Replacement of optical modules with different channel spacings for 1600G devices

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Question:
WDM-side optical modules of the OTU boards on 1600G devices come in two types: 50 GHz and 100 GHz channel spacing ones. Can these two types of optical modules with the same frequency and rate replace each other?
Analysis:
The differences between the two types of optical modules are as follows: 1. Modules in a 50 GHz spacing system have high requirements on wavelength stability. A wavelength locker is integrated in a module, whereas the modules in a 100 GHz spacing system have no wavelength locker. 2. These two types of modules have different dispersion tolerances. The 50 GHz type has a dispersion tolerance of 1500 ps/nm, whereas the 100 GHz type has that of 800 ps/nm. However, with the improvement in processing techniques, the difference in dispersion tolerances will become smaller and smaller.
Answer:
1. The 100 GHz modules should not be used to replace the 50 GHz modules on the OTU boards. 2. The 50 GHz modules can be used to replace the 100 GHz modules. However considering different types of optical modules on the entire network, you are advised to replace modules with the same type modules.

Other related questions:
Difference between colored optical modules and colorless optical modules
Colored optical modules support fixed wavelengths. Colorless optical modules support multiple wavelengths and combine them into white light. Therefore, colorless optical modules support tunable wavelengths.

Channel spacing of 200G signals
For 10G, 40G, and 100G signals, the channel spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system. For 200G signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is variable. For example, if different modulation methods are used for 200G signals, the required bandwidth is different. For example, it can be 75 GHz or 150 GHz.Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

Functions of different modules on an LWF board on BWS 1600G
Question: What are functions of OTRG, OTTF, OTRB, OTRH, OTRM, OTRK, OTRC, and T2MZ modules on an LWF board on BWS 1600G? Answer: The LWF board supports multiple types of optical modules. WDM-side modules work in the C band (192.1�?96.0 THz) and L band (187.00�?90.90 THz) with the channel spacing being 50 GHz and 100 GHz respectively. The SDH side can be equipped with the SSA3OTRL and purchased transponders. The WDM side can be equipped with transponders, including SSE1OTRH, SSE1OTRB, SSE1OTTF, and SSE1OTRK. The board software identifies the module type by reading EEPROM data. SSE1OTRH uses 40 wavelengths in the C-band with 100 GHz channel spacing. The dispersion tolerance is greater than 800 ps/nm. The dispersion-limited space is 40 km. SSE1OTRM uses 160 wavelengths with the wavelength locking function. The channel spacing is 50 GHz. The dispersion tolerance is greater than 800 ps/nm. The dispersion-limited space is 40 km. SSE1OTRB uses 160 wavelengths with VOA and wavelength locking functions. The channel spacing is 50 GHz. SSX1T2MZ uses 160 wavelengths with the VOA function but without the wavelength locking function. The channel spacing is 50 GHz. SSE1OTTF uses tunable wavelengths with the wavelength locking function. SSE1OTRK uses 40 wavelengths in the C-band with 100 GHz channel spacing. SSE2OTRK uses 160 wavelengths with the wavelength locking function. The channel spacing is 50 GHz.

Whether an OTU board supports optical module replacement with an optical module of another wavelength
For OTU boards supporting pluggable SFP optical modules, the wavelength information depends on the optical modules, and therefore their optical modules can be replaced with optical modules of other wavelengths.

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