Title:
【発明の名称】周波数偏移変調方式光送信機の出力デ-タ信号中の構成信号周波数間隔を制御する装置及び方法
Document Type and Number:
Japanese Patent JPH0710056
Kind Code:
B2
Abstract:
Apparatus and method are disclosed for controlling the tone spacing (2 omega d) and output power level in an FSK lightwave transmitter (12). An arrangement (22) is utilized which splits a tapped-off portion S(t) of the output data stream X(t) into two essentially equal components (S1,S2). A first component (S1) is then delayed and scrambled (polarization state) (by 24,28,29) with respect to the second component (S2). Self-heterodyning of the two signals results in forming a signal V(t) at the beat frequency, or tone spacing value. By comparing this beat frequency with a predetermined tone spacing value, omega ts, adjustments may be made to the transmitter to maintain the desired tone spacing value. The self-heterodyned signal will also contain a component indicative of the data signal power level and may be utilized to adjust the transmitting device so as to maintain a constant power.
Inventors:
Riandi Tseng
Application Number:
JP41010690A
Publication Date:
February 01, 1995
Filing Date:
December 13, 1990
Export Citation:
Assignee:
AT&T CORP.
International Classes:
G02F1/00; G02F2/00; H04B10/04; H04B10/06; H04B10/135; H04B10/14; H04B10/142; H04B10/152; H04L27/12; (IPC1-7): H04B10/14; H04B10/04; H04B10/06; H04B10/142; H04B10/152
Domestic Patent References:
| JP241043A |
Attorney, Agent or Firm:
Hirofumi Mimata (1 person outside)
Next Patent: HUB GENERATOR FOR BICYCLE