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Home > Products > Tunable Optical Filters > 3-Port ROADM / TOADM
3-Port ROADM / TOADM  
Optoplex 3 Port Tunable Filter
Optoplex 3 Port Tunable Filter
PDF Datasheet
  • Description
  • Features
  • Applications
  • Specification
  • Typical Performance
  • Parameter Definition
Product Description - Reconfigurable Optical Add/Drop Multiplexer

Optoplex's Reconfigurable Optical Add/Drop Multiplexer (ROADM) module, also known as Tunable Optical Add/Drop Multiplexer (TOADM), is based on a proprietary micro-optics and micro-actuator design, athermal packaging technology, and state-of-the-art thin-film coating. When receiving a stream of optical signals of a plurality of wavelengths from the Input-Port (IN), this 3-port ROADM device directs a selected channel to the Drop-Port (ADD/DROP) and the remaining channels to the Express-Port (EXP), as depicted in the figure below. This tunable feature can also be used for adding a channel, when the device is used in reverse. Cascading two ROADM modules, simultaneous add and drop functions can be achieved. Each single ROADM device is optimized to cover either C- or L-band wavelengths. The standard 100- or 200-GHz channel spacing ROADM products allow for single-channel drop. Customized banded-channel drop ROADMs are available upon request.

For 2-port Optical Tunable Filter, please visit Optical Tunable Filter page.

Schematic diagram of Optoplex 3-port tunable optical filter

Features and Benefits of ROADM
  • Athermal Design
  • Wide Tuning Range, Cover Entire C- or L-Band
  • Flat and Wide Passband for up to 40 Gb/s Signal
  • Low & Uniform Insertion Loss
  • High Channel Isolation
  • Latching and Low Power Consumption
  • 2-Port Tunable Filter Available
  • Telcordia GR-468 Qualified
Applications of ROADM
  • Dynamically reconfigure channels
  • 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 ROADM1



100 GHz

Wavelength Tuning Range nm 1528 ~ 1563
Wavelength Tuning Resolution THz Calibrated to ITU grids
Clear Bandwidth GHz ITU±10
Drop Channel Maximum Insertion Loss2,3 dB 2.8
Drop Channel Ripple2,3 dB 0.3
Drop Channel Adjacent Channel Isolation2,3 dB >25
Drop Channel PDL2,3 dB <0.5
Express Channel Insertion Loss2,3 dB <2.3
Express Non-Adjacent Channel Ripple2,3 dB <0.1
Express Adjacent Channel Ripple2,3 dB <0.5
Express Channel Isolation (drop in express)2,3 dB >25
Express Channel PDL2,3 dB <0.5
PMD2,3 ps <0.5
Wavelength Setting Error4 GHz < ±4
Wavelength Repeatability4 GHz ±1
Wavelength Temperature Dependence2 pm/°C < ±1 (typical)
Return Loss2 dB >40
Maximum Input Optical Power mW 300
Tuning Speed (channel to channel, depending on originating and destination channels) sec 5 ~ 10
Tuning Power Consumption mW < 1800 (peak); < 300 (idle)
Tuning Voltage V 5 (DC)
Electronic Interface - RS232
Operating Temperature °C 0 ~ 65
Storage Temperature °C -40 ~ 85
Dimension (L x W x H)5 mm 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
Typical spectra of Optoplex 3-port tunable optical filter
Typical spectra of Optoplex 3-port tunable optical filter
Parameter Definition of 3-Port Tunable Optical Filter

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-designed TOADM/ROADM product, please provide the following parameters:
  • Wavelength range
  • Channel spacings
  • Pass bandwidth
  • Fiber length
  • Optical connector type