task: to organize the transmission of 200G coherent channel between Data Center1 (Nizhny Novgorod) and Data Center2 (Moscow)
solution:The transmission of the 200G channel will be carried out over the optical fiber of the backbone provider, from which our client rents one DWDM channel.
To solve this task, you will need such active equipment as:
-The Newnets NS-DWDM-OP01-AC transport platform acts as a chassis for service cards and the main control node of the system.
-NS-M2Q-C2 muxponder, has two QSFP28 interfaces and one CFP2 interface, the board combines two 100G client signals into one coherent 200G DWDM channel
-100G NS-QSFP+28-100G-DAC-A1 optical modules for connecting the client side of the muxponder to the client's switching equipment
-Coherent optical module CFP2 NS-T200GC2 for the organization of a modulated signal 200G_8QAM

Requirements for the 200G_8QAM channel:
dispersion tolerance is 20,000 ps\nm
OSNR sensitivity is 18 dB
BER more then 2e-2
Receiver sensitivity - -24 dB

Technical task:
To organize the transmission of a coherent 200G channel over two optical fibers in the sections:
- Novosibirsk - Kemerovo 328 km
- Novosibirsk – Yurga 213 km
- Yurga – Kemerovo 115 km
- Yurga – Tomsk 140 km
- Kemerovo - Novokuznetsk 312 km
- Barnaul - Novokuznetsk 465 km
- Barnaul - Biysk 171 km
- Barnaul - Novosibirsk 331 km

Provide for the availability of input/output equipment for the organization of channels in the sections:
- Novosibirsk - Iskitim
- Novosibirsk - Berdsk
- Novosibirsk - Yurga
- Kemerovo - Yurga
- Kemerovo - Leninsk-Kuznetsky
- Kemerovo - Belovo
- Kemerovo - Prokopyevsk
- Novokuznetsk - Leninsk-Kuznetsky
- Novokuznetsk - Belovo
- Novokuznetsk - Prokopyevsk
- Barnaul - Iskitim
- Barnaul - Berdsk

To organize the network, provide Edfa amplifiers in all areas to increase the signal level and its correct detection

solution:
To organize coherent 200G channels between objects, the following equipment will be required:
-Newnets NS-DWDM-OP01-DCI-AC transport DCI platform, acts as a chassis for service cards and the main control node of the system.
-NSD2 muxponder, has four QSFP28 ports, two CFP2 interfaces, muxponder allows you to organize two coherent 200G channels from four 100G client interfaces
-Optical modules 100G NS-QSFP+28-100G-DAC-A1 for connecting the client side of the mucosponder to the client's switching equipment
-Coherent optical module CFP2 NS-T200GC2 for the organization of a modulated signal 200G_8QAM

Equipment will be required to organize amplification and multiplexing points:
-The Newnets NS-DWDM-OP01-AC transport platform acts as a chassis for service boards (EDFA amplifiers and DWDM multiplexers) and the main control node of the system.
-The NS-B17 amplifier EDFA card is installed at the beginning of the optical path to amplify DWDM signals to a maximum level of 18dB
-The NS-L25 amplifier EDFA card is installed at intermediate points or on the receiving side of the optical path to amplify DWDM signals, the gain coefficient is 25dB.
-NS-DM2x4 card, the service card has a multiplexer and a four-wavelength demultiplexer on board, in the future this board will expand its network capacity to 4X200G
-the NS-DO2-2 card, the OADM multiplexer service card, installed at intermediate points for the input/output of the DWDM channel, the card data is distributed for future network expansion.

Technical task
Building a network, starting with 3x10G channels on a single fiber and reserving the optical path according to the 1:1 scheme for a distance of 35 km with the possibility of expansion up to 16x10G.

solution:
to organize the network, you will need the following equipment:
-Newnets NS-DWDM-OP01-AC transport platform, which acts as a chassis for service cards and the main control node of the system.
-The NS-B17 amplifier EDFA card is installed at the beginning of the optical path to amplify DWDM signals to a maximum level of 18dB
-The NS-L25 amplifier EDFA card is installed on the receiving side of the optical path to amplify DWDM signals, the gain coefficient is 25dB.
-OLP-BiDi optical path redundancy card, the card consists of an optical receiver and an optical switch, the receiver monitors the status of the main and backup lines,
at the moment of interruption of the main transmission path, a switch is triggered that redirects traffic transmission to the backup fiber
- optical transceivers DWDM NS-SFP+DxxL80D
-RB Filter card, Red Blue Filler is a passive component that divides the general DWDM spectrum into two parts: Red (21-36 Ch), Blue(45-60 Ch), designed to separate the reception and transmission paths for
correct installation of EDFA amplifiers.

task: to organize the transmission of a coherent 200G channel between Data Center1 (Rostov-on-Don) and Data Center2 (Moscow)

decision:
To solve this task, you will need such active equipment as:
-Newnets NS-DWDM-OP01-DCI-AC DCI transport platform, acts as a chassis for service cards and the main control node of the system.
-NSD3 muxponder, has two QSFP28 ports, ten SFP+ and one CFP2 interfaces, the muxponder allows flexible formation of a coherent 200G channel
assembled from 10G or 100G client interfaces

-100G NS-QSFP+28-100G-DAC-A1 optical modules for connecting the client side of the muxponder to the client's switching equipment
-optical modules with SFP+ interface can also be used, but they are not used in this case
-Coherent optical module CFP2 NS-T400GC2* for the organization of a modulated signal 200G_8QAM

*The OSNR on the optical line was 17 dB, this value does not allow the use of CFP2 NS-T200GC2 modules, since these transceivers support modulation formats 200G_8QAM, 200G_16QAM
with the OSNR requirement of 18dB and 20dB respectively. In this case, we had to resort to CFP2 400G modules, which support 200G operation mode with QPSK modulation format with
a requirement for OSNR 15dB.

Requirements for the 200G_QPSK channel:
dispersion tolerance is 20,000 ps\nm
OSNR sensitivity is 15 dB
BER more then 2e-2
Receiver sensitivity - -24 dB