How to do if the optical interfaces connected by a fiber cannot be Up

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Before checking a link, check whether the LINK indicator of the interface is on. If the indicator is on, the physical link is normal. Perform the following steps:

1.Check whether either of the interfaces is shut down. If an interface is shut down, run the undo shutdown command on it.
2.If the shutdown command is not used, check whether either of the two connected optical interfaces is the combo interface. If yes, run the display this interface command to check whether the interface is FORCE FIBER. If not, run the combo-port fiber command to change the interface to the forcible optical interface.
[HUAWEI-GigabitEthernet0/0/1] display this interface
......
Port Mode: FORCE FIBER
Speed : 1000, Loopback: NONE
Duplex: FULL, Negotiation: ENABLE
Mdi : NORMAL
......
3.If the two interfaces are both optical interfaces but cannot be Up, it is possible that one interface is an FE interface and the other is a GE interface. In this case, you need to disable auto-negotiation on the GE interface, set the operation mode of the GE interface to 100 Mbit/s, and set the duplex mode to full duplex. Check whether the interfaces become Up. If they are still Down, contact Huawei technical support engineers.
4.If the two interfaces are both GE interfaces, check whether the auto-negotiation status, rates, and duplex modes on the two interfaces are the same. If they are different, set them to be the same.
5.If the interfaces are still Down, ensure that input optical power on each interface is within the receiver sensibility of the interface.
6.If the problem persists, contact Huawei technical support engineers.

NOTE:
The status of a physical interface is not affected by the service configuration.

Other related questions:
The state of an optical interface is not Up when it interconnects with the peer device
For the problem that the state of an optical interface is not Up when it interconnects with the peer device, see the troubleshooting guide. For details, access the URL in the right column.

Can optical interfaces on CE series switches be connected using a single optical fiber
Optical interfaces on CE series switches in V100R002C00 and later versions can be connected using a single optical fiber.

Can the E1 interface of an AR router interconnect with the Ethernet
The E1 interface of an AR router cannot interconnect with the Ethernet. - E1/T1: E1/T1 is a technology of using the synchronous time division multiplexing technology to combine multiple audio channels into a 2 Mbit/s or 1.5 Mbit/s high-speed channel. It is used in WAN in general. - Ethernet: Ethernet uses the Carrier Sense Multiple Access (CSMA) and Conflict Detection (CD) technologies and runs on cables of multiple types with a speed ranging from 10 Mbit/s to 10 Gbit/s. It is used in LAN in general. As described above, the principles, protocols, and application scenarios of E1 and T1 are different. In addition, E1 or other interface cards equipped with four or eight interfaces use RJ45 interfaces but do not use the Ethernet.

Optical fiber connections of the TN12OAU board
One multiplexed optical signal received at the IN port is sent to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. The signal is then transmitted to the DCM board through the TDC port for dispersion compensation. Then, the signal is sent back through the RDC port. The amplified multiplexed signals are output through the OUT port. The multiplexed signal can also be input through the VI port and output through the VO port after the optical power is adjusted. Then, the IN port receives the multiplexed signal sent from the VO port.

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