公开(公告)号：EP0898389A3

公开(公告)日：2003-11-05

申请号：EP98115815.7

申请日：1998-08-21

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： Fuse, Masaru ,  Ohya, Jun

IPC分类号： H04B10/155 ,  H04B10/158

CPC分类号： H04B10/676 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/5053 ,  H04B10/69

摘要： An angle modulating portion 1 converts an inputted electrical signal into a predetermined angle-modulated signal. An optical modulating portion 2 converts the angle-modulated signal outputted from the angle modulating portion 1 into an optical-modulated signal and sends the optical-modulated signal to an optical waveguide portion 3. An interference portion 6 separates the optical-modulated signal transmitted through the optical waveguide portion 3 into two optical signals having predetermined difference in propagation delay and then combines the optical signals. An optical/electrical converting portion 4 subjects the combined optical signal to homodyne detection, to acquire a demodulated signal of the original electrical signal and output the electrical signal. That is, the interference portion 6 and the optical/electrical converting portion 4 constitute a delayed detection system of an optical signal, so that the delayed detection system performs conversion processing of an optical signal into an electrical signal and angle demodulation processing simultaneously. In this way, a signal with a wide-band and a high-frequency can be acquired by demodulation without electrical part for wide-bands and high-frequencies.

公开(公告)号：EP0491209B1

公开(公告)日：2001-09-19

申请号：EP91120624.1

申请日：1991-11-30

申请人： ALCATEL

发明人： Wedding, Berthold, Dr.

IPC分类号： H04B14/02 ,  H04B10/14

CPC分类号： H04B14/023 ,  H04B10/504 ,  H04B10/676

公开(公告)号：EP1056230A2

公开(公告)日：2000-11-29

申请号：EP00110951.1

申请日：2000-05-25

申请人： TRW Inc.

发明人： Rollins, David L.

IPC分类号： H04B10/158

CPC分类号： H04B10/69 ,  H04B10/67 ,  H04B10/676

摘要： A demodulation system (12) used in connection with an analog optical link (14) that provides a wide dynamic range and SNR potential for large RF signal bandwidths. An optical carrier signal modulated with an RF signal is applied to an optical splitter (30) in the demodulation system (12) that splits the signal into first and second carrier signals. One of the carrier signals is applied to a coarse demodulator (34) that provides either PM or FM demodulation to generate a demodulated signal representative of the signal that includes the RF signal and the additive inverse of an error signal. The error signal includes the theoretical minimum noise floor, as well as excess noise and distortion introduced by the coarse demodulator when the frequency or phase deviation is large. The output from the coarse demodulator (34) is inverted, and integrated in the FM case, and then applied to a phase modulator (56) along with the second optical carrier signal from the optical splitter (30). The phase modulator (56) modulates the optical carrier signal with the additive inverse of the demodulated signal from the coarse demodulator (34) so that the portion of the RF signal occurring in both the optical carrier signal and the demodulated signal are cancelled, and the optical carrier signal is modulated with the error signal. The modulated carrier signal, which now has a small frequency or phase deviation, is applied to a fine demodulator (60) that demodulates the signal to generate the error signal. The error signal and the demodulated signal from the coarse demodulator (34) are then combined, and what remains is a substantial copy of the RF signal with minimal excess noise and distortion. Unbalanced Mach-Zehnder interferometers (32, 62) and photodetectors (36, 38, 64, 66) can be provided in the coarse demodulator (34) and the fine demodulator (60) to provide the demodulation.

摘要翻译： 一种与模拟光链路（14）结合使用的解调系统（12），其为大的RF信号带宽提供宽的动态范围和SNR潜力。 用RF信号调制的光载波信号被施加到解调系统（12）中的光分路器（30），其将信号分离成第一和第二载波信号。 载波信号中的一个被施加到提供PM或FM解调的粗略解调器（34），以产生代表包括RF信号和误差信号的加法逆的信号的解调信号。 误差信号包括理论最小噪声底限，以及当频率或相位偏差较大时由粗略解调器引入的过多噪声和失真。 粗解调器（34）的输出反相，并集成在FM外壳中，然后与来自分光器（30）的第二光载波信号一起施加到相位调制器（56）。 相位调制器（56）利用来自粗略解调器（34）的解调信号的相加逆调制光载波信号，使得在光载波信号和解调信号中发生的RF信号的部分被消除，并且 光载波信号用误差信号进行调制。 现在具有小的频率或相位偏差的调制载波信号被施加到解调信号以产生误差信号的精细解调器（60）。 然后组合来自粗略解调器（34）的误差信号和解调信号，剩下的是RF信号的基本副本，具有最小的过多噪声和失真。 可以在粗解调器（34）和精细解调器（60）中提供不平衡的马赫 - 策德尔干涉仪（32,62）和光电检测器（36,38,64,66）以提供解调。

公开(公告)号：EP0595140A1

公开(公告)日：1994-05-04

申请号：EP93116750.6

申请日：1993-10-16

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Huber, David R.

IPC分类号： H04B10/14

CPC分类号： H04B10/676 ,  G02F2203/19

摘要： An unbalanced Mach Zehnder optical frequency discriminator (20) is linearized to suppress third order nonlinear distortion. An optical carrier that is modulated in optical frequency is input to an unbalanced Mach Zehnder interferometer (20) to discriminate RF information signals carried on the carrier. The Mach Zehnder interferometer has an adjustable operating point. The operating point is adjusted to a point where the output intensity of the Mach Zehnder interferometer (20) is no more than about ten percent of its maximum value. In order to avoid problems with second order distortion, the optical carrier is modulated with RF signals that do not occupy more than a single octave. The operating point of the device can be adjusted by adjusting an electrical bias thereof (28), by adjusting the wavelength of the optical carrier (27), or by adjusting the temperature of the device (25, 29).

摘要翻译： 马赫曾德光学鉴频器（20）的不平衡线性化，以抑制三阶非线性失真。 将以光频率调制的光载波输入到不平衡的马赫策德尔干涉仪（20），以区分载波上携带的RF信息信号。 马赫曾德尔干涉仪具有可调节的工作点。 操作点被调整到马赫策德干涉仪（20）的输出强度不超过其最大值的百分之十的点。 为了避免二阶失真的问题，光载波用不超过单个八度的RF信号进行调制。 可以通过调整光学载体（27）的波长，或通过调节装置（25,29）的温度来调节装置的工作点来调节其偏压（28）。

公开(公告)号：EP0337796A2

公开(公告)日：1989-10-18

申请号：EP89303703.6

申请日：1989-04-14

申请人： Nippon Telegraph and Telephone Corporation

发明人： Iwashita, Katsushi

IPC分类号： G01J9/02 ,  H04B10/00 ,  G02F2/02

CPC分类号： H04B10/69 ,  G01J9/02 ,  G01J2009/0226 ,  G02F2/00 ,  H04B10/676

摘要： A frequency-modulated light signal is introduced into an input 12 of a Mach-Zehnder interferometer 1. The light signals at the outputs 17 and 18 are converted into electrical signals and subtracted, giving an output signal in which the effect of the frequency-modulation is not over­whelmed by the effect of amplitude-modulation of the input signal.

摘要翻译： 频率调制的光信号被引入到马赫 - 策德尔干涉仪1的输入端12中。输出17和18处的光信号被转换成电信号并被减去，给出一个输出信号，其中调频 不被输入信号的幅度调制的影响所淹没。