摘要:
A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room temperature without the need for ambient cooling or hermetic packaging. Since there is large scale integration of N optical transmission signal WDM channels on a TxPIC chip, a new DWDM system approach with novel sensing schemes and adaptive algorithms provides intelligent control of the PIC to optimize its performance and to allow optical transmitter and receiver modules in DWDM systems to operate uncooled. Moreover, the wavelength grid of the on-chip channel laser sources may thermally float within a WDM wavelength band where the individual emission wavelengths of the laser sources are not fixed to wavelength peaks along a standardized wavelength grid but rather may move about with changes in ambient temperature. However, control is maintained such that the channel spectral spacing between channels across multiple signal channels, whether such spacing is periodic or aperiodic, between adjacent laser sources in the thermally floating wavelength grid are maintained in a fixed relationship. Means are then provided at an optical receiver to discover and lock onto floating wavelength grid of transmitted WDM signals and thereafter demultiplex the transmitted WDM signals for OE conversion.
摘要:
A wavelength-selective add-drop multiplexer is disclosed for adding and/or dropping spectral components from a wavelength-division-multiplexed optical signal. (1x1) or (2x2) optical switches are used, either alone or in conjunction with other optical elements, to separate spectral components identified for drop from other spectral components.
摘要:
There is disclosed an optical device for dispersion compensation of channels within a predetermined wavelength band, comprising: a waveguiding structure; and a grating structure formed in said waveguiding structure; characterized in that said grating structure has a Bragg frequency profile that is divided into periods, wherein the Bragg frequencies within each period vary between a lower Bragg frequency and an upper Bragg frequency, said lower and upper Bragg frequencies for each period both corresponding to wavelengths outside of said predetermined wavelength band.
摘要:
An electromagnetic radiation emitter (12) which utilizes a precompensator (14), pulsed light signal, optical fiber cable (18), and a terahertz radiation generator (16). The present invention incorporates an optical precompensator (14) to correct for the stretching of an optical signal as it travels through an optical fiber cable (18). The dispersion characteristics of the precompensator (14) will be equal and opposite to the dispersion characteristics of the optical fiber cable, maintaining the fidelity of optical pulses as they travel through and exit the optical fiber cable (18) striking a device that generates terahertz electromagnetic radiation (16).
摘要:
A dispersion compensation module, which has a function of compensating the wavelength dispersion produced in an optical transmission line and a construction with which the wavelength dependency of its transmission loss is mall and the module is easy to be inserted into an optical transmission system, comprising an input terminal and an output terminal of a signal light, a dispersion compensating means such as a dispersion compensation optical fiber and a loss equalizing means which compensates for a loss variation depending at least upon wavelengths in the dispersion compensating means.
摘要:
The invention relates to an optical module for the wavelength reference measurement. The inventive module is essentially provided with an optical waveguide (7) having an integrated fibre Bragg grating (8) which is provided with a transmission maximum at a desired wavelength. A photodetector (10) for receiving the measuring radiation bundle that has penetrated the fibre Bragg grating (8) is arranged downstream in relation to the fibre Bragg grating (8). A reference radiation bundle can be produced by means of a beam splitter (5) if desired. Said bundle is detected in an additional photodetector (6).