OPTICAL ARRANGEMENT

Description

[0001] The present application claims the benefit of and priority to European Patent Application EP 20 211 848.5 filed on December 04, 2020.

[0002] The present invention relates to optical assemblies, sets of optical components for fabricating optical assemblies, and methods of fabricating optical assemblies.Background of the invention

[0003] Optical assemblies comprising lasers, transceivers, and interface modules are for instance described in the international patent application WO 2020 / 083845 A1.

[0004] US Patent Application Publication US 2019 / 129112 A1 discloses a laser module system and a pluggable laser module for an optical telecommunications switching apparatus. The laser module system for use with an optical telecommunications apparatus has a laser module having first and second ferrules, a first harness with first optical waveguides that optically connect the first ferrule to the second ferrule, a laser assembly that generates laser light beams having different wavelengths, and a second harness with second optical waveguides that optically connect the laser assembly to the second ferrule. A third harness with third optical waveguides resides within the apparatus. An O-E adapter also resides within the apparatus. The O-E adapter receives the second and third ferrules and places the first and second optical waveguides of the first and second harnesses in optical communication with the third optical waveguides of the third harness. The laser module can be plugged into and unplugged from the receptacle.

[0005] US Patent US 6,769,812 B1 describes a method and apparatus for forming an optical module with optical and electrical connections facing one direction. An optical module includes a body having a proximal end and a distal end, a first optical connector disposed on the body to face the proximal end of the body, a first shelf extending from the body, and a first electrical connector disposed on the first shelf to face the proximal end of the body. Additional optical and electrical connectors and shelves may be included. The optical and electrical connectors may be disposed on the body of the optical connector at different distances from the proximal end of the body to enable electrical signals and optical signals to be transferred from / to the optical module in different physical regions. The optical connector(s) may mate with a receptor in a connector plane, may be positioned adjacent an aperture in a connector plane to receive a mating connector through the aperture, or may extend through the aperture to receive a mating connector.

[0006] US Patent Application Publication US 2009 / 016685 A1 discloses a reconfiguration and protocol adaptation of optoelectronic modules and network components. An optoelectronic module for converting and coupling an information-containing electrical signal with an optical fiber including a housing having an electrical input for coupling with an external cable information system device and for transmitting and receiving information-containing electrical signals over such input, and a fiber optic connector adapted for coupling with an external optical fiber for transmitting and receiving an optical signal; an electro-optic subassembly coupled to the information containing electrical signal and converting it to and / or from a modulated optical signal corresponding to the electrical signal; means disposed in the housing for determining the electrical and / or optical protocols or packet formats in use; and a processor for adapting the module to utilize the electrical and optical protocol or packet format.Objective of the present invention

[0007] An objective of the present invention is to propose an optical assembly that can be easily adopted to different customer demands.

[0008] A further objective of the present invention is to propose a method of fabricating optical assemblies in compliance with different customer demands.Brief summary of the invention

[0009] An exemplary embodiment of the present invention relates to a method according to claim 1.

[0010] An advantage of the latter embodiment is that the optical assembly can be used in different technical environments. For instance, laser modules which generate optical radiation with a single wavelength can be easily replaced by other laser modules which generate radiation with different wavelengths, or vice versa. Appropriate interface modules can be assigned to the chosen laser modules by simply replacing existing interface modules, and vice versa. The hardware of the base module may remain the same or be even completely unaffected.

[0011] Preferably, the transceiver of the base module is connected to the first pluggable interface of the base module via a first fiber bundle.

[0012] Preferably, the transceiver of the base module is connected to the second pluggable interface of the base module via a second fiber bundle.

[0013] Preferably, the laser module comprises eight lasers.

[0014] Preferably, the first fiber bundle comprises eight fibers.

[0015] Preferably, the lasers of the laser module generate radiation of the same wavelengths. Alternatively, the lasers of the laser module may generate radiation with at least two different wavelengths.

[0016] The lasers of the laser module may generate radiation having four different wavelengths. In the latter case, two lasers preferably generate radiation having the same wavelength, respectively.

[0017] Preferably, the laser module has an optical interface and an electrical interface. The electrical interface may be used to supply electrical power and electrical control signals.

