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Home > Products > Tunable Optical Filters > Bandwidth-Tunable Filters
Bandwidth-Tunable Filters  
Optoplex Bandwidth-Tunable Filter
Optoplex Bandwidth-Tunable Filter
  • Description
  • Features
  • Applications
Product Description - Bandwidth-Tunable Filter

Through cascading a low-pass tunable edge filter with a long-pass tunable edge filter, one can achieve a new type of bandwidth-tunable filter whose passband width is variable while its center wavelength is still tunable. With such a device, you can

  • Change passband width
  • Tune center wavelength
Bandwidth-tunable filter is a customized product. Optoplex provides individual tunable edge filters.
Features and Benefits of Bandwidth-Tunable Filter
  • Athermal Design
  • Wide Tuning Range, Cover C-Band or L-Band
  • Low & Uniform Insertion Loss
  • Latching and Low Power Consumption
  • Options of Electrical Connector from Side or Bottom
  • Support Both TTL and LVTTL
  • Telcordia GR-468 Qualified
Applications of Bandwidth-Tunable FIlter
  • Change pass bandwidth
  • Tune center wavelength of passband
  • Dynamically support 10Gb/s or 40Gb/s or 100Gb/s signals


Standard Specifications of ROADM1



100 GHz

Wavelength Tuning Range


1528 ~ 1563

Wavelength Tuning Resolution


Calibrated to ITU grids

Clear Bandwidth



Drop Channel Maximum Insertion Loss2,3



Drop Channel Ripple2,3



Drop Channel Adjacent Channel Isolation2,3



Drop Channel PDL2,3



Express Channel Insertion Loss2,3



Express Non-Adjacent Channel Ripple2,3



Express Adjacent Channel Ripple2,3



Express Channel Isolation (drop in express)2,3



Express Channel PDL2,3






Wavelength Setting Error4


< ±4

Wavelength Repeatability4



Wavelength Temperature Dependence2


< ±1 (typical)

Return Loss2



Maximum Input Optical Power



Tuning Speed (channel to channel, depending on originating and destination channels)


5 ~ 10

Tuning Power Consumption


< 1800 (peak); < 300 (idle)

Tuning Voltage


5 (DC)

Electronic Interface



Operating Temperature


0 ~ 65

Storage Temperature


-40 ~ 85

Dimension (L x W x H)5


88 x 62


  1. Certain parameter specifications can be varied based on customer needs.
  2. Over the stated spectral and operating temperature ranges and all polarization states.
  3. Within clear bandwidth.
  4. Alignment related at a given temperature.
  5. Including collimator sleeve and control PCB.
Typical Performance of ROADM
Parameter Definition of DPSK Demodulator

Parameter Definition


Wavelength Tuning Range (nm) is the spectral range over which a ROADM'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-designedbandwidth-tunable filter product, please provide the following parameters:
  • Wavelength range
  • Tuning accuracy
  • Fiber length
  • Optical connector type