Hello there, Community!
This post is about the general rules for LH WDM product dispersion compensation. Please have a read further down for more details.
NOTE
Because of different application scenarios, LH WDM products and Metro or NG WDM products are subject to different rules for dispersion compensation.
The following rules for compensation configuration apply to 40x10G and 80x10G systems:
A. Configure a 20 km DCM for pre-compensation at the transmit end of the OTM station according to the fiber type.
B. Select a DCM for 100% line dispersion compensation according to the fiber type. In addition, adjust the dispersion topology in certain conditions to reduce the number of amplifiers.
C. At the receive end of the OTM station, the residual dispersion after dispersion compensation must meet the requirement specified in the OSNR optimization specification table. The DCM at the receive end is divided into two parts. One is DCM-A (20 km) or DCM-T (10 km), which is placed at the upper-level OLA station to optimize the system dispersion window.
D. When the OSNR value in the system design is 2 dB higher than that specified in the table, the DCM mentioned in step C need not be divided.
OSNR OPTIMIZATION SPECIFICATIONS
40×2.5G system specifications
Transmission kilometrage L (km) | L<500 | 500<L<600 | L>600 | 10G system mixed transmission network, with the complete dispersion compensation |
Dispersion tolerance after compensation | NA | Provide such dispersion compensation that the uncompensated distance L is smaller than 500 km. The OSNR should be larger than 14 dB. | Provide the dispersion compensation. L is smaller than 600 km. | NA |
40×10G system specifications
SMF-28 (G.652) 100 GHz spaced E3LWF-AFEC NRZ (LWF-AFEC, TMX, LOG, LBF, ETMX) system specifications:
Residual dispersion after system dispersion compensation | –10 km to +20 km |
SMF-28 (G.652) 100 GHz spaced E3LWFS-AFEC DRZ (LWFS-AFEC, TMXS, LOGS, LBFS, ETMXS) system specifications:
Number of spans | 1–12 | 13–16 | >=17 |
Residual dispersion after system dispersion compensation | –40 km to +35 km | –25 km to +30 km | –15 km to +20 km |
LEAF (G.655) 100 GHz spaced E3LWF-AFEC NRZ (LWFS-AFEC, TMXS, LOGS, LBFS, ETMXS) system specifications:
Number of transmission spans (N) | (N<=10) | (11<N<=15) | (15<N<=20) |
Dispersion tolerance | –40 km to +80 km | 0 km to +80 km | +10 km to +80 km |
LEAF (G.655) 100 GHz spaced E3LWFS-AFEC DRZ (LWFS-AFEC, TMXS, LOGS, LBFS, ETMXS) system specifications:
Number of transmission spans (N) | (N<=12) | (13<N<=16) | (17=<N) |
Dispersion tolerance | –140 km to +120 km | –95 km to +95 km | –70 km to +80 km |
80×10G system specifications
SMF-28 (G.652) 50 GHz spaced E3LWF-AFEC NRZ (LWF-AFEC, TMX, LOG, LBF, ETMX) system specifications:
Channel spacing | 50 GHz |
Incident optical power of the amplifier | +1 dBm |
Dispersion tolerance | –10 km to +20 km |
Dispersion tolerance | –10 km to +20 km |
SMF-28 (G.652) 50 GHz spaced E3LWF-AFEC DRZ (LWFS-AFEC, TMXS, LOGS, LBFS, ETMXS) system specifications:
Channel spacing | 50 GHz | ||
Incident optical power of the amplifier | +1 dBm | ||
Number of spans | 1–12 | 13–16 | >=17 |
Dispersion tolerance | –40 km to +35 km | –25 km to +30 km | –15 km to +20 km |
LEAF (G655) 50 GHz spaced E3LWF-AFEC NRZ (LWF-AFEC, TMX, LOG, LBF, ETMX) system specifications:
Number of transmission spans (N) | (N<=8) | (8<N<=12) | (12<N<=16) |
Channel spacing | 50 GHz | 50 GHz | 50 GHz |
Incident optical power of the amplifier | +1 dBm | +1 dBm | +1 dBm |
Dispersion tolerance | 0 km to +60 km | +10 km to +60 km | +20 km to +60 km |
LEAF (G.655) 50 GHz spaced E3LWFS-AFEC DRZ (LWFS-AFEC, TMXS, LOGS, LBFS, ETMXS) system specifications:
Number of transmission spans (N) | (N<=12) | (12<N<=16) | (17<=N) |
Channel spacing | 50 GHz | 50 GHz | 50 GHz |
Incident optical power of the amplifier | +1 dBm | +1 dBm | +1 dBm |
Dispersion tolerance | –140 km to 120 km | –95 km to 95 km | –70 km to 80 km |
Here's where you may contact us:
https://forum.huawei.com/enterprise/en/Transport-Access-Network/forum/875.
Thank you!
