公开(公告)号：JPH05191353A

公开(公告)日：1993-07-30

申请号：JP19741992

申请日：1992-07-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： RITSUKARUDO KARUBAANI ,  RENAATO KAPONI ,  JIYUZETSUPE MAROONE

IPC: G02F2/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/135 ,  H04B10/142 ,  H04B10/152

Abstract: PURPOSE: To constitute a system transmitter or a local oscillator by two sources of light beam by synthesizing orthogonally polarized light beams generated from two independent sources of light beam and with different frequencies each other. CONSTITUTION: Two semiconductor lasers 1, 2 approximated to each other at the most are connected to a binary data flow source 3 and the two lasers 1, 2 are frequency modulated by the flow source 3. Then signals from the flow source 3 are supplied to controllers 4, 5 of the laser 1, 2 and each signal is superimposed on DC exciting voltage VB1, VB2. Each laser is oscillated by the signal with four frequencies corresponding to a logic value of a binary signal. In this case, the linearly polarized light beam generated from the laser 1 is transmitted to a polarized beam splitter 7, light is received on a transmitted surface and the light beam from the laser 2 is received on a reflecting surface. The light beam becomes the orthogonally polarized light beams with different frequencies each other, the light beams are synthesized and transmitted onto a transmission line 12. Then the linear polarization rotating by 360 degrees is obtained and the system transmitter or the local oscillator is constituted.

公开(公告)号：JPH05191352A

公开(公告)日：1993-07-30

申请号：JP19741892

申请日：1992-07-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： RITSUKARUDO KARUBAANI ,  RENAATO KAPONI ,  JIYUZETSUPE MAROONE

IPC: G02F2/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/135 ,  H04B10/142 ,  H04B10/152

Abstract: PURPOSE: To transmit a signal including two orthogonal modulation components with different frequencies for each bit by orthogonally setting polarized state of a light beam radiated from two light sources to correspond to each bit of information signal and synthesizing the polarized state. CONSTITUTION: The light beam radiated from a laser 1 which is the linearly polarized light beam is transmitted to a polarized beam splitter 7. In addition, the light beam transmitted from a laser 2 with a half-wavelength plate 8 is received by a reflecting surface of the splitter 7. Therefore, the light beam is polarized in a surface orthogonally crossed with a light receiving surface of the light beam radiated from the laser 1. In addition, a single light beam obtained by synthesizing two light beams is transmitted to a mode fiber 12 with a lens system 11 by the splitter 7. The light beam extracted from the fiber 12 is paralleled by a lens 13, supplied to a correcting part 14 and the light beam outputted from the fiber 12 ordinarily formed in ellipse is returned to a linearly polarized state. Consequently, the orthogonal polarization components with different frequencies are transmitted on a line for each bit.