Abstract: Exemplary embodiments of the present invention selectively adapt the pad architecture on bi-directional opto-electronic transceiver modules to connect to legacy unidirectional ports, panels and the like. This allows the bi-directional module to function correctly when connected to either a unidirectional or a bi-directional port. Conversely, exemplary embodiments also selectively adapt the pad architecture on bi-directional patch panels or ports to connect to legacy unidirectional optoelectronic transceiver modules. This allows the port to function correctly when either a bi-directional or a unidirectional transceiver is connected to it.

Abstract: This disclosure is concerned with optoelectronic modules. In one example, an optoelectronic transceiver includes a data transmit line coupled to an optical source, and a data receive line coupled to an optical detector. In addition, a serial bus is provided that is distinct from both the data transmit line and the data receive line. A microprocessor is coupled to the serial bus and corresponds to a serial address. Finally, an optical driver of the optoelectronic transceiver is coupled to the optical source, and the microprocessor provides a control signal for adjusting a swing amplitude of the optical driver in accordance with one or more commands received by the microprocessor via the serial communication bus.

Abstract: A cylinder head cover, particularly for covering a cylinder head of an internal combustion engine, having a plurality of functional elements such as an oil filling connection and at least one oil separation device mounted thereon. The cylinder head cover is formed by a bottom shell and a top shell, with the functional elements each being formed from two segments. One segment is integrally arranged on the bottom shell, and the second segment is integrally arranged on the top shell. The two shells are interconnected by communicating sealing contours. Essential functional parts of the oil separation device are provided on the bottom shell and on the top shell. Preferably the functional elements include a cyclone which separates entrained oil from gases in the cylinder head cover and includes a cup arranged on the bottom shell and an immersion tube arranged on the top shell.

Abstract: An EMI shielding mechanism for use with an electronic module, such as an opto-electronic transceiver module, is disclosed. The EMI shielding mechanism includes a plurality of shielding tabs disposed on an outside face of the module. When the module is fully disposed in a port of a host device, the shielding tabs contact an edge of the port, thus reducing the amount of EMI radiation emitted form that edge. The shielding tabs are angled so that when the module is fully disposed in the port, a portion of the shielding tabs is inside the port and a portion is outside of the port. The angled shielding tabs provide a spring force which assists a user to extract the module from the port.

Abstract: This disclosure concerns systems, methods and devices for temperature-based control of laser performance. One example of a method is performed in connection with a laser of an optoelectronic transceiver. In particular, the laser is operated over a range of temperatures and the optical output of the laser is monitored. During operation of the laser, the bias current and current swing supplied to the laser are adjusted to the extent necessary to maintain a substantially constant optical output from the laser over the range of temperatures.

Abstract: This disclosure concerns optical packages such as may be used in optical transceivers and transmitters. In one example, an optical package includes a header assembly having a base portion to which is attached a header structure that is split into first and second portions that are separated from each other by a space. The header structure further includes one or more electrical leads extending through the base portion and into one of the first and second portions of the header structure. An active temperature control device is included in the optical package and resides in the space between the first and second portions of the header structure. Finally, an optical element, such as a laser, is provided that is arranged for thermal communication with the active temperature control device so that operation of the optical element can be controlled by way of the active temperature control device.

Abstract: A compact laser package with integrated temperature control is disclosed. In one embodiment, the compact laser package that includes a housing, a window through the housing, a laser emitter disposed in the housing, and an active temperature control device disposed in the housing. The laser emitter is disposed on the active temperature control device and aligned such that optical signals generated by the laser emitter can be emitted through the window without a waveguide. Additionally, the housing has an outline similar to that of a transistor-can. Temperature measuring device and laser power detection device may also be integrated within the laser package.

Abstract: A method of maintaining desirable optical performance of optical emitters over temperature variations is disclosed. The optical performance of an optical emitter in terms of power, extinction ratio, jitter, mask margin and general fiber optic transmitter eye quality can be maintained by the present invention over a wide range of temperatures. Advantageously, the present invention enables the use of inexpensive optical emitters in optoelectronic transceivers and optoelectronic transmitters.

Abstract: Methods and processes are disclosed for calibrating optoelectronic devices, such as optoelectronic transceivers and optoelectronic receivers, based upon an avalanche photodiode breakdown voltage. In general, the method involves adjusting a reverse-bias voltage of the avalanche photodiode until avalanche breakdown of the avalanche photodiode occurs. An optimized APD reverse-bias voltage is then determined by reducing the reverse-bias voltage at which avalanche breakdown occurs by a predetermined offset voltage. This process is performed at a variety of different temperatures. Information concerning each temperature and the corresponding optimized APD reverse-bias voltage is stored in a memory of the optoelectronic device.

Abstract: Methods and processes are disclosed for calibrating optoelectronic devices, such as optoelectronic transceivers and optoelectronic receivers, based upon a measured avalanche photodiode bit error rate. In general, the method involves measuring a bit error rate for the avalanche photodiode and adjusting the reverse bias voltage of the avalanche photodiode until the bit error rate is minimized. This process is repeated for each of a variety of different thermal conditions. Information concerning each thermal condition and the corresponding reverse bias voltage is stored in a memory of the optoelectronic device.

