Figure 7.3-3: Sfp Transceiver - Moog 903 User Manual

903-0623-00 Rev. A
4. Maintain good optical connections

Ensure connectors are well secured in the bushing and are not side loaded.

Never clamp down on fiber. For example, when securing the fiber to a PCB, do not use a
tight string, clamps or any mechanical mean to tightly bind the fiber. Local stress on the fiber
increases loss and may break the fiber. Hard epoxies should also be avoided when securing
fibers on a PCB.

Never use the fiber to pick up or support the weight of the device to which it is attached.

Follow ESD guidelines for handling electrostatic sensitive devices, such as cards with
electro-optical devices.

SFP optical transceivers typically have a transmit and receive optical bushing (LC type),
which requires dual fiber operation. The transmit side (Tx) and the receiver side (Rx) of an
SFP is shown in Figure 7.3-3.
5. Maintain proper optical power levels
Optical receivers will experience errors if the received optical power is too low. Ensure the total
optical losses of the components in the external cable system (jumpers, cable, connectors, couplers,
FORJ, etc.) are less than the specified optical power budget of the Model 903 system used. A
calibrated optical power meter should be used for any detailed measurements or trouble-shooting.
Optical receivers can also saturate and experience errors if the received optical power is too high,
especially when using high power transceivers. Use a 5 or 10 dB fixed attenuator in line with each
fiber during bench tests or with short, low loss links to ensure a minimum level of attenuation is
present. A variable optical attenuator (VOAT) can also be used for testing. In some high power
systems, receivers can actually be damaged by excessive optical power, so a fixed attenuator is
recommended even with a VOAT.
Focal Technologies Corp.
Model 903 User's Guide, FMB-X-2.5 Version
Tx
Rx
(Optical
(Optical
Output)
Input)

Figure 7.3-3: SFP Transceiver

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