Assembling an electronic demultiplexer is not a difficult task for educated electronic engineer. If currents are not too high, you can even find an analog IC that will do it. Probably such ready device can be even bought. But you have to clarify a few questions before:

- why you do not want to have several drivers?

- do laser diodes have the same parameters and working currents?

- if not, how fast can you readjust the operating mode of driver?

- did you check the switching time of laser diode? how fast they achieve their working mode? Some LDs have essential transient effects.

To my opinion, Doc. Sh.Nizamov provides You very right advices, questions and douts. It is not laser physics  problem, it is task for electronic engenering. I have discovered some patents devoting the  problem and  no ready commertial solutions. In the principle it is  plain that solution must be following: between driver and your diode laser  must be set an electronic commutator which connect them in turn and with reasonable frequency. As controlled electronic key one can use  thyristors and some type of transistors in corresponding electronic scheme.

 One of patents (summery)  with referencese I provide for You for more deeper undestanding with details:

From www.sumobrain.com .

TWO-WIRE DIMMER SWITCH FOR LOW-POWER LOADS

A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

So I wish any succses in the solution!

These don't reach 10kHz according to the spec, but maybe there are other manufacturers that can achieve what you want and with more ports (if you're able to fibre couple).

https://www.thorlabs.hk/newgrouppage9.cfm?objectgroup_id=950

(Optical Switch Kits) (I don't work for Thorlabs)

Dear all,

Thanks for your reply.More information about my application is like these.I am planing to use 2 or more DFB laser diodes as probe light for trace detecting real time, different DFB are emitting different wavelength, which is located in some special absorption peak of each trace, so it's useful to switch these LD in turn in some repetiton rates, at last we could obtain the real time signal of several kind of traces in the same repetition.

Thanks a lot !