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Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

2026-07-16

1. CATV Triple-Play Fiber Transmission System

Gezhi Photonics PMFWDM series 1550/980 and 1550/1480 models fit fiber optic broadcast architecture, transmitting 1550nm CATV signal at pass port and reflecting 980/1480nm pump light for wavelength combination, enabling triple-play service transmission over single fiber.

Quantified performance matching criteria:

Pass port insertion loss ≤0.7~0.8dB, channel ripple ≤0.4dB to stabilize signal fluctuation in long-distance transmission;
23℃ return loss ≥50dB, pass isolation at reflect wavelength ≥30dB to eliminate crosstalk between pump light and video signal;
Operating temperature range -5℃~+70℃, suitable for long-term deployment in outdoor optical cabinets and overhead fiber cables.

Optical path rule: Pump light enters common Com port via Ref port, CATV signal outputs from Com to Pass port. Full PM fiber design maintains stable polarization and reduces polarization-dependent loss affecting HD video quality.

2. Internal Pump-Signal Splitting for CWDM/DWDM Optical Modules

For erbium-doped amplification circuits inside dense WDM modules, 1550/980 and 1550/1480 PM filter WDM realize pump coupling and signal demultiplexing.

Table 1 Key Performance Parameters for Communication Band PMFWDM

Parameter	1550/980	1550/1480	Unit
Pass Insertion Loss	≤0.7	≤0.8	dB
Reflect Insertion Loss	≤0.6	≤0.6	dB
Isolation @Reflect Wavelength	≥30	≥30	dB
Pass Port Extinction Ratio	≥20	≥20	dB
Wavelength Thermal Drift	≤0.003	≤0.003	nm/℃

Quantifiable parameters ensuring stable operation:

Wavelength thermal stability ≤0.003nm/℃, insertion loss thermal stability ≤0.005dB/℃ to minimize wavelength shift under variable room temperature;
Pass port extinction ratio ≥20dB, reflect port extinction ratio ≥18dB, full PM pigtails without breaking module polarization circuit;
Max CW power handling 500mW, compatible with pump power range of standard EDFA modules.

Standard package dimension 5.5×35mm for compact integration inside high-density multi-channel modules, with customizable forward (F) / backward (B) pump path.

3. EPON/GPON Passive Optical Access Networks

FTTH PON networks with optical amplification require co-transmission of 1550nm CATV signal and 980/1480nm pump light. PM filter WDM acts as core passive component for physical wavelength separation.

Key selection indicators:

Reflect wavelength isolation ≥30dB to block pump leakage interfering with uplink/downlink data;
Test baseline defined without connectors; each additional connector brings only 0.3dB extra loss, convenient for system link budget calculation;
Max tensile load ≤5N for pigtail fiber, compliant with wiring and plugging standards to avoid fiber breakage.

4. Industrial PM Fiber Lasers & Fiber Amplifiers

1064/980 and 1550/1064 dual-band models serve Yb-doped and Er-doped PM fiber laser systems, reflecting 980nm pump light and transmitting 1064/1550nm signal light unidirectionally, indispensable for MOPA oscillation-amplification optical paths.

Table 2 Operating Condition Parameters for Laser Band PMFWDM

Parameter	Spec Value	Application Value
Storage Temp.	-40~+85℃	Laser aging test & warehouse storage
Pump Isolation	≥30dB	Prevent pump back-reflection, protect laser diode
Polarization Mode	Slow Axis / Dual Axis Optional	Match linear polarization laser output
Max CW Power	500mW CW	Industrial continuous fiber amplification

Reliability parameters for industrial laser scenarios:

Storage temperature range -40℃~+85℃, matching laser warehouse storage and high-low temperature aging test procedures;
High isolation ≥30dB prevents pump back-reflection to protect pump diodes;
Optional slow-axis-only or dual-axis working modes to match linear polarization laser design.

5. 2μm Mid-Infrared Optical Sensing & Precision Coherent Detection

2000/1550 long-waveband PM filter WDM targets distributed acoustic sensing, fiber optic gyroscopes and coherent precision measurement systems, separating 1550nm reference light and 1950~2050nm detection signal light.

Specialized performance specifications:

Pass isolation ≥25dB, reflect isolation ≥12dB for noise suppression in weak mid-infrared signal detection;
Continuous PM fiber optical path to preserve polarization purity and guarantee coherent measurement accuracy;
Low insertion loss and low thermal drift support long-term stable operation of long-distance pipeline DAS and inertial navigation fiber gyros.

6.Universal Customization for Differentiated Demands Across All Scenarios

All models support customized configuration to adapt to special optical path designs:

Adjustable wavelength combinations, pump transmission directions and polarization working axes;
Independent PM fiber selection for Com port and Ref port: PM980, PM1550, Hi1060, SMF-28E and custom fiber types;
Bare fiber / 900μm loose tube pigtails, FC/SC APC/UPC connectors and variable fiber lengths on demand;

7.Industry Selection Summary

The core advantage of PM filter WDM lies in simultaneous wavelength splitting and polarization maintenance, distinguishing it from standard single-mode WDM. Supported by quantifiable low insertion loss, high isolation, wide temperature tolerance and thermal stability parameters, it fully covers five major sectors: CATV PON, WDM optical modules, fiber lasers and mid-infrared precision sensing. Standardized ordering codes enable rapid matching with optical path designs for diverse application scenarios.

