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ONET4211LD - can a constant modulation current be output from the driver?

Other Parts Discussed in Thread: ONET4211LD, ONET4201LD

I'm currently working on a project to switch a semiconductor optical amplifier (SOA) on and off very quickly.  The rise and fall times need to be very short - under a nanosecond.  The SOA also needs to have the capability to be kept on indefinitely - the bandwidth required would need to include DC.

SOAs behave broadly like laser diodes, since they are essentially laser diodes without a cavity.  As such, I have been trying to find a suitable laser diode driver.

Most of the drivers I have found so far have required AC coupling on the input and output, which renders DC coupling impossible.  However, the ONET4211LD laser diode driver seems broadly suitable - it allows for DC coupling on the input. 

Unfortunately, I noticed that a lower bitrate limit of 155 Mbps is listed in the title and summary, implying that there is a lower limit on the bandwidth, and therefore that the driver cannot output a constant modulation current.  Is this the case?  There is no mention of bandwidth elsewhere in the datasheet (as far as I can tell).