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SFP optical module interface and components
Release time：2021-06-17 Reading：0
The rate of optical module SFP+ is: 10G SFP+ optical transceiver is an upgrade of SFP (sometimes called "mini-GBIC"). SFP has been widely used on Gigabit Ethernet and 1G, 2G, and 4G Fibre Channel. In order to adapt to higher data rates, SFP+ has designed electromagnetic shielding and signal maintenance features that are enhanced compared to SFP, and has formulated new electrical interface specifications.
Interface index of SFP optical module
1. Output optical power Output optical power refers to the output optical power of the light source at the transmitting end of the optical module, in dBm.
2. Received optical power Received optical power refers to the received optical power at the receiving end of the optical module, in dBm.
3. Receiving sensitivity Receiving sensitivity refers to the minimum received optical power of an optical module under a certain rate and bit error rate, in dBm. In general, the higher the rate, the worse the receiving sensitivity, that is, the greater the minimum received optical power, and the higher the requirements for the receiving end of the optical module.
4. Saturated optical power, also known as optical saturation, refers to the maximum input optical power when a certain bit error rate (10-10～10-12) is maintained at a certain transmission rate, in dBm.
It should be noted that the photodetector will experience photocurrent saturation under strong light irradiation. When this phenomenon occurs, the detector needs a certain time to recover. At this time, the receiving sensitivity decreases, and the received signal may be misjudged. It can cause bit errors, and it can easily damage the receiver's detector. During operation, it should be avoided to exceed its saturated optical power.
Components of SFP optical module
The composition of the SFP optical module is: laser: including transmitter TOSA and receiver ROSA circuit board IC, external accessories are: shell, base, PCBA, pull ring, buckle, unlocking piece, rubber plug. In addition, for easy identification, Generally, the color of the pull ring is used to identify the parameter type of the module. For example: the black pull ring is a multi-mode module with a wavelength of 850nm; blue is a module with a wavelength of 1310nm; yellow is a module with a wavelength of 1550nm; purple is a module with a wavelength of 1490nm.
Interface index of SFP optical module
1. Output optical power Output optical power refers to the output optical power of the light source at the transmitting end of the optical module, in dBm.
2. Received optical power Received optical power refers to the received optical power at the receiving end of the optical module, in dBm.
3. Receiving sensitivity Receiving sensitivity refers to the minimum received optical power of an optical module under a certain rate and bit error rate, in dBm. In general, the higher the rate, the worse the receiving sensitivity, that is, the greater the minimum received optical power, and the higher the requirements for the receiving end of the optical module.
4. Saturated optical power, also known as optical saturation, refers to the maximum input optical power when a certain bit error rate (10-10～10-12) is maintained at a certain transmission rate, in dBm.
It should be noted that the photodetector will experience photocurrent saturation under strong light irradiation. When this phenomenon occurs, the detector needs a certain time to recover. At this time, the receiving sensitivity decreases, and the received signal may be misjudged. It can cause bit errors, and it can easily damage the receiver's detector. During operation, it should be avoided to exceed its saturated optical power.
Note that for long-distance optical modules, since the average output optical power is generally greater than its saturated optical power, users should pay attention to the length of the optical fiber when using it to ensure that the received optical power is less than the saturated optical power of the optical module, otherwise it may cause The optical module is damaged.
Components of SFP optical module
The composition of the SFP optical module is: laser: including transmitter TOSA and receiver ROSA circuit board IC, external accessories are: shell, base, PCBA, pull ring, buckle, unlocking piece, rubber plug. In addition, for easy identification, Generally, the color of the pull ring is used to identify the parameter type of the module. For example: the black pull ring is a multi-mode module with a wavelength of 850nm; blue is a module with a wavelength of 1310nm; yellow is a module with a wavelength of 1550nm; purple is a module with a wavelength of 1490nm.
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Jason ZHU