.
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