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Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICs)

一种光子集成电路、光学功率的技术，应用在信号通道,个功率值领域

Active Publication Date: 2012-03-21
INFINERA CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While beneficial for increased reliability and reduced cost, this integrated multiplexing function poses challenges for controlling individual optical wavelengths and channel average power, since the optically multiplexed signal must be derived from the output of the TxPIC Extract the information needed to control individual channel power and wavelength from

Method used

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  • Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICs)
  • Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICs)
  • Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICs)

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Embodiment Construction

[0029] exist figure 1 Among them, the transmitter photonic integrated circuit (TxPIC) 10 can be a semiconductor circuit chip and includes a plurality of integrated signal channels 15, wherein each channel includes a post photodetector (PD) 12, a semiconductor laser 14 (DFB laser or DBR laser), an electro-optic modulator (EOM) 16 (shown here as an electro-absorption modulator or EAM, but could also be, for example, a Mach-Zehnder modulator), and a pre-PIN 18, which are strung in a row along each channel . We refer to the signal channel combination of laser 14 and electro-optic modulator 16 as channel modulated source. Another type of modulated source that may be used in channel 15 of TxPIC 10 is a directly modulated laser, where the need for an external modulator 16 in each channel 11 is naturally eliminated. In the TxPIC 10 there is thus a signal channel 15 with N lasers 14 of different optical carrier frequencies or emission wavelengths, which operate along a uniform freque...

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Abstract

A transmissive active channel element is provided in each signal channel of a monolithic multi-channel TxPIC where each channel also includes a modulated source. The active channel element functions both as a power control element for both monitoring and regulating the output channel signal level of each signal channel and as a modulator for channel wavelength tagging or labeling to provide for wavelength locking the modulated sources. The power regulating function is also employed to control the channel signal power outputs of each channel to be uniform across the channel signal array. All of these functions are carried out by a feedback loop utilizing digital signal processing.

Description

Background technique [0001] The present invention relates to wavelength locking and output power control systems associated with multiple WDM signal channels, and more particularly in, for example, monolithic Transmitter Photonic Integrated Circuit (TxPIC) chips having multiple integrated signal channels each with a modulated source Available signal channels. [0002] Various feedback loop systems are known for controlling the wavelength of laser arrays, especially discrete lasers or EMLs employed in optical transmitters used in optical transmission networks. Also, there are feedback loop systems used to control the output level of the modulated signal generated in such transmitters so that its power level is consistent across the array of signal path generators. This power equalization is also called pre-emphasis in the prior art. A feature of a monolithic TxPIC with an integrated multiplexer is that the light emerging from the TxPIC has multiple data-modulated optical wave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12H04B10/12H04B10/50H04B10/564H04B10/572
CPCH04B10/572H04B10/564H04B10/506H04J14/0221H04J14/02
Inventor A·C·尼尔森R·W·史密斯Y·卡甘P·N·弗利曼
Owner INFINERA CORP
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