Abstract: The invention relates to a method for stocking and preserving green round wood and sawn timber, which is stored in an airtight and lighttight sealing cover. The oxygen inside the cover is decomposed by the respiratory process of fungi, bacteria and wood cells that are still alive, thereby forming CO2 and H2O. Fermentation processes also lead to the decomposition of hemicelluloses and saccharides which are converted to organic acids and CO2. The oxygen content in the cover is less than 0.1 vol. % after an adjustment time of 3 to 10 days of total stocking, while said CO2 content rises to more than 21 and up to 40 vol. %. This method enables green round wood a swan timber to be stocked over long periods without wastage or environmental damage.

Abstract: The invention relates to a glass-plastic composite film, especially for use in electronic components and devices, such as displays. The inventive film consists of a glass film which is between 10 &mgr;m and 500 &mgr;m thick, and is characterised in that a polymer layer with a thickness of between 1 &mgr;m and 200 &mgr;m f is applied directly to at least one of the side faces of said film and in that at least one side on the surface of the film has a waviness of less than 100 nm and a roughness RT<30 nm.

Abstract: The invention relates to a network component and to a method for transmitting a signal between a terminal and a network component, the method comprising the steps of:

Abstract: Exemplary embodiments of the present invention selectively adapt the pad architecture on bi-directional opto-electronic transceiver modules to connect to legacy unidirectional ports, panels and the like. This allows the bi-directional module to function correctly when connected to either a unidirectional or a bi-directional port. Conversely, exemplary embodiments also selectively adapt the pad architecture on bi-directional patch panels or ports to connect to legacy unidirectional optoelectronic transceiver modules. This allows the port to function correctly when either a bi-directional or a unidirectional transceiver is connected to it.

Abstract: A method for compensating for wavelength drift in a fiber-optic laser transmitter includes 1) controlling a temperature within the optoelectronic assembly at a defined level; 2) driving the optoelectronic assembly to emit light, wherein the emitted light has a wavelength that is within a channel of operation, the channel of operation including a range of wavelengths centered around a channel center wavelength; 3) accessing from memory within the optoelectronic assembly a control value associated with the temperature of the optoelectronic assembly at defined points within an operational lifetime of the optoelectronic assembly; and 4) recalculating the defined level by reference to the control value, whereby a wavelength of the optoelectronic assembly is maintained within the channel of operation despite an expected drift of wavelength.

Abstract: Bi-directional communications modules are configured for propagating transmission and reception of optical data along each of dual optical cables. The modules generally include: a first transmitter configured for transmitting data on a first wavelength channel onto a first optical fiber; a first receiver configured for receiving data on a second wavelength channel from the first optical fiber; a second transmitter configured for transmitting data on the second wavelength channel onto a second optical fiber; and a second receiver configured for receiving data on the first wavelength channel from the second optical fiber. By changing the use of the dual optical cables from unidirectional traffic to bi-directional traffic, the modules thereby double the data transmission capacity of the cables without changing the size of the cables or transceiver modules or requiring the installation of new cables.

Abstract: A method for calibrating a multi-channel laser emitter in an optoelectronic transceiver or an optoelectronic transmitter for a first wavelength includes monitoring the wavelength of optical signals from the laser emitter while varying its temperature as well as other operating conditions, and then storing calibration information in the memory of a microprocessor. The initial values of the calibrating procedure are reset and the calibrating procedure is repeated to obtain calibration information for a next desired wavelength.

Abstract: A system and method for testing the jitter tolerance and signal attenuation tolerance of an optoelectronic device is disclosed. The system includes a generation circuit, delay circuit and comparison circuitry. A first sequence of bits is generated, delayed, and sent to the optoelectronic device. The optoelectronic device receives the bits and retransmits them as a second sequence to the comparison circuitry, which compares the two bit sequences to determine a bit error rate. The bit error rate is then used to determine the jitter tolerance and, in an alternate embodiment, the signal attenuation tolerance of the optoelectronic device being tested.

Abstract: An apparatus and method are provided for setting the AC and DC bias levels of a laser diode in an optoelectronic transceiver so as to control the device's extinction ratio. An optical output of the transceiver is looped back to an optical input of the transceiver. The method includes setting a DC bias level for the laser diode, setting an AC bias level for the laser diode to each of a predefined sequence of AC bias level settings, and receiving from the transceiver a sequence of optical output power measurements, the sequence of optical output power measurements including an average optical output power measurement corresponding to each of the AC bias level settings in the predefined sequence. From the received sequence of optical output power measurements preferred AC and DC bias level settings are determined and stored in the transceiver so as to control the AC and DC bias levels of the laser diode.

Abstract: An optical transceiver module having a multiplexing analog control interface. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board associated with the module. Transmitting and receiving optical sub-assemblies are also included in the module. A time division multiplexing analog control signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are converted and combined into a multiplexed analog control signal and transmitted via the interface to the integrated post-amplifier/laser driver. After receipt by the integrated post-amplifier/laser driver, the multiplexed analog control signal is divided into discrete analog control signals and forwarded to a plurality of control devices that use the control signals to modify a plurality of operating parameters of the transceiver module.