公开(公告)号：WO0041351A3

公开(公告)日：2000-11-09

申请号：PCT/FI9901087

申请日：1999-12-28

Applicant: NOKIA NETWORKS OY ,  SALOMAA ARI

Inventor： SALOMAA ARI

IPC: H04B10/00 ,  H04B10/02 ,  H04B10/079 ,  H04B10/08 ,  H04J14/02 ,  G02B6/293

CPC classification number: H04J14/02 ,  H04B10/07955 ,  H04B10/07957

Abstract: Individual wavelengths ( lambda 1, lambda 2, lambda 3,.. lambda N) of a multicomponent light wave travelling in an optical fibre are monitored in such a way that e.g. a coupler (31) is used to separate aside from the power of the light wave a small part, which is conducted into a narrowband tuneable optical filter (32). The filter tuning signal is used for controlling the filter (32) in such a way that the wavelength window formed by its pass band will scan the entire wavelength range to be examined. The narrowband optical signal obtained from the filter is conducted to a light detector (33), which converts the optical signal into an electric signal. As the window of the tuneable filter scans through the wavelength band, such an electric signal is obtained as a wavelength function which is proportional to the power of the optical signal and the peak points of which are located at the wavelength of each channel. Based on the control signal and the peak points, the control electronics circuit (34) determines the individual wavelengths of the multicomponent light wave.

Abstract translation: 监视在光纤中行进的多组分光波的各个波长（λ1，λ2，λ3，...λN） 耦合器（31）用于将光传输到窄带可调谐滤光器（32）中的小部分分离出光波的一部分。 滤波器调谐信号用于控制滤波器（32），使得由其通带形成的波长窗口将扫描待检查的整个波长范围。 从滤波器获得的窄带光信号被传送到光检测器（33），该光检测器将光信号转换成电信号。 当可调滤波器的窗口通过波长带扫描时，获得这样的电信号作为与光信号的功率成比例的波长函数，其峰值点位于每个通道的波长处。 基于控制信号和峰值点，控制电子电路（34）确定多组分光波的各波长。

公开(公告)号：WO0041349A3

公开(公告)日：2000-11-09

申请号：PCT/FI9901017

申请日：1999-12-08

Applicant: NOKIA NETWORKS OY ,  SALOMAA ARI

Inventor： SALOMAA ARI

IPC: H01S5/024 ,  H01S5/06 ,  H01S5/062 ,  H01S5/068 ,  H04B10/50 ,  H04B10/564 ,  H04B10/572 ,  H04J14/02

CPC classification number: H04B10/564 ,  H01S5/02415 ,  H01S5/0612 ,  H01S5/0622 ,  H01S5/06804 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

Abstract: The invention is based on the idea that wavelength of a laser transmitter in a WDM system can be changed in a controlled fashion by inducing an accurately pre-defined change in the cooler control current TEC. This, in turn, effects a controlled change in the heating or cooling operation of the cooler. As a result, a predetermined change takes place in the wavelength of the light generated by the laser. The temperature control circuit ensures that the laser temperature and, thus, wavelength, are maintained exactly at the new value. For each desired wavelength, a parameter set consisting of a pre-set laser temperature value, a laser power value and laser modulation bias values has been saved in storage in advance. When the laser wavelength is to be changed, the parameter values corresponding to the wavelength are retrieved from the storage and fed to the laser. Retrieval and feeding can be pre-programmed or carried out manually.

Abstract translation: 本发明基于以下思想：WDM系统中的激光发射器的波长可以通过引导冷却器控制电流TEC中的精确预定义的变化而以受控的方式改变。 这反过来又影响到冷却器的加热或冷却操作的受控变化。 结果，在由激光产生的光的波长中发生预定的变化。 温度控制电路确保激光器的温度，因此保持波长，准确地保持在新的值。 对于每个期望的波长，预先存储了由预设的激光温度值，激光功率值和激光调制偏置值组成的参数集。 当要改变激光波长时，从存储器中取出对应于波长的参数值并将其馈送到激光器。 检测和进给可以手动预编程或执行。

