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Home > Products > Tunable Optical Filters > 2-Port Optical Tunable Filter
2-Port Optical Tunable Filter  
Optoplex Tunable Optical Filter - Optical Tunable Filter
Optoplex Tunable Optical Filter - Optical Tunable Filter
Optoplex Tunable Optical Filter - Optical Tunable Filter
PDF Datasheet
  • Description
  • Features
  • Applications
  • Specification
  • Typical Performance
  • Parameter Definition
Product Description - Tunable Optical Filter

Optoplex's Tunable Optical Filter, also known as Optical Tunable Filter or Tunable Bandpass Filter, is an integrated module, consisting of micro optics and electronics. When receiving a stream of optical signals of a plurality of wavelengths from the Input-Port (IN), the 2-port tunable optical filter directs a selected channel to the Output-Port (OUT). The selected channel can be varied (tuned) within the operating wavelength (frequency) range by a remote command sent through the built-in control PCB and firmware.

Optoplex's Tunable Optical Filter is based on a patented micro-optic design and thin-film interference filter coating technology. The thin-film filter used in tunable optical filter is very similar to those already widely used in DWDM devices. The wavelength tuning is achieved by varying the incident angle of the incoming light beam on the thin-film filter. Each single device is optimized to cover either C- or L-band wavelengths. The standard tunable optical filter product family supports 100- and 50-GHz channel-spacing.

For 3-port tunable optical filter, please visit Reconfigurable Optical Add/Drop Multiplexer (ROADM) page.

Schematic diagram of Optoplex 2-port tunable optical filter

Features and Benefits of Tunable Optical Filter
  • Athermal Design
  • Wide Tuning Range, Cover C-Band or L-Band
  • Flat and Wide Passband for up to 40 Gb/s Signals
  • Low & Uniform Insertion Loss
  • High Channel Isolation
  • Latching and Low Power Consumption
  • Options of Electrical Connector from Side or Bottom
  • Support Both TTL and LVTTL
  • 3-Port ROADM Device Available
  • Telcordia GR-468 Qualified
Applications of Tunable Optical Filter
  • Dynamic wavelength selection in DWDM systems
  • Signal demultiplexing for DWDMs
  • Optical performance monitoring
  • Tunable optical noise filtering
  • Noise suppression for optical amplifiers
Standard Specifications of DPSK Demodulator



50 GHz

100 GHz

Wavelength Tuning Range nm C-band: 1528 ~ 1562
L-band: 1567 ~ 1603
Wavelength Tuning Resolution THz ~ 10 pm or
Calibrated to ITU grids
Passband Width1 @ 0.5 dB GHz - >30
Passband Width1 @ 1.0 dB GHz >16 -
Passband Width1 @ 3.0 dB GHz 25 (Typical) 50 (Typical)
Passband Width1 @ 20 dB GHz < 85 -
Passband Width1 @ 25 dB GHz - <150
Peak Insertion Loss1 (without connector) dB <5.0 <3.0
Polarization Dependent Loss1 dB <0.3 within CW±5GHz <0.4 within CW±10GHz
Polarization Mode Dispersion ps 0.5 0.3
Chromatic Dispersion1 ps/nm <± 100 within CW ±5GHz <± 50within CW ±12GHz
Wavelength Setting Error2 GHz <±4
Wavelength Repeatability2 GHz ±1
Wavelength Temperature Dependence pm/°C <± 1 (Typical)
Return Loss dB > 40
Maximum Input Optical Power mW 300
Tuning Speed (channel to channel, depending on originating and destination channels) sec <10 5 ~ 10
Tuning Power Consumption mW <1800 (Peak); <300 (Idle)
Tuning Voltage V 5 (DC)
Electronic Interface mW RS232
Operating Temperature °C 0 to 65
Storage Temperature °C -40 to 85
Dimension (L x W x H)3 mm 84 x 61 x 16


  1. Over the stated spectral and operating temperature ranges and all polarization states.
  2. Related to mechanical accuracy at a given temperature.
  3. Including collimator sleeve and control PCB.
Typical Performance of Tunable Optical Filter (100 GHz)
Typical spectra of Optoplex 2-port tunable optical filter
Temperature performance of Optoplex 2-port tunable optical filter
Parameter Definition of Tunable Optical Filter

Parameter Definition


Wavelength Tuning Range (nm) is the spectral range over which a tunable optical filter's center wavelength can be tuned and performance specification can be met..

1527.994 ~ 1563.047 nm

Wavelength Tuning Resolution (GHz) is the minimum tuning step of a tunable filter.

10 pm

Passband Width @ X-dB Down (GHz) is the full spectral width centered at the ITU grid measured at X-dB below the minimum insertion loss point. Usually, X = 0.5, 1, 3 and 20.

35 GHz @0.5-dB down for 100 GHz channel spacing

Peak Insertion Loss (dB) is power difference between the 0-dB level and the maximum power level measured within a given passband window.

2.5 dB

Polarization Dependent Loss (PDL) (dB) is the difference between the maximum and minimum insertion loss over all polarization states within a given passband window.

0.3 dB within CW ± 12 GHz

Polarization Mode Dispersion (PMD) (ps) is the maximum Differential Group Delay within a given passband width.

0.3 ps

Chromatic Dispersion (CD) (ps/nm) is the derivative of the Group Delay versus wavelength within a given passband width.

± 25 ps/nm within CW ± 12 GHz

Wavelength Setting Error (GHz) is the difference between a channel central wavelength (usually defined using 3-dB bandwidth) and the target wavelength (usually the ITU grid) during tuning.

± 4 GHz

Wavelength Repeatability (GHz) is the repeatability of a channel central wavelength (usually defined using 3-dB bandwidth) during repeated tuning.

± 1 GHz

Wavelength Temperature Dependence (pm/°C) is the rate of a channel central wavelength versus temperature.

± 1 pm/°C

Optical Return Loss (dB) is the ratio between the input power and the reflected power over all polarization states at each port , RL = -10×log10(Pr/Pin).

40 dB

Tuning Speed (s) is the time needed by a tunable filter to tune from one channel to another. It is dependent on the originating and destination channels. The longest time required is specified.

6 s

Operating Temperature (°C) is the ambient temperature range over which the device's performance spec can be met.

-5 to 65 °C

Storage Temperature (°C) is the ambient temperature range over which the device can be stored without affecting its intended application afterwards.

-40 to 85 °C

Product Request and Ordering Information
Please speak to Optoplex Sales persons. If you request custom-designed tunable optical filter product, please provide the following parameters:
  • Wavelength range
  • Channel spacings
  • Pass bandwidth
  • Fiber length
  • Optical connector type