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Home > Products > Optical Monitors > Optical Wavelength Meter
Optical Wavelength Meter  
 
Optoplex Optical Wavelength Meter
Optoplex Optical Wavelength Meter
     
  • Description
  • Features
  • Applications
  • Specification
  • Typical Performance
Product Description - Optical Wavelength Meter

Optoplex Optical wavelength meter (OWM) uses proprietary thin-film interference filter in conjunction with Fabry-Perot cavity technology combined with a micro-actuator and high-speed electronics. Its working principle is schematically shown below. By comparison with Optical channel monitor / Optical performance monitor, the proprietary wavelength reference unit is introduced to ensure high precision wavelength measurements. Optoplex Optical wavelength meter is the only DWDM wavelength meter capable of measuring wavelengths of multi-lasers in DWDM networks over C-band and L-band wavelength range with a high accuracy better than that the wavelength locker can provide. For example, the device can simultaneously report 80 wavelength values of 80 channels at 50 GHz channel spacing with the wavelength accuracy ± 2 GHz. DPRAM, RS-232, or USB interfaces are available and OWM can be customized to meet specific requirements.

Working principle of Optoplex wavelength meter

Features and Benefits of Optical Wavelength Meter
  • High Dynamic Range
  • Low Temperature Sensitivity
  • High Reliability and Repeatability
  • High Wavelength Accuracy
  • High Wavelength Repeatability
  • Built-in Wavelength Reference
  • Compact Size
  • Firmware Upgradeable
  • Telcordia GR-468 Qualified
Applications of Optical Wavelength Meter
Standard Specifications of Optical Channel Monitor1
Parameter

Unit

Specification
Wavelength Range nm C band or L band
Input Power Range dBm -40 to -10
Absolute Wavelength Accuracy GHz < ± 2.5
Wavelength Repeatability GHz < ± 0.5
Wavelength Resolution (FWHM) nm < 0.3
Noise Floor dBm - 55
Response Time ms 1000
Power Consumption W < 2
Electronics Interface - RS232/DPRAM
Operating Temperature °C -5 to 65
Storage Temperature °C -40 to 85
Dimension2 mm 121 x 92

Notes:

  1. Certain parameter specs can be varied based on customer demands.
  2. Including PCB.
Typical Performance of Optical Wavelength Meter
Typical performance of Optoplex wavelength meter
Note: Results obtained over temperature from -5 to 65°C
Parameter Definition of Optical Channel Monitor

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 optical wavelength meter product, please provide the following parameters:
  • Wavelength range
  • Channel spacing
  • Wavelength accuracy
  • Fiber length
  • Optical connector type