[0018] Preferable, the type of the laser module can be reported via the electrical interface.

[0019] Preferable, the characteristics of the laser module can be software-controlled via the electrical interface.

[0020] Preferable, the current characteristics of the laser module can be reported via the electrical interface.

[0021] Preferable, an electrical control unit is connected to the electrical interface of the laser module, the electrical interface of the input-output module and the base module that comprises the transceiver modules as well as preferably other elements of the assembly.

[0022] Preferable, the input-output module comprises 64 fibers connected to a pluggable internal interface. Such an interface may be connected to the second fiber bundle of the base module which may comprise 64 fibers.

[0023] Preferable, the input-output module also comprises - in addition to its pluggable interface which is hereinafter also referred to as internal optical interface - a second optical interface, hereinafter also referred to as external optical interface. The external optical interface is preferably terminated by one or more pluggable optical connectors.

[0024] The external optical interface may be located on the housing of the input-output module. The external optical interface is preferably located on one side of the housing. The pluggable interface (the internal optical interface) is preferably located at the opposite side of the housing.

[0025] Alternatively, the external optical interface may terminate one or more fiber bundles, which are connected to the input-output module.

[0026] The input-output module may comprise 8 fiber bundles with 8 pluggable optical connectors as the second optical interface.

[0027] Preferable, one type of the input-output module, saying type 1, comprises optical multiplexer elements and optical demultiplexer elements for the optical output signal and the optical input signal, respectively.

[0028] Preferable, the optical multiplexer multiplexes four wavelengths guided in four different fibers at the internal optical interface to a single fiber, which guides the four different wavelengths to the external interface of the input-output module.

[0029] The optical demultiplexer preferably demultiplexes four wavelengths guided in a single fiber at the external optical interface to four different fibers, which guide the four different wavelengths to the internal interface of the input-output module.

[0030] Preferable, an input-output module type 1 comprises optical multiplexer and demultiplexer comprising 8 fiber bundles with 2 fibers per bundle, respectively.

[0031] Preferable, another type of input-output module, saying type 2, comprises only fibers, which guide the light directly from the internal optical interface to the external optical interface and visa versa.

[0032] Preferable, a type 2 input-output module comprises 8 fiber bundles with 8 fibers per bundle, respectively.

[0033] Preferably, the input-output module has an internal optical interface and an internal electrical interface. The electrical interface may be used to supply electrical power and electrical control signals.

[0034] Preferable, the characteristics of the input-output module can be software controlled via the electrical interface.

[0035] Preferable, the type of the input-output module can be reported via the electrical interface.

[0036] Preferable, the current characteristics of the input-output module can be reported via the electrical interface.

[0037] The invention also relates to a set of optical components according to claim 4 for fabricating an optical assembly.Brief description of the drawings

[0038] In order that the manner, in which the above-recited and other advantages of the invention are obtained, will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof, which are illustrated in the appended figures. Understanding that these figures depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail by the use of the accompanying drawings in which Figure 1shows an exemplary embodiment of an optical assembly that comprises a network switch assembly that forms a base module which is configurable by pluggable optical input-output modules and pluggable laser modules, Figure 2shows the exemplary embodiment of Figure 1 after the network switch assembly has been equipped with two optical input-output modules and two laser modules, Figure 3shows an exemplary front plate of a network switch assembly with sixteen optical input-output module cages and sixteen laser module cages, Figure 4shows different types of laser modules that may be plugged in the front plate to configure the network switch assembly, Figure 5shows different types of input-output modules that may be plugged in the front plate to configure the network switch assembly, and Figure 6shows an input-output modules that comprises eight fiber bundles and eight connectors at the external optical interface. Detailed description of the preferred embodiments

[0039] The preferred embodiments of the present invention will be best understood by reference to the drawings, wherein identical or comparable parts are designated by the same reference signs throughout.

[0040] It will be readily understood that the parameters of the embodiments of the present invention, as generally described herein, could vary in a wide range. Thus, the following more detailed description of exemplary embodiments of the present invention, is not intended to limit the scope of the invention but is merely representative of presently preferred embodiments of the invention.

