CWDM Three Port Device | Definitions | Corning

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Definitions

Definitions

Definitions

CWDM 3-Port Device Optical Parameter Definition and Test Requirements

Abbreviations

  • DWDM - Dense Wavelength Division Multiplexing
  • CWDM - Coarse Wavelength Division Multiplexing
  • ITU - International Telecommunication Union
  • ITU-T - Telecommunication Standardization Sector of ITU
  • ILmax - Maximum Insertion Loss
  • ILmin - Minimum Insertion Loss
  • PDL - Polarization Dependent Loss
  • PMD - Polarization Mode Dispersion

Optical Parameter Definitions for CWDM 3-Port Devices

  • Channel Spacing

    All the optical parameter definitions for CWDM will be similar to DWDM except the channel spacing for CWDM is 20 nm

  • Center Wavelength

    The center wavelength of CWDM is not on DWDM ITU-T grid. For 8-channel CWDM, they are 1YY0(or 1YY1) nm, YY = 47, 49, 51, 53, 55, 57, 59, 61

  • Minimum Passband Width

    Defined as IYY ±B/2, this is a spectral width value centered on the ITU-T specific wavelength IYY. YY is used to denote the channel number associated with the pass channel of a filter.

  • Adjacent Channel

    The adjacent channels of channel YY are channel YY-2 and channel YY+2.

  • Non-Adjacent Channel

    The non-adjacent channels of channel YY are channel YY-4 and below and channel YY+4 and above

  • Maximum Pass Channel Insertion Loss ILmax

    This is the loss measured from the 0 dB level to the pass channel spectrum minimum point in the minimum passband region for channel YY over temperature and all polarization states.

  • Minimum Pass Channel insertion Loss ILmin

    The is the loss measured from the 0 dB level to the pass channel spectrum peak in the minimum passband region for channel YY over temperature and all polarization states.

  • Passband Ripple

    This is the difference between ILmax and ILmin for a given pass channel in any one state of temperature and polarization.

  • Adjacent Channel Isolation

    This is the difference between the minimum point on the pass channel spectrum within the minimum passband of channel YY over temperature and the maximim point within the adjacent channels minimum passband over temperature and all polarization states.

  • Non-Adjacent Channel Isolation

    This is the difference between the minimum point on the pass channel spectrum within the minimum passband of channel YY over temperature and the maximum point within minimum passband across all non-adjacent channels over temperature and all polarization states.

  • Maximum Adjacent Channel insertion Loss at Express Port

    This is the loss measured from the 0 dB level to the express channel spectrum minimum point in the minimum passband region for adjacent express channels over temperature and all polarization states. 

  • Maximum Non-Adjacent Channel Insertion Loss at Express Port

    This is the loss measured from the 0 dB level to the express channel spectrum minimum point in the minimum passband region across all non-adjacent express channels over temperature and all polarization states.

  • Pass Channel Residual at Express Port

    This is the difference between the minimum point on the express channel spectrum within the minimum passband of adjacent channels over temperature and the maximum point within the minimum passband of pass channel YY over temperature and all polarization states.

  • Return Loss

    The return loss is the back reflectance along the same optical path from any port with the other ports optically terminated. The return loss spec applies to the minimum passband of channel YY and the minimum passband of all its adjacent and non-adjacent channels over temperature.

  • Directivity

    The directivity is the leakage of signal into undesirable optical path due to scattering, which is the insertion loss between pass port and express port with the common port optically terminated for 3-port device. It applies to the minimum passband of channel YY and the minimum passband of all its adjacent and non-adjacent channels over temperature.

  • Polarization Dependent Loss (PDL)

    PDL is the maximum difference in attenuation of signals over all states of polarization. It applies to the minimum passband of channel YY and the minimum passband of all its adjacent and non-adjacent channels over temperature.

  • Polarization Mode Dispersion (PMD)

    PMD is the dispersion of an optical signal due to the different polarizations of light traveling at different speeds through optical component. It applies to the minimum passband of channel YY and the minimum passband of all its adjacent and non-adjacent channels over temperature.

  • Temperature Range of Operation

    The temperature range over which the filter is expected to maintain measured values within all defined specifications.

  • Optical Input Power Range

    The filter will meet all specifications while the total power at any port remains within the range 0 mW to maximum power.

Test Requirement

  • IL, PDL, and Isolation Test Requirement

    IL, PDL, and isolation data need to be collected over the minimum passband width of the pass channel and/or its adjacent and non-adjacent channels. The spec applies to whole temperature range of operation and all polarization states. If the PDL variation over the minimum passband of pass channel is very small, single point test at passband CWL will be sufficient. Also the express channel PDL and pass channel PDL over the minimum passband width of its adjacent and non-adjacent channels are very small and can be neglected.

  • Return Loss and Directivity Test Requirement

    Directivity and pass-port RL data need to be collected over the minimum passband width of the pass channel; however, the common port and express port RL data needs to be collected over the minimum passband width of the pass channel and its adjacent and non-adjacent channels.