What is the ITU grid?
The most common frequency grid used for fiber-optic communication is that used for channel spacing in Dense Wavelength Division Multiplexing (DWDM) at wavelengths around 1550 nm and defined by ITU-T G. 694.1. The grid is defined relative to 193.1 THz and extends from 191.7 THz to 196.1 THz with 100 GHz spacing.
What is bandwidth of DWDM?
DWDM has the capability to carry 40 Gbps, 100 Gbps and 400 Gbps data in a single core of fiber optic cable. DWDM transceivers require very delicate technology and accurate wavelength splitting as the channel spacing is very small.
Which band does conventional DWDM usually use?
Dense WDM (DWDM) uses the C-Band (1530 nm-1565 nm) transmission window but with denser channel spacing. Channel plans vary, but a typical DWDM system would use 40 channels at 100 GHz spacing or 80 channels with 50 GHz spacing. Some technologies are capable of 12.5 GHz spacing (sometimes called ultra-dense WDM).
What is the range of C-band and L band?
Performance monitors operating in both bands simultaneously must cover a wavelength range from 1500 to 1630 nm. Optical channels are concentrated in the C-band around 1530 to 1563 nm and in the L-band around 1575 to 1610 nm.
What frequency is DWDM?
Dense Wavelength Division Multiplexing (DWDM) ITU Grid
| Fiberdyne Labs, Inc. Dense Wavelength Division Multiplexing (DWDM) | ||
|---|---|---|
| ITU Grid: C-Band, 100 GHz Spacing | ||
| Channel | Frequency | Frequency |
| (#) | (GHz) | (GHz) |
| 1 | 190100 | 193700 |
What are ITU channels?
1 defines the standard DWDM wavelength range as 1528.77 to 1563.86nm. The complete channel grid for 100GHz DWDM is shown below….DWDM Wavelength ITU Channel Reference – 100 GHz Spacing.
| ITU Channel Number | Wavelength, nm | Freq., THz |
|---|---|---|
| 17 | 1563.86 | 191.7 |
| 18 | 1563.05 | 191.8 |
| 19 | 1562.23 | 191.9 |
| 20 | 1561.42 | 192.0 |
What is SDH and DWDM?
SONET/SDH is the dominant technology deployed in most metro and long distance networks. DWDM (Dense Wavelength Division Multiplexing) is essentially a method of increasing the bandwidth available over existing fibre. This makes it cost-effective, as DWDM can be used instead of laying more fibre strands.
What is the range of C-band and L-band?
Are C-band satellites still used?
C-band is currently used for the “satellite downlink” for broadcast television distribution.