[0041] The description of Figures 1-6 refers to the following reference numerals: 1:Laser module 1a:4 λ laser module with: 8 laser diodes; 2 laser diodes per λ, temperature control element, 1 fiber coupling element / laser diode, optical power control, option ID 1b:Single λ laser module with: 8 laser diodes, e.g 1310nm, Temperature control element, 1 fiber coupling element / laser diode, optical power control, option ID 1c:Multi-optional laser module with: 8 laser diodes with tuneable wavelengths, temperature control elements, 1 fiber coupling element per laser diode, optical power controls, module option ID 2:Subunit 3:First fiber bundle 4:Second fiber bundle 5:Optical input-output module 5a:Optical input-output module that supports parallel option 5b:Optical input-output module that supports multiplexed option 5c:Optical input-output module that supports multiple options 6a:Pluggable interface of the laser module 6b:Pluggable internal interface of the input-output module 7a:First pluggable interface of the base module provided by a laser module cage 7b:Second pluggable interface of the base module provided by an input-output module cage 8:Switch assembly front plate 9:Fiber bundle of the input-output module 10:Switch ASIC 100:Transceiver module 11:Switch high-speed substrate 12:Control unit 13:Control interface 14:Network switch assembly (base module) 20:Multiplexed optical signal, e.g. FR4 standard compatible 22:Optical multiplexer (MUX) and demultiplexer (DEMUX) element 23aOption ID 23bOption ID 23cOption ID 25:Electrical line to control unit 26:Parallel optical signals, e.g. DR4 standard compatible 27:Optionally Multiplexed optical signals or parallel optical signals 28:Optical Adapter element with may be 64 to 64 fibers 30:Optical switch element which is software configurable between: - parallel option - multiplexer (MUX) and demultiplexer (DEMUX) option - other optical switch options - attenuation option 31:Control unit with software control functions 32:Control signal 33a-c:External fiber interfaces

[0042] Figure 1 shows an exemplary embodiment of an optical assembly that comprises a base module 14. The base module 14 is - because of its characteristics - referred to hereinafter as network switch assembly 14. The network switch assembly 14 is configurable by a pluggable optical input-output module 5 and a pluggable laser module 1.

[0043] The network switch assembly 14 comprises a subunit 2 having a switch ASIC 10, sixteen transceiver modules 100, a high-speed substrate 11 and fiber bundles.

[0044] Each of the transceiver modules 100 are connected via a first fiber bundle 3 to a first pluggable interface 7a of the network switch assembly 14, and via a second fiber bundle 4 to a second pluggable interface 7b of the network switch assembly 14.

[0045] The pluggable laser module 1 comprises an electrical and optical interface 6a that may be plugged into a laser module cage that is provided with the first pluggable interface 7a of the network switch assembly 14 and may therefore get connected to one of the transceiver modules 100. The laser module 1 may be plugged through a front plate 8 of the network switch assembly 14.

[0046] The pluggable input-output module 5 comprises an internal electrical and optical interface 6b that may be plugged in an input-output module cage that is provided with the second pluggable interface 7b of the network switch assembly 14 and may therefore get connected to one of the transceiver modules 100.

[0047] Furthermore, the pluggable input-output module 5 comprises a second, external optical interface 33. The external optical interface 33 is connected to the internal electrical and optical interface 6b of the pluggable input-output module 5 via fiber bundles 9.

[0048] The input-output module 5 may be plugged through the front plate 8 of the network switch assembly 14.

[0049] A control unit 12 of the network switch assembly 14 may be electrical connected to the laser module 1 via the interfaces 6a and 7a, to the input-output module 5 via the interfaces 6b and 7b, to a control interface 13 in the front plate 8, and to the subunit 2.

[0050] Figure 2 shows the exemplary network switch assembly 14 of Figure 1 after it has been configured with two plugged-in optical input-output modules 5 and two plugged-in laser modules 1.

[0051] Figure 3 shows the front view of the front plate 8 of the exemplary network switch assembly 14 of Figures 1 and 2.

[0052] Sixteen laser module cages with interfaces 7a are seen in the top line of the front plate 8. A laser module 1 may plugged in each of the interfaces 7a.

[0053] Sixteen input-output module cages with the internal interfaces 7b are seen in the bottom line of the front plate 8. An input-output module 5 may plugged in each of the interfaces 7b. The front plate 8 comprises also a control interface 13.