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Home Blog

Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

1. CATV Triple-Play Fiber Transmission System

Quantified performance matching criteria:

Pass port insertion loss ≤0.7~0.8dB, channel ripple ≤0.4dB to stabilize signal fluctuation in long-distance transmission;
23℃ return loss ≥50dB, pass isolation at reflect wavelength ≥30dB to eliminate crosstalk between pump light and video signal;
Operating temperature range -5℃~+70℃, suitable for long-term deployment in outdoor optical cabinets and overhead fiber cables.

2. Internal Pump-Signal Splitting for CWDM/DWDM Optical Modules

For erbium-doped amplification circuits inside dense WDM modules, 1550/980 and 1550/1480 PM filter WDM realize pump coupling and signal demultiplexing.

Table 1 Key Performance Parameters for Communication Band PMFWDM

Parameter	1550/980	1550/1480	Unit
Pass Insertion Loss	≤0.7	≤0.8	dB
Reflect Insertion Loss	≤0.6	≤0.6	dB
Isolation @Reflect Wavelength	≥30	≥30	dB
Pass Port Extinction Ratio	≥20	≥20	dB
Wavelength Thermal Drift	≤0.003	≤0.003	nm/℃

Quantifiable parameters ensuring stable operation:

Wavelength thermal stability ≤0.003nm/℃, insertion loss thermal stability ≤0.005dB/℃ to minimize wavelength shift under variable room temperature;
Pass port extinction ratio ≥20dB, reflect port extinction ratio ≥18dB, full PM pigtails without breaking module polarization circuit;
Max CW power handling 500mW, compatible with pump power range of standard EDFA modules.

Standard package dimension 5.5×35mm for compact integration inside high-density multi-channel modules, with customizable forward (F) / backward (B) pump path.

3. EPON/GPON Passive Optical Access Networks

FTTH PON networks with optical amplification require co-transmission of 1550nm CATV signal and 980/1480nm pump light. PM filter WDM acts as core passive component for physical wavelength separation.

Key selection indicators:

Reflect wavelength isolation ≥30dB to block pump leakage interfering with uplink/downlink data;
Test baseline defined without connectors; each additional connector brings only 0.3dB extra loss, convenient for system link budget calculation;
Max tensile load ≤5N for pigtail fiber, compliant with wiring and plugging standards to avoid fiber breakage.

4. Industrial PM Fiber Lasers & Fiber Amplifiers

Table 2 Operating Condition Parameters for Laser Band PMFWDM

Parameter	Spec Value	Application Value
Storage Temp.	-40~+85℃	Laser aging test & warehouse storage
Pump Isolation	≥30dB	Prevent pump back-reflection, protect laser diode
Polarization Mode	Slow Axis / Dual Axis Optional	Match linear polarization laser output
Max CW Power	500mW CW	Industrial continuous fiber amplification

Reliability parameters for industrial laser scenarios:

Storage temperature range -40℃~+85℃, matching laser warehouse storage and high-low temperature aging test procedures;
High isolation ≥30dB prevents pump back-reflection to protect pump diodes;
Optional slow-axis-only or dual-axis working modes to match linear polarization laser design.

5. 2μm Mid-Infrared Optical Sensing & Precision Coherent Detection

Specialized performance specifications:

Pass isolation ≥25dB, reflect isolation ≥12dB for noise suppression in weak mid-infrared signal detection;
Continuous PM fiber optical path to preserve polarization purity and guarantee coherent measurement accuracy;
Low insertion loss and low thermal drift support long-term stable operation of long-distance pipeline DAS and inertial navigation fiber gyros.

6.Universal Customization for Differentiated Demands Across All Scenarios

All models support customized configuration to adapt to special optical path designs:

Adjustable wavelength combinations, pump transmission directions and polarization working axes;
Independent PM fiber selection for Com port and Ref port: PM980, PM1550, Hi1060, SMF-28E and custom fiber types;
Bare fiber / 900μm loose tube pigtails, FC/SC APC/UPC connectors and variable fiber lengths on demand;

CWDM Mux Demux

DWDM Mux Demux

AAWG DWDM

Filter WDM

Compact CWDM Module

Optical Add Drop Multiplexer

Fiber Optical Switches

Optical Switch Equipment

MEMS Optical Switch

Polarization Maintaining Components

High Power Components

Fiber Optic Passive Components

Patch Cable Series

Fiber Optic Box

Optical Transceiver Module

Fiber Optic Accessories

CWDM Mux Demux

DWDM Mux Demux

AAWG DWDM

Filter WDM

Compact CWDM Module

Optical Add Drop Multiplexer

Fiber Optical Switches

Optical Switch Equipment

MEMS Optical Switch

Polarization Maintaining Components

High Power Components

Fiber Optic Passive Components

Patch Cable Series

Fiber Optic Box

Optical Transceiver Module

Fiber Optic Accessories

Blog Details

Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

1. CATV Triple-Play Fiber Transmission System

2. Internal Pump-Signal Splitting for CWDM/DWDM Optical Modules

Table 1 Key Performance Parameters for Communication Band PMFWDM

3. EPON/GPON Passive Optical Access Networks

5. 2μm Mid-Infrared Optical Sensing & Precision Coherent Detection

6.Universal Customization for Differentiated Demands Across All Scenarios

7.Industry Selection Summary

Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

Multi-Band PM Filter WDM Delivers Full Optical Path Solutions, Analysis of Five Standardized Application Scenarios

1. CATV Triple-Play Fiber Transmission System

2. Internal Pump-Signal Splitting for CWDM/DWDM Optical Modules

Table 1 Key Performance Parameters for Communication Band PMFWDM

3. EPON/GPON Passive Optical Access Networks

5. 2μm Mid-Infrared Optical Sensing & Precision Coherent Detection

6.Universal Customization for Differentiated Demands Across All Scenarios

7.Industry Selection Summary