850nm Single Mode Dual Fiber Collimator / Fiber optic focuser

The 850nm SM Dual Fiber Collimator is the basic element for in-line fiber optics components, such as Circulators and WDM. It has low PDL, low insertion and high return loss. The unique processing and high-quality AR coating also enable this collimator to handle high power.

If you do not see a standard Fiber Collimator that meets your needs, we welcome the opportunity to review your desired specification and quote a custom Fiber Collimator. Requests for custom fiber pigtails, different wavelengths and handling power of operation or other specific needs will be readily addressed.
Single Fiber Collimator / Fiber optic focuser

Performance Specifications

Parameter	Unit	Value
Operating wavelength (λc)	nm	780,850
Operating wavelength range	nm	±50
Working Type	–	Transmission			Reflection
Working Distance	mm	5~10	11~30	31~50	0mm for G-lens,2.4mm for C-lens
Max. Insertion Loss (λc)	dB	0.30	0.40	0.50	0.30
Waist Beam Diameter	mm	~0.42
Max. PDL	dB	0.15
Min. Return Loss	dB	55
Fiber Type	–	CS780
Max. Power Handling	W	0.5, 1, 3, 5, 10
Operating temperature	℃	-5~+70
Storage temperature	℃	-40~+85
Dimension	mm	Φ3.2×10(Metal holder) or Φ2.78×9.0 (Glass tube)

The specifications are w/o connector. Other lens sizes can also be customized according to requirements.
For devices with connectors, IL will be 0.3dB higher, RL will be 5dB lower. Power transmits through the connector less than 2W.Measured at the alignment wavelength at 1/2 working distance.
Waist Beam Diameter is measured at the alignment wavelength at 1/2 working distance. The beam diameter of the finished collimator varies when used at different working distances.
When purchasing the collimator, please inform us whether it is used alone or in pairing. If paired, we will pack and ship the paired ones together.

Single Mode Dual Fiber Collimator

Package Dimension

Fiber Collimator / Fiber optic focuser

PS: The above are only typical dimensions, and the size of different working distances and spot sizes may vary.

Order information

P/N: COLL-D-②-③-④-⑤-⑥-⑦-⑧-⑨ (D: Dual fiber)

When you inquire, please provide the correct P/N number according to our ordering information and attach the appropriate description would be better. If need any connector, we do not recommend choosing a 250μm bare fiber pigtail.

①	②	③	④	⑤	⑥	⑦	⑧	⑨
Wavelength	Working Distance	Power Handling	Working Type	Lens Type	Pigtails Diameter	Fiber Length	Connectors	Dimension
78:780nm 85:850nm XX: Others	0: 0mm 5: 5mm 10:10mm	L:<0.5W 1:1W 3:3W 5:5W	T:Transmission R:Reflection	C: C-lens G: G-lens	25:250μm bare fiber 90:900μm Loose Fiber XX: Others	10:1.0m 13:1.3m 15:1.5m 20:2.0m XX: Others	00: None FP: FC/PC FA: FC/APC SA: SC/APC LA: LC/APC XX: Others	3.2×10 2.78×9

Part Number Example: COLL-D-85-5-L-T-C-25-10-00-2.78X9

Description: 850nm SM Dual Fiber Collimator, 5mm working distance ,0.5W hand power, Transmission type, C lens, CS780 sm fiber, bare fiber, 1.0m fiber length, and no connector, package dimension:2.78x9mm. Used in pairing

Ordering Information for Custom Parts:

If you need to customize other specifications, please provide detailed description for your requirement.

Some reminders about collimators

2000nm Polarization Maintaining Single Fiber Collimator

1.Definition of working distance:
If used for pairing, it is the distance between two lenses.
If used alone, it is twice the distance between the lens and the target object.

2. Waist Beam Diameter: Ideally, it mostly refers to the spot diameter at the waist position (1/2 working distance).

3.Once the C-lens collimator is produced, the waist position has already been fixed, so measuring the spot diameter at different positions will have different values waist beam diameter. So the C-lens collimator cannot be considered a true collimator, it can only be considered a type of focusing device. Some parameters of the collimator, such as divergence angle, focal length, etc., are not applicable to C-lens collimators. When we make conventional collimators, we only consider the working distance, and the spot diameter is generally less than 0.5mm, unless we design C-lenses separately.

4.Back Focal Length: The distance between the lens and the end-cap(glass ferrule). By changing the back focal length of C-lens, the position of the waist can be adjusted within a certain range, resulting in different working distances.

back focal length

Product

Fiber Optical Collimator

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