[0054] Figure 4 shows exemplary embodiments of the invention where different types of laser modules 1a, 1b and 1c may be plugged in the laser module cage to configure the network switch assembly 2.

[0055] The laser module type 1a is a 4 wavelengths (λ) laser module comprising: eight laser diodes, two laser diodes per λ a temperature control element one fiber coupling element per laser diode an optical power control a module option ID.

[0056] The laser module type 1a may support a so-called multiplexed option with four channels with different wavelengths in a single fiber.

[0057] The laser module type 1b is a single wavelength laser module comprising: eight laser diodes all with the same wavelength a temperature control element one fiber coupling element per laser diode optical power controls module option ID.

[0058] The laser module type 1b supports a so-called parallel option with one fiber per channel.

[0059] The laser module type 1c is a multi-optional laser module comprising: eight laser diodes with tuneable wavelengths temperature control elements one fiber coupling element per laser diode optical power controls module option ID.

[0060] The laser module type 1c may support parallel as well as multiplexed options with different wavelengths and wavelengths grids.

[0061] Figure 5 shows exemplary embodiments of the invention where different types of input-output modules 5a, 5b and 5c may be plugged in the front plate to configure the network switch assembly.

[0062] The input-output module type 5a comprises: an optical multiplexer (MUX) and demultiplexer (DEMUX) elements 22 an option ID element 23a fiber bundles 9a connecting the input-output module to the external interface 33a comprising eight duplex connectors with two fibers each. The connectors may be LC connectors.

[0063] The input-output module type 5a may support a so-called multiplexed option with four channels with different wavelengths in a single fiber. The optical signals 20 are multiplexed optical signals, which may support FR4 (IEEE) standard.

[0064] The input-output module type 5b comprises: an optical adapter element 28 which guides the fiber bundle 9b directly to the interface of the input-output module 6b an option ID element 23b fiber bundles 9b connecting the input-output module to the external interface 33b comprising eight connectors with eight fibers each. The connectors may be MPO connectors.

[0065] The input-output module type 5b may support a so-called parallel option, where the light of any channel is guided in a separate fiber. The optical signals 26 are parallel optical signals, which may support DR4 (IEEE) standard.

[0066] The input-output module type 5c comprises: an optical switch element 30 which is software configurable between: ∘ parallel option ∘ multiplexer (MUX) and demultiplexer (DEMUX) options ∘ other optical switch options ∘ attenuation options an option ID element 23c fiber bundles 9c connecting the input-output module to the external interface 33c.

[0067] The input-output module type 5c may support different options with different fiber configurations. The optical signals 27 may be multiplexed optical signals or parallel optical signals depending on the software-selected option that may be controlled by a control signal 32 via control interface 13 and the control unit 31 (figure 2).

[0068] Figure 6 shows exemplary embodiments of the invention where the pluggable input-output module 5 comprises eight fiber bundles 9 and eight connectors forming the external fiber interface 33.

[0069] The above described laser modules type 1a, 1b and 1c as well as the input-output modules type 5a, 5b and 5c may form components of a set of optical components for fabricating an optical assembly according to present invention, for instance as described above.

[0070] Each of the laser modules type 1a, 1b and 1c is individually assigned to one of the input-output module types 5a, 5b and 5c, and vice versa, for instance according to the following assignment scheme: Pair 1: laser module type 1a in combination with input-output module type 5a. Pair 1 are identified by an identification ID1. Pair 2: laser module type 1b in combination with input-output module type 5b. Pair 2 are identified by an identification ID2. Pair 3: laser module type 1a in combination with input-output module type 5. Pair 3 are identified by an identification ID3.

[0071] In other words, laser modules carry or transmit type-related identification ID1, ID2 or ID3 that identifies their respective type of laser module. The input-output modules carry or transmit type-related identification that identifies their respective type of input-output module.

[0072] A control unit implemented in the base module reads the type-related identification ID1-ID3 of plugged-in laser modules and plugged-in input-output modules. The control unit controls whether the type of laser module that is plugged into on of the first pluggable interfaces of the base module, and the type of input-output module that is plugged into the corresponding (optically connected) second pluggable interface, corresponds with the above assignment scheme. The control unit generates an alarm signal if the predefined assignment scheme is violated.

