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Description

The Manually Adjustable Polarization Insensitive Variable Bandwidth Tunable Filter is a highly versatile optical component designed for precise control over both the center wavelength and bandwidth of optical signals. Engineered for demanding applications in fiber optic communications, research, and manufacturing, this filter stands out for its ability to independently tune both wavelength and bandwidth, making it an essential tool for WDM channel filtering, signal processing, and spectral analysis.

At the heart of this tunable filter are two multi-layer thin film bandpass filters arranged in series. Each filter can be independently adjusted, allowing users to fine-tune the overlap between their passbands. This unique configuration enables continuous adjustment of the filter bandwidth from 1 nm to 18 nm, as well as a tunable wavelength range of up to 45 nm within the 1100 nm to 1650 nm spectrum. The result is a flat-top filter profile with steep roll-off, ensuring high resolution and excellent out-of-band suppression—critical for applications such as laser pulse shaping, ASE noise suppression, and high-speed transmission testing.

A key advantage of this filter is its polarization insensitivity. Utilizing advanced techniques to minimize polarization dependent loss (PDL), the device achieves PDL values below 0.3 dB, making it suitable for modern DWDM systems and other polarization-sensitive environments. The filter is available in singlemode, polarization maintaining (PM), and multimode fiber configurations, with PM versions typically constructed using PANDA fiber structures for optimal performance. This flexibility allows seamless integration into a wide range of fiber optic setups, including custom builds with customer-supplied fibers.

Designed for both laboratory and industrial environments, the manually adjustable tunable filter features robust construction and high input power handling. Its intuitive adjustment knobs provide precise manual control, making it ideal for quality control, product development, and component manufacturing. Whether used for filtering specific WDM channels, shaping laser pulses, or conducting spectral measurements, this tunable filter delivers reliable, high-performance operation for advanced photonics applications.

Manually Adjustable Polarization Insensitive Variable Bandwidth Tunable Filter BTF-11-11-1525

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Specifications

Operating Wavelength Range: 1525 – 1565 nm
Insertion Loss: 3 dB
Input Power: 200 mW
Bandwidth (FWHM): 1-18 nm
Wavelength Resolution: 0.1 nm
Filter Edge Roll Off Slope: 10 dB/nm
Polarization Dependent Loss (PDL): Typically less than 0.3 dB
Transmission Shape: Flat-top
Wavelength/Temperature Sensitivity: 0.002 nm/°C
Fiber Type: SMF-28 (or SMF-28e)
Operating Temperature: -10 + 55 °C
Storage Temperature: -30 +70 °C

Got questions about specs? Use the inquiry form to ask.

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Features

  • Wide Tunable Wavelength Range: Offers a 45 nm tunable wavelength range, covering wavelengths from 1100 nm to 1650 nm for versatile applications.
  • Continuously Adjustable Bandwidth: Bandwidth can be smoothly adjusted from 1 nm to 18 nm, allowing precise control over filtering requirements.
  • Independent Wavelength and Bandwidth Tuning: Both the center wavelength and bandwidth are independently tunable, providing maximum flexibility for various optical setups.
  • Flat-Top Filter Profile: Features a flat-top passband with steep roll-off, ensuring minimal signal distortion and high-quality filtering.
  • Polarization Insensitive Design: Utilizes advanced techniques to keep polarization dependent loss (PDL) below 0.3 dB, making the filter virtually polarization independent and ideal for DWDM systems.
  • High Out-of-Band Suppression: Effectively suppresses unwanted signals outside the selected passband for cleaner signal transmission.
  • High Input Power Handling: Engineered to handle high optical input powers, suitable for demanding laboratory and industrial environments.
  • Multiple Fiber Compatibility: Available in singlemode, polarization maintaining (PM), and multimode fiber versions to suit a wide range of system requirements.
  • Manual Adjustment with Precision: Equipped with user-friendly adjustment knobs for precise manual control of both wavelength and bandwidth.
  • Robust Construction: Built with high-quality materials and advanced thin-film technology for long-term stability and reliability.
  • Custom Fiber Options: Can be constructed using customer-supplied fibers or alternative PM fiber structures upon request.
  • Ideal for Multiple Applications: Perfect for WDM channel filtering, high-speed transmission testing, signal filtering, laser pulse shaping, ASE noise suppression, tunable light sources, spectral analysis, fiber optic component manufacturing, quality control, and product development.

