Optical telecommunication device and its mainframe and optical module to the mainframe
A technology of optical modules and hosts, applied in optics, nonlinear optics, optical transmission systems, etc., can solve problems such as signal difficulty, differentiation, and signal quality loss
Active Publication Date: 2021-03-30
LUMENTUM TECH UK LTD
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- Description
- Claims
- Application Information
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Problems solved by technology
However, distortion on the transmit circuit can make the signal more difficult to distinguish from noise introduced on the optical connection, which results in a significant loss of signal quality
Method used
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[0031] The most accurate way to determine the pre-emphasis for an optical transmitter comprising a host and pluggable modules is to calibrate the system when the module is plugged into the host. It is expected that such a calibration scheme can be performed automatically and without the need for additional components. Methods and apparatus for performing such calibration are described below.
[0032] figure 1 A schematic diagram of a communication device including a motherboard 100 and a pluggable optical module 200 is shown. The host board 100 includes a DAC or other signal generator 101, a host interface 102 communicating with the pluggable optical module 200 through a connector 250, and a host calibration unit 103 that controls the calibration process.
[0033] The pluggable optical module 200 includes a module interface 201 that communicates with the host 100 through the connector 250, a modulator 202 that controls the modulation of the laser signal output by the communi...
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An optical communications apparatus comprising a host (100) and an optical module (200) comprising a Mach-Zehnder modulator (202), MZM, wherein the optical module is removably connected to the host via a connection path, the optical communications apparatus comprising: a signal generator (101) at the host, configured to generate a plurality of calibration signals at a plurality of frequencies; a host interface (102) configured to transmit the calibration signals to the optical module via the connection path; a module interface (201) configured to receive the transmitted calibration signals; wherein the MZM is configured to use the calibration signals to modulate a laser light source (206) and biased to a point at which average output power is proportional to the output modulated signal; an optical detector configured to measure an average magnitude of an output of the MZM when each of the calibration signals is used to modulate the laser light source; one of a host calibration unit (103) and a module calibration unit (203), configured to determine a magnitude response of the connection path based on the measured average magnitudes and magnitudes of the respective calibration signals, and further configured to determine a pre-emphasis characteristic based on the magnitude response, the pre-emphasis characteristic for application to signals transmitted by the optical transmitter in use.
Description
technical field [0001] The present invention relates to methods and devices for calibration of optical transmitters. An optical transmitter may include a pluggable optical module and a host device to which the pluggable module is connected, and in particular relates to methods and apparatus for automatic self-calibration of the module and the host. Background technique [0002] Communication devices are increasingly using pluggable modules that plug into the host via a connector, which may be an optical connector. Some components of the communication device can be on the pluggable module, and other components can be on the host, and the communication between the components on the host and the components on the module can be realized through the connector. The optics for the system are located on a pluggable module (along with some electronic control circuitry), and the rest of the device components (such as electronic signal processing) can be located on the host computer. ...
Claims
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IPC IPC(8): H04B10/50H04B10/588G02F1/225
CPCG02F1/225H04B10/50572H04B10/588G02F1/21H04B10/0779H04B10/54G02F1/212H04B10/07955H04B10/5057H04B10/50575H04B10/564H04B2210/254
Inventor R·格瑞芬
Owner LUMENTUM TECH UK LTD