[0073] The exemplary embodiments of the present invention described above and / or of other embodiments of the present invention may have one or more of the following features and / or advantages: In exemplary embodiments of the invention the basic module may comprise a high bandwidth switch ASIC. A switch ASIC and an optical transceiver assembly may be placed on one high-speed substrate so that the electrical connections may be very short for minimum signal distortion. In exemplary embodiments of the invention the basic module may comprise one or more switch ASICs with an accumulated bandwidth of 51 Tb / s or higher. The bandwidth of a single channel may be 100Gb / s or higher. In exemplary embodiments of the invention the basic module may comprise 16 transceiver modules which are co-packaged with the switch ASIC on the same high-speed substrate. The bandwidth of a single transceiver module may be 3.2 Tb / s or higher. The bandwidth of a single channel of a transceiver module may be 100Gb / s or higher. In exemplary embodiments of the invention the transceiver modules may be soldered on the high-speed substrate. Alternatively, the transceiver modules may be placed on a second substrate which are soldered or pluggably mounted on the high-speed substrate. In exemplary embodiments of the invention the fibers in the fiber bundle which connects the transceiver module with the optical input-output module may be in a parallel arrangement, meaning all of the channels are coupled in different fibers. In exemplary embodiments of the invention 16 optical transceiver modules contain 16 fiber connectors, respectively. Each optical connector on the transceiver module may contain preferable 72 fibers splitted in two separate fiber bundles. 32 receiver fibers and 32 transmitter fibers may connect the transceiver module to the optical input-output module in the second fiber bundle and eight fibers may connect the laser module to the transceiver module in the first fiber bundle. In exemplary embodiments of the invention the aggregated fiber count of the basic module may be 1152 fibers. Exemplary embodiments of the invention may comprise polarization maintaining fibers in the first fiber bundle from the laser module to the transceiver module. In exemplary embodiments of the invention the input-output module 5a may comprise multiple arrangements of optical multiplexers (e.g. 4:1 multiplexers) and optical demultiplexers (e.g. 1:4 demultiplexers). In the latter case, each pluggable optical input-output module may comprise eight such multiplexers as well as demultiplexers guiding the light in eight fiber bundles terminated with eight optical connectors as the external interface of the input-output module. Each of the optical connectors may be terminated with a standard duplex LC connector that comprises a pair of one Tx and one Rx fibers. The signal light passing this connector may support multiplex standards, like IEEE 400GBASE-FR4. To configure a multiplex option of the network switch assembly 14, the input-output module type 5a may be combined with the laser module type 1a. To configure a parallel option of the network switch assembly 14, the input-output module type 5b may be combined with the laser module type 1b. To configure a multiple option of the network switch assembly 14, the input-output module type 5c may be combined with the laser module type 1c. In exemplary embodiments of the invention the input-output module 5a may comprise an optical adapter element 28. In such an arrangement, 64 fibers guiding the light directly from the internal pluggable interface of the input-output module via eight fiber bundles may be terminated with eight optical connectors as the external interface of the input-output module. Each of the optical connectors may be formed by a standard MPO connector that terminates eight fibers (four Tx and four Rx fibers). The signal light passing this connector may support parallel (one fiber per channel) standards, like IEEE 400GBASE-DR4. In exemplary embodiments of the invention the input-output modules and the laser modules may be standard form factors often used in network switch assemblies, like QSFP-DD or OSFP pluggable modules. Exemplary embodiments of the invention comprise a control unit 12 that is electrically connected to the laser module 1, to the input-output module 5, to a control interface 13 in the front plate 8 and to the basic module 2. The control unit reads out the status of the pluggable modules and the basic module and furthermore may control via software the characteristics of the pluggable modules as well as the basic module. In exemplary embodiments of the invention the following characteristics of the laser module may be set via software: ∘ laser optical power: this defines the reach of the optical data link (e.g. 500m, 2km, etc.) and adopt the laser module power consumption. ∘ the wavelength of the laser diodes. ∘ the wavelength grid. ∘ the spectrum of the laser light. In exemplary embodiments of the invention the following characteristics of the input-output module may be set via software: ∘ switching between parallel option and multiplexer (MUX) and demultiplexer (DEMUX) options ∘ other optical switch functionalities ∘ attenuation options. Exemplary embodiments of the invention may combine the functionalities and interfaces of both, the input-output module and the laser module, in a single pluggable module. Different types of such pluggable modules then configure the basic module. Exemplary embodiments of the invention may comprise laser module types, which supports different type of modulators and technologies in the transceiver modules. Exemplary embodiments of the invention may comprise laser modules with comb laser diodes. The output light from such modules may spectrally shaped as a comb. In exemplary embodiments of the invention the characteristics of the network switch assembly may be set from outside via the control interface to the requirements of the optical network. Such characteristics may be the optical output power or optical modulation amplitude, the receiver input power, wavelengths, the wavelengths' grid, power consumption of the network switch assembly, etc. In exemplary embodiments of the invention the network switch assembly comprises a one rack unit (1RU) front plate with at least one row of slots for pluggable laser modules and input-output modules, respectively, that may be either manually configured or through a management interface utilizing tunable versions of the pluggable modules. In exemplary embodiments of the invention the system may be configured to support either parallel fiber or multiplexed transmission and fiber link lengths from 10cm to 2km.