公开(公告)号：WO0041350A2

公开(公告)日：2000-07-13

申请号：PCT/FI9901071

申请日：1999-12-22

Applicant: NOKIA NETWORKS OY ,  SALOMAA ARI ,  HIIRONEN OLLI PEKKA

Inventor： SALOMAA ARI ,  HIIRONEN OLLI-PEKKA

IPC: H04J14/02

CPC classification number: H04J14/02 ,  H04J14/0201

Abstract: In the transmitting node (51) of an optical transmission system using wavelength multiplexing and including several channels (channel 1, channel 2, channel 3, channel 4) the information content of each channel is transmitted onto its own wavelength ( lambda 1, lambda 2, lambda 3, lambda 4) by modulating the laser transmitter producing the wavelength in question. The obtained optical signals are combined onto the same optical fibre. In the receiving node (52) the sum signal is separated into different wavelengths by using a wavelength-selective optical separation component (522), whereby a predetermined wavelength and thus a channel is obtained from each output port of the separation component. In accordance with the invention, instead of using optical or electrical cross-connectors for re-routing a certain signal content to another destination, that transmission wavelength on which the signal content is transmitted is in fact changed at the signal transmission end. Since the components of the transmission network are wavelength-selective, no changes need be made in the components, yet they transmit the old wavelength in accordance with the earlier routing plan to the same destination as before, but the signal content transported in the wave has in fact been exchanged for another.

Abstract translation: 在使用波长多路复用并且包括多个信道（信道1，信道2，信道3，信道4）的光传输系统的发射节点（51）中，每个信道的信息内容被发送到其自己的波长（λ1，λ2 ，λ3，λ4）通过调制激光发射器产生所讨论的波长。 所获得的光信号被组合到相同的光纤上。 在接收节点（52）中，通过使用波长选择性光学分离组件（522）将和信号分离成不同的波长，由此从分离组件的每个输出端口获得预定波长并因此获得信道。 根据本发明，代替使用光学或电气交叉连接器来将特定信号内容重新路由到另一个目的地，信号内容在其上传输的传输波长事实上在信号传输端处改变。 由于传输网络的组件是波长选择性的，所以不需要对组件进行改变，而是按照早先的路由选择计划将旧的波长传送到与之前相同的目的地，但是在波中传送的信号内容具有 事实上已经换了另一个。

公开(公告)号：WO0022766A8

公开(公告)日：2000-07-13

申请号：PCT/FI9900692

申请日：1999-08-23

Applicant: NOKIA NETWORKS OY ,  SALOMAA ARI ,  RISTIMAEKI HEMMO

Inventor： SALOMAA ARI ,  RISTIMAEKI HEMMO

IPC: H01S5/024 ,  H01S5/068 ,  H04J14/02 ,  H01S5/0687

CPC classification number: H01S5/02415 ,  H01S5/06804

Abstract: The wavelength generated by lasers used in WDM systems exhibits a dependence on ambient temperature. This is because the thermal connection between the laser and the thermistor that monitors the laser temperature is not ideal. In prior-art solutions, the laser stability problem is resolved by incorporating components that stabilise wavelength in the laser module. In the present invention, non-idealness is compensated by using an external compensation circuit to change the thermistor temperature setting a. Compensation can be provided in the form of full compensation or over-compensation. Compensation can be effected by means of a control loop feedback that causes the control signal from the control circuit to the cooling element to have such an effect on the control circuit input that when the ambient temperature changes, the control signal from the control circuit is restricted, so that the laser temperature and, thus, wavelength, remain at the rated values. Compensation can also be provided by making the reference input of the comparison means included in the control loop responsive to the ambient temperature.

Abstract translation: 用于WDM系统的激光器产生的波长表现出对环境温度的依赖性。 这是因为激光器和监测激光器温度的热敏电阻之间的热连接并不理想。 在现有技术的解决方案中，激光稳定性问题通过将稳定波长的组件解决在激光模块中来解决。 在本发明中，通过使用外部补偿电路来改变热敏电阻温度设定α来补偿非理想性。 补偿可以全额赔偿或过度补偿的形式提供。 补偿可以通过控制回路反馈来实现，该控制回路反馈引起控制电路到冷却元件的控制信号对控制电路输入具有这样的影响，即当环境温度改变时，来自控制电路的控制信号受到限制 ，因此激光器温度和波长保持在额定值。 补偿也可以通过响应于环境温度使控制回路中包括的比较装置的参考输入来提供。