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Home > Products > F-P Etalon Products > Flat-Top Comb Filters
Flat-Top Optical Comb Filters  
 
Optoplex Flat-Top Optical Comb Filter
Optoplex Flat-Top Optical Comb Filter
     
Comb Filter PDF Datasheet
  • Description
  • Features
  • Applications
  • Specifications
  • Typical Performance
Product Description - Flat-Top Optical Comb Filter

Optoplex provides costomized flat-top optical comb filter based on its optical interleaver technology. In contrast with traditional Fabry-Perot cavity-based comb filter, Optoplex's comb filter is capable of transmitting modulated DWDM signals with its passband width available anywhere down to a few GHz. Both the filter channel spacing(FSR) and filter duty cycle (3-dB bandwidth to FSR ratio) can be specified by customers.

Based on Optoplex's patented technologies of micro-optics and phase modulation through thin-film coating, the flat-top comb filter is a purely passive device characterized by minimal temperature dependence, flat-top passband, high channel isolation, low PDL, and uniform insertion loss. The product is Telcordia GR-1221 qualified.

Typical spectra of Optoplex comb filter

Features and Benefits of Optical Comb Filter
  • Wide and Flat Passband
  • Minimal PDL
  • High Isolation
  • Minimal Thermal Drift
  • Low and Customizable Dispersion
  • Low Insertion Loss & IL Uniformity
  • Dual C- and L-Band Coverage
  • Telcordia GR-1221/63 Qualified
Applications of Optical Comb Filter
  • Noise Suppression in DWDM System
  • Passband Reduction of Signals with High Modulation Rate
  • Reshape Signal Passband
  • Optical Ruler in DWDM System
Standard Specifications of Optical Comb Filter

Parameter

Unit

Data

Wavelength Range nm 1527 ~ 1567 or 1567 ~ 1607
Channel Spacing GHz 50
Inserion Loss (at center frequency, without connector) dB 2.0
Insertion Loss Uniformity dB < 0.5
PDL dB < 0.4
Central Frequency Error GHz < 2
Bandwidth at 1 dB GHz > 3
Bandwidth at 3 dB GHz < 10
Bandwidth at 20 dB GHz < 22
Return Loss dB > 40
Operating Temperature °C -5 to 65
Storage Temperature °C -40 to 85

Notes:

  1. Certain parameter specs can be varied based on customer demands.
  2. 25GHz, 33.3GHz, 50GHz, 100GHz, and other channel spacings are available.
Typical Performance of Optical Comb Filter
Typical spectra of Optoplex comb filter
Note: Results obtained over temperature from -5 to 65°C
Parameter Definition of Optical Comb Filter

Parameter Definition

Example

Wavelength Range (nm) is defined as wavelength range over which the Optical Performance Monitor (OPM) or Optical Channel Monitor (OCM) can measure the power and wavelength of the optical channels.

1530.33 - 1563.05 nm

Channel Number is the total number of channels defined in a channel plan that the OPM / OCM can identify.

42

Channel Spacing (GHz) is the equal frequency separation between two neighboring channels in DWDM system.

100 GHz

Input Wavelength Tolerance (GHz) defines the maximally allowed deviation of input laser away from ITU grid or channel plan. This parameter defines the minimum channel spacing. For example, for Input wavelength tolerance = ±5 GHz, channel spacing = 50 GHz, the minimum channel spacing will be 40 GHz in the worst case.

±5 GHz

Adjacent Channel Power Difference (dB) is maximum power difference between any two adjacent channels

12 dB

Non-adjacent Channel Power Difference (dB) is maximum power difference between any two non-adjacent channels

20 dB

Maximum Input Power (dBm) is total input optical power of all channels that is allowed to the OPM.

23 dBm

Channel Input Power Range (dBm) is the measurement power range of each channel when power and wavelength can be correctly reported.

-40 to -10 dBm

Absolute Channel Power Accuracy (dB) is defined as ±Max (|DPi|) over all the channels and operating temperature range, where DPi is the power measurement error against a calibrated power meter for the channel i.

± 0.5 dB

Relative Channel Power Accuracy (dB) is defined as the difference between the maximum and the minimum values of the power measurement error data across Spectral Range (all channels) at a measurement temperature. The worst-case value over all temperatures is used to specify Relative Channel Power Accuracy.

0.6 dB

Power Measurement Repeatability (dB) is the variation of a channel power measurement on a 1-minute interval at fixed peak power and polarization and at a constant temperature.

± 0.1 dB

PDL (dB) is the power difference between the two extreme polarization states.

0.3 dB

Absolute Wavelength Accuracy (pm) is defined as ±Max (|Dli|) over all the channels and operating temperature range, where Dli is the wavelength measurement error against a calibrated wavelength meter for the channel i.

± 50 pm

Relative Wavelength Accuracy (pm) is defined as the difference between the maximum and the minimum values of the wavelength measurement error data across Spectral Range (all channels) at a measurement temperature. The worst-case value over all temperatures is used to specify Relative Wavelength Accuracy.

60 pm

OSNR (dB) is measured as the ratio of a coherent signal power to a band-limited broadband noise source, normalized to 0.1-nm spectral window.

28 dB

Maximum OSNR (dB) is the highest OSNR that can be measured and still meet the OSNR accuracy and repeatability requirements. Its value depends on the input channel power level, noise floor, and filter isolation. See a typical example in the graph.

28 dB

OSNR Range is the maximum and minimum OSNR values, within which OPM can report OSNR with OSNR error < OSNR Accuracy.

10 ~ 25 dB

OSNR Accuracy (dB) is defined as ±Max (|DOSNRi|) over all the channels and operating temperature range, where DOSNRi is the OSNR measurement error against a calibrated Optical Spectrum Analyzer for the channel i.

± 1.5 dB

Noise Floor (dBm) is defined as electronics noise without light input.

-60 dBm

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

Response Time (ms) is the time required to perform the measurements of OSNR, power, and wavelength for all channels and transfer these values over the communications interface to the central controller.

500 ms

Power Consumption (W) is defined as peak electrical power when the OPM operates.

2 W

Operating Temperature (°C) is the ambient temperature range over which the device can be operated and maintain its specifications.

-5 to 65 °C

Storage Temperature (°C) is the ambient temperature range over which the device can be stored without damage and can be operated over operating temperature according to its specifications.

-40 to 85 °C

Product Request and Ordering Information
Please speak to Optoplex Sales persons. If you request custom-designed comb filter product, please provide the following parameters:
  • Wavelength range
  • Free spectral range (FSR)
  • Pass bandwidth
  • Fiber length
  • Optical connector type