Applications

  • Wavelength Division Multiplexing (WDM) Channel Filtering
    Precisely select and isolate specific channels in dense WDM systems, enabling efficient signal routing and management in optical networks.
  • High-Speed Transmission Testing
    Evaluate and characterize the performance of high-speed optical transmission systems by filtering and analyzing specific wavelength bands.
  • Signal Filtering
    Remove unwanted spectral components or noise from optical signals to improve signal quality in communication and sensing applications.
  • Laser Pulse Shaping
    Tailor the spectral profile of laser pulses for applications in ultrafast optics, spectroscopy, and nonlinear optics.
  • ASE (Amplified Spontaneous Emission) Light Noise Suppression
    Suppress broadband ASE noise in optical amplifiers and sources, enhancing signal-to-noise ratio in fiber optic systems.
  • Tunable Light Sources
    Enable the creation of tunable laser sources by selecting and adjusting specific wavelength bands for research and development.
  • Spectral Analysis
    Perform detailed spectral measurements and analysis in laboratories, R&D, and quality control environments.
  • Fiber Optic Component Manufacturing
    Facilitate the testing and characterization of fiber optic components such as multiplexers, demultiplexers, and amplifiers.
  • Quality Control and Measurement
    Ensure compliance with specifications and standards by filtering and measuring optical signals during production and inspection processes.
  • Product Development
    Support the design, prototyping, and optimization of new photonic devices and systems by providing flexible wavelength and bandwidth control.
  • Optical Sensing Systems
    Enhance sensitivity and selectivity in fiber optic sensing applications, including environmental monitoring and biomedical diagnostics.
  • Research in Photonics and Quantum Optics
    Enable advanced experiments requiring precise spectral filtering, such as quantum communication and entanglement studies.
  • Optical Coherence Tomography (OCT)
    Improve axial resolution and image quality in OCT systems by fine-tuning the spectral bandwidth of the light source.
  • Telecommunications Network Maintenance
    Diagnose and troubleshoot network issues by isolating and analyzing specific wavelength channels in live fiber optic links.
  • Education and Training
    Serve as a versatile tool for teaching optical filtering, wavelength selection, and photonics principles in academic settings.

Frequently Asked Questions

What is a manually adjustable polarization insensitive variable bandwidth tunable filter?
A manually adjustable polarization insensitive variable bandwidth tunable filter is an optical device that allows users to independently tune both the center wavelength and bandwidth of the filter. It is designed to be polarization insensitive, ensuring consistent performance regardless of the polarization state of the input light. This makes it ideal for applications such as WDM channel filtering, signal filtering, and spectral analysis.
What wavelength and bandwidth ranges does this tunable filter support?
This tunable filter supports a wavelength tuning range of 45 nm, with available models covering wavelengths from 1100 nm to 1650 nm. The bandwidth can be continuously adjusted from 1 nm to 18 nm, allowing for precise control over the filter's passband.
How does the variable bandwidth tunable filter achieve independent tuning of wavelength and bandwidth?
The filter contains two independently variable tunable bandpass filters in series. By adjusting the overlap between the two filters' passbands, users can control the overall bandwidth. The center wavelength is tuned by changing the angle of incidence of light on each filter, allowing both the wavelength and bandwidth to be set independently.
Is the filter truly polarization insensitive, and what is its polarization dependent loss (PDL)?
Yes, the filter is designed to be polarization insensitive, making it suitable for use in systems where the polarization state may vary. The polarization dependent loss (PDL) is kept below 0.3 dB, ensuring minimal impact on performance due to polarization effects.
What fiber types are available for this tunable filter?
The filter is available with singlemode, polarization maintaining (PM), and multimode fiber options. OZ Optics typically uses PANDA fiber structure for PM components but can accommodate other fiber types, including customer-supplied fibers, upon request.
What are the main applications of this variable bandwidth tunable filter?
Main applications include WDM channel filtering, high-speed transmission testing, signal filtering, laser pulse shaping, ASE light noise suppression, tunable light sources, spectral analysis, fiber optic component manufacturing, quality control, and product development.
How does the flat-top filter shape benefit optical filtering applications?
The flat-top filter shape provides a uniform transmission across the passband with steep roll-off at the edges. This ensures minimal signal distortion and high out-of-band suppression, making the filter ideal for precise channel selection and noise reduction in optical communication and testing systems.

Got more questions? Use the inquiry form to ask the supplier directly.

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