Coupler Filter-type Couplers

KernsTech’s Filter-type PM Couplers are precision passive optical components used for splitting or combining polarized light in fiber systems. These devices are widely applied in EDFA, Raman amplifiers, fiber sensing, testing equipment, and high-power laser systems.

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Product Description

The Coupler Filter type Couplers are advanced optical components that integrate wavelength filtering and power splitting functionalities in a single module. Designed for applications requiring both precise wavelength selection and efficient power distribution, these couplers utilize thin-film filte

r (TFF) or arrayed waveguide gratings (AWG) to separate or combine specific wavelength bands while maintaining low insertion loss. Available in configurations such as 1x2, 2x2, and 1xN, they support wavelength ranges from 850 nm to 1650 nm, including telecom (1310/1550 nm), datacom (850/1300 nm), and specialty bands (980/1480 nm). The coupler features a compact housing with hermetic sealing, ensuring stable performance in high-temperature and high-vibration environments.

Featuress

Dual-Function Design: Combines wavelength filtering (isolation ≥30 dB) and power coupling (uniformity ≤±0.5 dB) for integrated signal management.

Wide Wavelength Coverage: Supports CWDM (1270–1610 nm), DWDM (1525–1565 nm), and custom wavelength pairs (e.g., 980/1550 nm pump-signal combining).

Low Loss Performance: Insertion loss ≤0.8 dB (filter port) and ≤0.3 dB (coupling port), with return loss ≥55 dB to minimize reflections.

High Channel Isolation: Adjacent channel isolation ≥25 dB for DWDM models, ensuring minimal crosstalk between wavelength channels.

Flexible Configuration: Available with FC/APC, SC/APC, or LC connectors, and customizable splitting ratios (50:50, 80:20, etc.) for specific system needs.

Applications

WDM Networks: Integrates filtering and power splitting in passive optical networks (PONs) and dense wavelength-division multiplexing systems.

Fiber Laser Systems: Combines pump light (980 nm) with signal light (1550 nm) while filtering out unwanted wavelengths in EDFA setups.

Optical Sensing: Separates measurement signals from reference wavelengths in distributed temperature sensing (DTS) and fiber Bragg grating (FBG) networks.

Data Centers: Enables high-density wavelength routing in 400G/800G optical transceivers for efficient bandwidth utilization.

Medical Devices: Filters and splits light in endoscopic imaging systems to enhance resolution in multi-spectral applications.

Faq

Q: What is the difference between a filter coupler and a standard coupler?

A: Filter couplers include wavelength-selective elements, allowing only specific bands to pass through designated ports, while standard couplers split power without wavelength filtering.

Q: Can it handle high-power laser inputs?

A: Yes, high-power versions support up to 1 W CW for pump wavelengths (e.g., 980 nm) with thermal management enhancements.

Q: How is channel isolation tested?

A: Using a broadband light source and optical spectrum analyzer, measuring the power leakage between adjacent wavelength channels.

Q: Does it support bidirectional wavelength transmission?

A: Yes, designed for bidirectional use in full-duplex communication systems with proper wavelength assignment.

Q: What is the typical lead time for custom wavelength configurations?

A: 10–14 business days for non-standard wavelength pairs or unique splitting ratios.

Product Type	Wavelength Range	Features	Applications
PM Coupler 1x2 / 2x2	780–1550nm	Low IL, High Return Loss, High ER, Stable & Reliable	EDFA / Raman Amplifiers, Fiber Sensing, Test Equipment
High Power PM Coupler (Up to 20W)	780–2050nm (±10 to ±40nm)	Available in 1x2/2x2 types with high handling power	High Power Laser Systems, Industrial Fiber Optics
Coupler Module (1x4, 1x8, 1x16)	850–1550nm	Multi-channel splitter module, customizable packages	Power Monitoring, Multi-channel Signal Distribution

Ordering Code Format

Format	Example	Description
KHPMFC-Wavelength-Type-Split-Power-Fiber-Conn	KHPMFC-1550-1x2-50/50-0.5W-PM250-FC/APC	1550nm, 1x2 coupler, 50/50, 0.5W, PM250 fiber, FC/APC

Explanation of Fields

Wavelength: Operating center wavelength (e.g. 1550, 980, 1064)
Type: 1x2, 2x2, 1x4, 1x8, 3x3, etc.
Split Ratio: 50/50, 10/90, 33/33/33, or custom
Power: Maximum handling power (e.g. 0.5W, 10W, 20W)
Fiber: PM250, PM900, bare fiber, etc.
Connector: FC/APC, FC/UPC, SC/PC, or none

Coupler Model Summary (Pages 31–36)

Model Code	Wavelength	Type	Split Ratio	IL (dB)	ER (dB)	Power	Package (mm)
KHPMFC-1550-1x2	980–1550nm	1x2	50/50	≤0.8	≥20	0.5W	φ5.5×35 or custom
KHPMFC-1064-2x2	980–1550nm	2x2	10/90	≤1.0	≥20	0.5W	φ5.5×35
KHPMTC-850-1x2	780–1050nm	1x2	50/50 (Tapered)	≤1.0	≥18	0.5W	φ5.5×35
KHPMTC-1064-3x3	780–1550nm	3x3	33/33/33 ±4%	≤1.2	≥18	2W	φ3×54 / φ4×70
KHPMHPC-1550-1x2	1550±40nm	1x2	50/50 (High PWR)	≤0.7	≥22	10–20W	φ5.5×35 / 70×12×8
KHPMMC-850-1x4	850–1550nm	1x4	Even Split	≤8.0	≥18	0.5W	ABS 100×80×10
KHPMMC-1310-1x8	850–1550nm	1x8	Even Split	≤12.0	≥18	0.5W	ABS 120×80×10
KHPMMC-1550-1x16	850–1550nm	1x16	Even Split	≤16.5	≥18	0.5W	AL 140×140×10