[0074] The various embodiments and aspects of embodiments of the invention disclosed herein are to be understood not only in the order and context specifically described in this specification, but to include any order and any combination thereof. Whenever the context requires, all words used in the singular number shall be deemed to include the plural and vice versa. Whenever the context requires, all options that are listed with the word "and" shall be deemed to include the word "or" and vice versa, and any combination thereof. The term "pluggably" is inter alia used to express that something is done, for instance coupled or connected, in a pluggable fashion.

[0075] In the drawings and specification, there have been disclosed a plurality of embodiments of the present invention. The applicant would like to emphasize that each feature of each embodiment may be combined with or added to any other of the embodiments to modify the respective embodiment and create additional embodiments. These additional embodiments form a part of the present disclosure and, therefore, the applicant may file further patent claims regarding these additional embodiments at a later stage of the prosecution.

Claims

1. Method of fabricating an optical assembly on the basis of a set of optical components, said set of optical components comprising - a set of laser modules (1) that comprises at least twc different types of laser modules (1a, 1b, 1c), each of the laser modules having a pluggable interface (6a), - a set of input-output modules (5) that comprises at least twc different types of input-output modules (5a, 5b), each of the input-output modules having a pluggable interface (6b), - a base module (14) having a first pluggable interface (7a) that is pluggable to the pluggable interface (6a) of each of the laser modules (1) of said set of laser modules (1), a second pluggable interface (7b) that is pluggable to the pluggable interface (6b) of each of the input-output modules (5) of said set of input-output modules (5), and a transceiver (100) located between the first (7a) and second pluggable interface (7b), - wherein each of the laser modules (1) is individually assigned to one or more of the input-output modules (5) and each of the input-output modules (5) is individually assigned to one or more of the laser modules (1) according to a predefined assignment scheme, - wherein the laser modules (1) carry or transmit type-related identification that identifies their respective type of laser module (1a, 1b, 1c), - wherein the input-output modules (5) carry or transmit type-related identification that identifies their respective type of input-output module (5a, 5b), - wherein a control unit (12) implemented in the base module (14) is configured to read the type-related identification of plugged-in laser modules (1) and plugged-in input-output modules (5), - wherein the control unit (12) is configured to control whether the type of laser module (1a, 1b, 1c) plugged into the first pluggable 5 interface (7a) of the base module (14) and the type of input-output module (5a, 5b) plugged into the second pluggable interface (7b) correspond with the predefined assignment scheme, and - wherein the control unit (12) is configured to generate an alarm signal if the predefined assignment scheme is violated, said method comprising the steps of - selecting a laser module (1) from said set of at least twc laser modules (1), - plugging the pluggable interface (6a) of the selected laser module (1) into the first pluggable interface (7a) of the base module (14), - selecting an input-output module (5) from said set of at least two input-output modules (5), and - plugging the pluggable interface (6b) of the selected input-output module (5) into the second pluggable interface (7b) of the base module (14), - wherein said control unit (12) implemented in the base module (14) carries out the steps of - reading the type-related identification of the plugged-in laser module (1) and the type-related identification of the plugged-in input-output module (5), - controlling whether the type of laser module (1a, 1b, 1c) plugged into the first pluggable interface (7a) of the base module (14) and the type of input-output module (5a, 5b) plugged into the second pluggable interface (7b) correspond with the predefined assignment scheme, and - generating an alarm signal if the predefined assignment scheme is violated.

