the plurality of lasers including a laser driver coupled with a plurality of lasers coupled with the splitter to receive the
the splitter and conditioning the laser data signals and laser data signals, the lasers being displaced from one
laser diodes driven by the conditioned laser data sig- another and facing in parallel directions;
nals, respectively, an aperture;
the laser driver including a signal amplifier coupled with 5 a Mangin mirror in lme with the aperture facing in a
the splitter and a DC bias circuit coupled between the parallel direction to the lasers'
signal amplifier and one of the laser diodes, and itJ-j 1 ■ + T><t • • J
, f n , .... , ... a photodiode at the local point oi the Mangin mirror; and the laser driver further including a photodiode, a fiber
optic element sampling the laser diode output and an outPut from the Photodiode.
extending to the photodiode, the signal amplifier being 10 . 21 ■ The portable transceiver of claim 26 further compns
coupled with the photodiode and responsive to the ln8
output of the photodiode. a preamplifier coupled with the photodiode;
22. The portable transceiver of claim 21, the plurality of an automatic gain control coupled with the preamplifier lasers further including lenses receiving the laser outputs, and with the output.
respectively, and collimating the outputs into beams of less 15 28. The portable transceiver of claim 26 further compris
than 1° cone angle each. mg
23. The portable transceiver of claim 21, the laser driver a hemispherical interference filter having a center of including signal amplifiers coupled with the splitter and DC curvature at the focal point of the Mangin mirror, bias circuits coupled between the signal amplifiers and the „„ „, ^ ,, ^ . „ , . „„ ^ , . ,
, ,. , ^. , 29. the portable transceiver oi claim 28, the hemisphen
laser diodes, respectively. 20 , . ^ „ cu , . ^. , „u , . . ,
,, TM ' , , . . j. , . , . j. cal interference falter being an optical falter having a nominal
24. the portable transceiver oi claim 21, there being lour ^ , ^ ^ laser diodes center wavelength oi 1550 nanometers.
3S25. T-Uportable transceiver of claim 21 further compris- 30- The Portable transceiver of claim 29, the hemispheri
jng cal interference filter having a narrow bandwidth of 100
a visual siting scope aligned with the lasers. 25 nanometers
26. A portable transceiver of ethernet signals, comprising 31- The portable transceiver of claim 26, the Mangin
an input for receiving one of the ethernet signals; mirror having an f-number of about 0.67. a splitter coupled with the input to divide the ethernet
signal into laser data signals; *****