Optics performance monitoring definitions

-

 Optics performance monitoring

  • Carrier Frequency Offset (MHz)—Carrier frequency offset in megahertz (mHz), which denotes the difference between the carriers (frequency shift in the receive spectrum) between the expected Rx carrier frequency and the actual carrier frequency

    CFO—Threshold values for carrier frequency offset

    CFO-Min—Low threshold setting trigger when the carrier frequency offset falls below this minimum value

    CFO-Avg—Average threshold setting trigger when the carrier frequency offset crosses this average value

    CFO-Max—High threshold setting trigger when the carrier frequency offset rises above this maximum value

  • Chromatic Dispersion—Lane or residual chromatic dispersion measured at the Rx transceiver port, which denotes the spreading of the signal in time resulting from the different speeds of light rays

    CD—Threshold values for chromatic dispersion

    CD-Min—Minimum value of the residual chromatic dispersion measured at the Rx transceiver port

    CD-Avg—Average value of the residual chromatic dispersion measured at the Rx transceiver port

    CD-Max—Maximum value of the residual chromatic dispersion measured at the Rx transceiver port

  • Differential Group Delay—Lane differential group delay, which denotes the time difference between the fractions of a pulse that are transmitted in the two principal states of polarization of an optical signal. For distances greater than several kilometers, and assuming random (strong) polarization mode coupling, DGD in a fiber can be statistically modeled as having a Maxwellian distribution.

    DGD—Threshold values for differential group delay

    DGD-Min—Minimum value of the differential group delay below which a TC is triggered

    DGD-Avg—Average value of the differential group delay at which TCA is triggered

    DGD-Max—Maximum value of the differential group delay above which a TCA is triggered

  • Module Temperature (°C)—Module temperature, which denotes the laser temperature in Celsius

    MT—Threshold values for module temperature

    MT-Min—High laser temperature in Celsius below which a TCA is sent

    MT-Avg—Average laser temperature in Celsius at which a TCA is sent

    MT-Max—Maximum laser temperature in Celsius above which a TCA is sent

  • Optical Lane Q2 Factor—Quality (Q or Q2) factor value estimated at the Rx transceiver port

    Lane Q2 factor—Threshold values for the quality factor

    Lane Q2 factor-Min—Minimum value of the quality factor estimated at the Rx transceiver port below which a TCA is sent

    Lane Q2 factor-Avg—Average value of the quality factor estimated at the Rx transceiver port at which a TCA is sent

    Lane Q2 factor-Max—Maximum value of the quality factor estimated at the Rx transceiver port above which a TCA is sent

  • Signal to Noise Ratio—Signal-to-noise ratio estimated at the Rx transceiver port

    SNR—Threshold values for signal-to-noise ratio

    SNR-Min—Minimum value of the signal-to-noise ratio estimated at the Rx transceiver port below which a TCA is sent

    SNR-Avg—Average value of the signal-to-noise ratio estimated at the Rx transceiver port

    SNR-Max—Maximum value of the signal-to-noise ratio estimated at the Rx transceiver port above which a TCA is sent

     

    • Optical Tx Output Power—Transmitted laser optical output power in dBm

      Tx-Pwr—Threshold values for transmitted laser output power

      TxPwr-Min—Minimum value of the transmitted laser output power in dBm below which a TCA is sent

      TxPwr-Avg—Average value of the transmitted laser output power in dBM at which a TCA is sent

      TxPwr-Max—Maximum value of the transmitted laser output power above which a TCA is sent

    • Optical Rx Input Power—Received laser optical input power in dBm

      Rx-Pwr—Threshold values for received laser input power

      RxPwr-Min—Minimum value of the received laser input power in dBm below which a TCA is sent

      RxPwr-Avg—Average value of the received laser power in dBm at which a TCA is sent

      RxPwr-Max—Maximum value of the received input power in dBm above which a TCA is sent

     

Comments

Post a Comment

Popular posts from this blog

What is CDR in Optical Modules

-
  What is CDR (Clock and Data Recovery) in Optical modules?   The full name of CDR is clock and data recovery, which can be simply understood as after the optical signal is converted into an electrical signal, the receiver performs electrical domain shaping and clock recovery.    CDR has two main functions 1. The first is to provide clock signal for each circuit of receiver;  2. The second is to judge the received signal, which is convenient for data signal recovery and subsequent processing.   Because when the optical signal is transmitted to a certain distance, it is usually long-distance transmission, and its waveform will appear a certain degree of distortion. The signals received by the receiver are pulse signals of different lengths. At this time, at the receiver, we can not get the data we need. Therefore, signal regeneration is needed at this time. Signal regeneration functions include re amplification, re shaping and re timin...
Read more

What is OpenZR+ for tranponder/muxponder

-
Image
Introduction OpenZR+ defines specifications for 1 00 - 400G single - wavelength optical ports for transceiver/transponder, muxceiver/ m uxponder ( TRXR/ TRPN , M U XR/M UXP ) node functions and for switch/router optical ports .   Open ZR+ Architecture   The architecture, shown in Figure 1 - 1 includes client sub - layers for up to four 100GBASE - R clients , up to two 200GBASE - R clients and a single 400GBASE - R client . Client data and alignment markers are extracted and re - timed to the line side clock domain using the general mapping protocol ( GMP ) . Retimed data plus GMP timing information is then mapped into one of the OpenZR+ frame formats . Those frames are multiplexed and OFEC encode d and become the payload of a DSP frame with DP - 16QAM, DP - 8QAM, or DP QPSK symbols .
Read more

Bit rate and Baud rate

-
In telecommunication Bit rate and baud rate are two important terms. Bit rate and baud rate play important role when we talk about Serial protocol  UART or modulation schemes like BPSK or QPSK   etc., Bit rate is the transmission of number of bits per second. It determines the number of bits traveled per second. Baud rate is defined as the number of signal units(also called as elements) per second. It determines how many times the state of a signal is changing.  For example baud rate is 9600 means 9600 signal level changes are happening within a second.It can determine how much bandwidth is required to send the signal. Relation between Bit rate(r), Baud rate(R), the number of bit per baud(n) Bit rate(r) = R x n Baud rate(R)= r/n
Read more