2. Method of claim 1, wherein one type of input-output module comprises optical multiplexer elements and / or optical demultiplexer elements for an optical output signal and an optical input signal, respectively, and wherein another type of input-output module comprises only fibers, which guide light directly from an internal optical interface to an external optical interface and vice versa.

3. Method of any of the preceding claims, wherein said set of laser modules comprises at least two of the following types of laser modules: a four wavelengths laser module comprising eight laser diodes, two laser diodes per wavelength and one fiber coupling element per laser diode, wherein this laser module type supports a so-called multiplexed option with four channels with different wavelengths in a single fiber at an external optical interface of an input-output module; a single wavelength laser module comprising eight laser diodes all with the same wavelength and one fiber coupling element per laser diode, wherein the latter laser module type supports a so-called parallel option with one fiber per channel at an external optical interface of an input-output module; a multi-optional laser module comprising eight laser diodes with tuneable wavelengths and one fiber coupling element per laser diode wherein the latter laser module type supports parallel as well as multiplexed options at an external optical interface of an input-output module with different wavelengths and wavelengths grids.

4. Set of optical components for fabricating an optical assembly comprising - a set of laser modules (1) that comprises at least twc different types of laser modules (1a, 1b, 1c), each of the laser modules having a pluggable interface (6a), - a set of input-output modules (5) that comprises at least twc different types of input-output modules (5a, 5b), each of the input-output modules (5) having a pluggable interface (6b), - a base module (14) having a first pluggable interface (7a) that is pluggable to the pluggable interface (6a) of each of the laser modules (1) of said set of laser modules (1), a second pluggable interface (7b) that is pluggable to the pluggable interface (6b) of each of the input-output modules (5) of said set of input-output modules (5), and a transceiver (100) located between the first (7a) and second pluggable interface (7b), - wherein each of the laser modules (1) is individually assigned to one or more of the input-output modules (5) and each of the input-output modules (5) is individually assigned to one or more of the laser modules (1) according to a predefined assignment scheme, - wherein the laser modules (1) carry or transmit type-related identification that identifies their respective type of laser module (1a, 1b, 1c), - wherein the input-output modules (5) carry or transmit type-related identification that identifies their respective type of input-output module (5a, 5b), - wherein a control unit (12) implemented in the base module (14) is configured to read the type-related identification of plugged-in laser modules (1) and plugged-in input-output modules (5), - wherein the control unit (12) is configured to control whether the type of laser module (1a, 1b, 1c) plugged into the first pluggable interface (7a) of the base module (14) and the type of input-output module (5a, 5b) plugged into the second pluggable interface (7b) correspond with the predefined assignment scheme, and - wherein the control unit (12) is configured to generate an alarm signal if the predefined assignment scheme is violated.

5. Set of claim 4, wherein one type of input-output module comprises optical multiplexer elements and / or optical demultiplexer elements for an optical output signal and an optical input signal, respectively, and wherein another type of input-output module comprises only fibers, which guide light directly from an internal optical interface to an external optical interface and vice versa.

6. Set of claims 4 or 5, wherein said set of laser modules comprises at least two of the following types of laser modules: a four wavelengths laser module comprising eight laser diodes, two laser diodes per wavelength and one fiber coupling element per laser diode, wherein this laser module type supports a so-called multiplexed option with four channels with different wavelengths in a single fiber at an external optical interface of an input-output module; a single wavelength laser module comprising eight laser diodes all with the same wavelength and one fiber coupling element per laser diode, wherein the latter laser module type supports a so-called parallel option with one fiber per channel at an external optical interface of an input-output module; a multi-optional laser module comprising eight laser diodes with tuneable wavelengths and one fiber coupling element per laser diode wherein the latter laser module type supports parallel as well as multiplexed options at an external optical interface of an input-output module with different wavelengths and wavelengths grids.