-
公开(公告)号：US3576502A
公开(公告)日：1971-04-27
申请号：US3576502D
申请日：1968-05-13
Applicant: BELL TELEPHONE LABOR INC
Inventor： JHONSTON WILBUR D JR , LI TINGYE , SMITH PETER W
CPC classification number: H01S3/10092 , H01S3/0064 , H01S3/08045 , H01S3/0805
Abstract: Transverse mode switching is accomplished in a laser oscillating in at least one transverse mode by the injection therein of a low level seeding signal of the desired output mode. If the laser is designed to enhance transverse mode competition (i.e., the cavity geometry approaches either a concentric or plane parallel configuration), then a seeding signal of the correct frequency will cause the laser to switch (i.e., spatially lock) to oscillation entirely in the injected mode. In addition, if the cavity resonator is frequency degenerate at the frequency of a complex (i.e., many transverse modes) input signal, and if the resonator is designed to provide approximately equal gain for all of these transverse modes, then the laser will lock onto the transverse modes of the input signal and image-amplify the signal.
-
公开(公告)号：US3461453A
公开(公告)日：1969-08-12
申请号：US3461453D
申请日：1967-08-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： LI TINGYE
CPC classification number: H01Q19/132 , H01Q13/025
-
公开(公告)号：US3626333A
公开(公告)日：1971-12-07
申请号：US3626333D
申请日：1969-09-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： LI TINGYE
CPC classification number: H03H9/46 , H04L25/03019 , H04L25/03038
Abstract: An automatic equalizer employing n controlled waveform generators each of which uses a bulk semiconductor device having a series of contacts bonded to the surface with resistors, connected between the contacts. Each such generator has a domain nucleated in the semiconductor device at 1/nth the clock rate and the filtered output of one of the generators is connected to an output terminal when the digital input signal received over the transmission system in a pulse. The result is that pulses are distorted over n slots so as to minimize intersymbol interference when the pulses are transmitted over a distorting transmission channel. In a preferred embodiment of the invention the resistors connected between the contacts are photoconductors so that an adjusting signal driving a light source may rapidly change the values of the resistors and thereby adjust the equalizer.
-
-
-
Search Results
4
records
(took 0.013 seconds)
